Tokyo Institute of Technology Volcanic Fluid Research Center, Joint-Use Facilities Volcanic Fluid Resarch Center   Associate Professor,Others

Geochemical society

International Association of volcanology and chemistry of the earth's interior

American Geophysical Union

American Geophysical Union

Geochemical society

Principal component analysis for the elemental composition of sedimentary sands in the Hayakawa River of Hakone Caldera, Japan

Nozomi NUMANAMI, Takeshi OHBA, Muga YAGUCHI

GEOCHEMICAL JOURNAL   2024

Correlation between volcanic gas composition and earthquake frequency at Kusatsu-Shirane volcano, Japan

Ohba T., Yaguchi M., Numanami N., Toyoshima S., Terada A.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2024   89 - 89   2024

Magma-hydrothermal system of Kusatsu-Shirane volcano, Japan

A Terada, W Kanda, Y Ogawa, T Yamada, M Yamamoto, H Aoyama, T Ohkura, T Ohba, M Yaguchi, H Sumino, T Obase

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2023   68 - 68   2023

Temporal Variation in Volcanic Gas Composition at Kusatsu-Shirane Volcano

Ohba T., Yaguchi M., Numanami N., Toyoshima S., Yasuda Y., Terada A.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2023   57 - 57   2023

Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases Reviewed International journal

Tomoya Obase, Hirochika Sumino, Kotaro Toyama, Kaori Kawana, Kohei Yamane, Muga Yaguchi, Akihiko Terada, Takeshi Ohba

Scientific Reports   12 ( 1 )   17967 - 17967   2022.11

Major ions, trace elements and stable isotope characteristics of shallow groundwater in the Bonaberi district, Douala, Cameroon Reviewed

Brice Tchakam Kamtchueng, Aicha Foupouagnigni, Mero Yannah, Josephine Ndjama, Mumbfu Ernestine Mimba, Mengnjo Jude Wirmvem, Muga Yaguchi, Gloria Eneke Takem, Andrew Ako Ako, Wilson Yetoh Fantong, Emmanuel Ngnikam, Takeshi Ohba

Sustainable Water Resources Management   8 ( 5 )   2022.10

A Depression Containing CO2-Enriched Water at the Bottom of Lake Monoun, Cameroon, and Implications for the 1984 Limnic Eruption Reviewed

Takeshi Ohba, Yu Oginuma, Kazuto Saiki, Minoru Kusakabe, Issa, Takounjou A. Fouepe, Romaric Ntchantcho, Gregory Tanyileke, Joseph V. Hell

Frontiers in Earth Science   10   2022.5

Volcanic Ash from the June 17, 1962 Eruption of Yakedake Volcano: Stereomicroscopic, XRD, and Water-Soluble Components Analyses Reviewed

Muga Yaguchi, Takeshi Ohba, Yasuo Hirayama, Nozomi Numanami

Journal of Disaster Research   17 ( 2 )   257 - 262   2022.2

Quantitative Assessment of Temporal Changes in Subaqueous Hydrothermal Activity in Active Crater Lakes During Unrest Based on a Time-Series of Lake Water Chemistry Reviewed International journal

Akihiko Terada, Muga Yaguchi, Takeshi Ohba

Frontiers in Earth Science   9   :740671   2022.1

Special issue "Understanding phreatic eruptions - recent observations of Kusatsu-Shirane volcano and equivalents-" Reviewed

Ogawa, Yasuo, Ohba, Takeshi, Fischer, Tobias P., Yamamoto, Mare, Jolly, Art

Earth, Planets and Space   74 ( 1 )   2022

Spatial distribution of Helium and Carbon isotope ratios in soil gas outside the Yugama crater at Kusatsu-Shirane volcano: The source of the soil gas

K. Wakamatsu,, A. Terada,, H. Sumino,, T. Obase,, M. Yaguchi,, T. Ohba,

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2022   50 - 50   2022

Rainwater Quality in Some Urban and Rural Sites of Cameroon (Central Africa)

Aicha Foupouagnigni, Andrew Ako, Jude Mengnjo, Gloria Eneke, Josephine Ndjama, Bertil Nlend, George Nkeng, Takeshi Ohba

Advances in Science, Technology and Innovation   391 - 394   2022

Time variation in hydrothermal circulation at the shallow part of Kusatsu-Shirane volcano inferred from temporal changes in water chemistry

A. Terada,, L. Suzuki,, M. Yaguchi,, T. Ohba,

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2022   73 - 73   2022

Groundwater Interacting at Depth With Hot Plastic Magma Triggers Phreatic Eruptions at Yugama Crater Lake of Kusatsu-Shirane Volcano (Japan) Reviewed

Muga Yaguchi, Takeshi Ohba, Akihiko Terada

Frontiers in Earth Science   9   2021.12

Behavior of magmatic components in fumarolic gases related to the 2018 phreatic eruption at Ebinokogen Ioyama volcano, Kirishima Volcanic Group, Kyushu, Japan Reviewed

Takeshi Ohba, Muga Yaguchi, Urumu Tsunogai, Masanori Ito, Ryo Shingubara

Earth, Planets and Space   73 ( 1 )   2021.12

High–μ signature in lavas of Mt. Oku: Implications for lithospheric and asthenospheric contributions to the magmatism of the Cameroon Volcanic Line (West Africa) Reviewed

A. N.E. Asaah, T. Yokoyama, H. Iwamori, F. T. Aka, T. Kuritani, T. Usui, J. Tamen, M. Gountié Dedzo, B. Chako-Tchamabé, T. Hasegawa, L. A. Nche, T. Ohba

Lithos   400-401   2021.11

Isotopic composition of precipitation and groundwater onshore of the Rio del Rey Basin, southwest Cameroon: local meteoric lines and recharge

Engome R. Wotany, Mengnjo J. Wirmvem, Wilson Y. Fantong, Samuel N. Ayonghe, Mabel N. Wantim, Takeshi Ohba

APPLIED WATER SCIENCE   11 ( 8 )   2021.8

Carbon Dioxide in Lake Nyos, Cameroon, Estimated Quantitatively From Sound Speed Measurements Reviewed

Bertram Boehrer, Kazuto Saiki, Takeshi Ohba, Greg Tanyileke, Dmitri Rouwet, Minoru Kusakabe

Frontiers in Earth Science   9   2021.7

Magnetization of mesenchymal stem cells using magnetic liposomes enhances their retention and immunomodulatory efficacy in mouse inflamed skeletal muscle

Yusuke Kono, Junya Takegaki, Takeshi Ohba, Koji Matsuda, Ryosuke Negoro, Satoshi Fujita, Takuya Fujita

INTERNATIONAL JOURNAL OF PHARMACEUTICS   596   2021.3

Water chemistry of fluid supplied to the Yugama Crater Lake of Kusatsu-Shirane Volcano : Time series analysis of lake water concentrations

L. Suzuki,, A Terada,, M Yaguchi,, T Ohba,

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2021   55 - 55   2021

High-precision Δ′¹⁷O measurements of geothermal H₂O and MORB on the VSMOW-SLAP scale: evidence for active oxygen exchange between the lithosphere and hydrosphere Reviewed

Sambuichi Takashi, Tsunogai Urumu, Kura Kazushige, Nakagawa Fumiko, Ohba Takeshi

GEOCHEMICAL JOURNAL   55 ( 6 )   e25 - e33   2021

Volcanic Activity Forecast Based on Volcanic Gas Composition of Hakone Volcano, Japan: Utilization for Volcanic Disaster Prevention

Yasushi Daita, Takeshi Ohba, Muga Yaguchi, Takao Sogo, Masatake Harada

JOURNAL OF GEOGRAPHY-CHIGAKU ZASSHI   130 ( 6 )   783 - 796   2021

Magma–hydrothermal activitybeneath Yugama Crater Lake atKusatsu-Shirane volcano, based on thelake waterchemistry

Yaguchi Muga, Ohba Takeshi, Terada Akihiko

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2021   54 - 54   2021

Petrology and geochemistry of ignimbrites and associated enclaves from Mount Bambouto, West-Cameroon, Cameroon Volcanic Line

Merlin Gountie Dedzo, Djamilatou Diddi Hamadjoda, Eric Martial Fozing, Boris Chako Tchamabe, Ana Teresa Mendoza-Rosas, Asobo Nkengmatia Elvis Asaah, Ghislain Zangmo Tefogoum, Pierre Kamgang, Takeshi Ohba

GEOCHEMISTRY   80 ( 4 )   2020.12

Temperature and electrical conductivity of water in Lake Nyos transmitted by an automatic observation buoy

Takeshi Ohba, Seigo Ooki, Yu Oginuma, Hajime Yoshida, Romaric Ntchantcho, Andrew Ako, Robert Tawedi, Mevengue Ayissi, Gregory Tanyileke, Joseph Hell

JOURNAL OF AFRICAN EARTH SCIENCES   172   2020.12

Geochemical Behavior of REE in Stream Water and Sediments in the Gold-Bearing Lom Basin, Cameroon: Implications for Provenance and Depositional Environment

Mumbfu Ernestine Mimba, Wirmvem MengnjoJude, Salomon Cesar Nguemhe Fils, Nozomi Numanami, Melvin Tamnta Nforba, Takeshi Ohba, FestusTongwa Aka, Cheo Emmanuel Suh

AQUATIC GEOCHEMISTRY   26 ( 1 )   53 - 70   2020.3

Multi-tracer (delta O-18, delta D, H-3, CFCs and SF6) investigation of groundwater recharge and apparent age at the Bamenda Highlands along the Cameroon volcanic line

Mengnjo Jude Wirmvem, Brice Tchakam Kamtchueng, Engome Regina Wotany, Mumbfu Ernestine Mimba, Wilson Yetoh Fantong, Ako Andrew Ako, Takeshi Ohba

SUSTAINABLE WATER RESOURCES MANAGEMENT   6 ( 1 )   2020.1

New insights into volume estimates and gas contents from the acoustic investigation at Lake Monoun, Cameroon Reviewed

Fouepe Takounjou Alain, Ntchantcho Romaric, Saiki Kazuto, Ohba Takeshi, Kamtchueng Brice, Tanyileke Gregory, Fraleu Benoit, Hell Joseph

JOURNAL OF AFRICAN EARTH SCIENCES   160   2019.12

Secular Variations of Helium and Nitrogen Isotopes Related to the 2015 Volcanic Unrest of Mt. Hakone, Central Japan

T. Kagoshima, Y. Sano, N. Takahata, H. Lee, T. Lan, T. Ohba

Geochemistry, Geophysics, Geosystems   20 ( 11 )   4710 - 4722   2019.11

Time Variation in the Chemical and Isotopic Composition of Volcanic Gas at Mt. Mihara of Izu-Oshima Island, Japan Reviewed

Takeshi Ohba, Muga Yaguchi, Kana Nishino, Nozomi Numanami

Journal of Disaster Research   14 ( 7 )   972 - 977   2019.10

Constituent Mineral and Water-Soluble Components of Volcanic Ash from the 2018 Eruption of Mt. Motoshirane of Kusatsu-Shirane Volcano, Japan

Muga Yaguchi, Takeshi Ohba, Nozomi Numanami, Ryohei Kawaguchi

JOURNAL OF DISASTER RESEARCH   14 ( 7 )   991 - 995   2019.10

Time Variation in the Chemical and Isotopic Composition of Fumarolic Gasses at Kusatsu-Shirane Volcano, Japan Reviewed

Takeshi Ohba, Muga Yaguchi, Kana Nishino, Nozomi Numanami, Urumu Tsunogai, Masanori Ito, Ryo Shingubara

Frontiers in Earth Science   7   2019.9

Eruption history and petrogenesis of rocks from Nyos volcano (NW Cameroon): Evidence from lithostratigraphy and geochemistry Reviewed

Takeshi Hasegawa, Festus Tongwa Aka, Yasuo Miyabuchi, Linus Anye Nche, Tetsuo Kobayashi, Katsuya Kaneko, Asobo Nkengmatia, Elvis Asaah, Boniface Kankeu, Issa, Takeshi Ohba, Minoru Kusakabe, Joseph Victor Hell

Journal of Volcanology and Geothermal Research   378   51 - 71   2019.6

The nature and source of the volcanic ash during the 2015 small phreatic eruption at Hakone volcano, central Japan Reviewed International journal

Muga Yaguchi, Takeshi Ohba, Masakazu Sago

Geochemical Journal   53 ( 3 )   209 - 217   2019.5

Petrology and geochemistry of lavas from Gawar, Minawao and Zamay volcanoes of the northern segment of the Cameroon volcanic line (Central Africa): Constraints on mantle source and geochemical evolution

Merlin Gountie Dedzo, Asobo Nkengmatia Elvis Asaah, Eric Martial Fozing, Boris Chako Tchamabe, Ghislain Tefogoum Zangmo, Nguihdama Dagwai, Dieudonne Tchokona Seuwui, Pierre Kamgang, Festus Tongwa Aka, Takeshi Ohba

JOURNAL OF AFRICAN EARTH SCIENCES   153   31 - 41   2019.5

Time variations in the chemical and isotopic composition of fumarolic gases at Hakone volcano, Honshu Island, Japan, over the earthquake swarm and eruption in 2015, interpreted by magma sealing model Reviewed

Ohba Takeshi, Yaguchi Muga, Nishino Kana, Numanami Nozomi, Daita Yasushi, Sukigara Chiho, Ito Masanori, Tsunogai Urumu

EARTH PLANETS AND SPACE   71 ( 1 )   2019.4

Environmental modifications of Lake Nyos surface water by artificial degassing

Katsuro Anazawa, Wilson Y. Fantong, Akira Ueda, Akiko Ozawa, Minoru Kusakabe, Yutaka Yoshida, Takeshi Ohba

JOURNAL OF AFRICAN EARTH SCIENCES   152   115 - 121   2019.4

Vertical change in transparency of water at Lake Nyos, a possible indicator for the depth of chemocline

Kazuto Saiki, Katsuya Kaneko, Takeshi Ohba, Romaric Ntchantcho, Main Fouepe, Minoru Kusakabe, Gregory Tanyileke, Joseph Hell

JOURNAL OF AFRICAN EARTH SCIENCES   152   122 - 127   2019.4

Major ions, delta O-18, delta C-13 and Sr-87/Sr-86 compositions of water and precipitates from springs along the Cameroon volcanic line (Cameroon, west Africa): Implications for provenance and volcanic hazards

Wilson Yetoh Fantong, Brice Tchakam Kamtchueng, Yasuo Ishizaki, Ernest Chi Fru, Emilia Bi Fantong, Mengnjo Jude Wirmvem, Festus Tongwa Aka, Bertil Nlend, Didier Harman, Akira Ueda, Minoru Kusakabe, Gregory Tanyileke, Takeshi Ohba

JOURNAL OF AFRICAN EARTH SCIENCES   150   12 - 22   2019.2

Enrichment of ferrous iron in the bottom water of Lake Nyos

Minoru Kusakabe, Rosine E. Tiodjio, Bruce Christenson, Kazuto Saiki, Takeshi Ohba, Muga Yaguchi

JOURNAL OF AFRICAN EARTH SCIENCES   150   37 - 46   2019.2

Variations in thermal state revealed by the geochemistry of fumarolic gases and hot-spring waters of the Tateyama volcanic hydrothermal system, Japan Reviewed

Seki K, Ohba T, Aoyama S, Ueno Y, Kanda W, Sumino H, Yaguchi M, Tanbo T

Bulletin of Volcanology   81 ( 2 )   8   2019.1

Enhanced macrophage delivery to the colon using magnetic lipoplexes with a magnetic field

Yusuke Kono, Serika Gogatsubo, Takeshi Ohba, Takuya Fujita

DRUG DELIVERY   26 ( 1 )   935 - 943   2019

Volcanic gas composition as geochemical indicator during volcanic unrest at Kusatsu Shirane volcano

Kazahaya Ryunosuke, Kitagawa Takahiro, Ohba Takeshi, Yaguchi Muga, Terada Akihiko, Kanda Wataru

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2019   75 - 75   2019

Chemical composition of lake water in Yugama crater at Kusatsu-Shirane volcano and its changes in response to volcanic activity

Yaguchi Muga, Ohba Takeshi, Terada Akihiko

Abstracts of Annual Meeting of the Geochemical Society of Japan   66   118   2019

Magma-Hydrothermal activity beneath Kusatsu-Shirane volcano inferred from the chemical composition of lake water at Yugama crater

Yaguchi Muga, Ohba Takeshi, Terada Akihiko

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2019   200 - 200   2019

Chemical compositions of parental fluids beneath Kusatsu-Shirane volcano

Katori A., Terada A., Nishino K., Numanami N., Ohba T., Yaguchi M.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2019   199 - 199   2019

Measurements of volcanic gas emitted from the bottom of the pit crater at Miharayama, Izu-Oshima volcano

Terada A., Mori T., Ohba T., Muga Y., Onizawa S., Morita Y.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2019   78 - 78   2019

Regional geochemical baseline concentration of potentially toxic trace metals in the mineralized Lom Basin, East Cameroon: a tool for contamination assessment International journal

Mumbfu Ernestine Mimba, Takeshi Ohba, Salomon Cesar Nguemhe Fils, Melvin Tamnta Nforba, Nozomi Numanami, Tasin Godlove Bafon, Festus Tongwa Aka, Cheo Emmanuel Suh

GEOCHEMICAL TRANSACTIONS   19 ( 1 )   11 - 11   2018.5

Upper Triassic mafic dykes of Lake Nyos, Cameroon (West Africa) I: K-Ar age evidence within the context of Cameroon Line magmatism, and the tectonic significance Reviewed

Aka Festus Tongwa, Hasegawa Takeshi, Nche Linus Anye, Asaah Asobo Nkengmatia Elvis, Mimba Mumbfu Ernestine, Teitchou Isidore, Ngwa Caroline, Miyabuchi Yasuo, Kobayashi Tetsuo, Kankeu Boniface, Yokoyama Tetsuya, Tanyileke Gregory, Ohba Takeshi, Hell Joseph Victor, Kusakabe Minoru

JOURNAL OF AFRICAN EARTH SCIENCES   141   49 - 59   2018.5

Water sampling using a drone at Yugama crater lake, Kusatsu‑Shirane volcano, Japan Reviewed

Terada A, Morita Y, Hashimoto T, Mori T, Ohba T, Yaguchi M, Kanda W

Earth Planets Space   70   64   2018.4

A shallow hydrothermal system at the Shirane pyroclastic cone at Kusatsu-Shirane volcano

Katori A., Terada A., Nishino K., Numanami N., Ohba T.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2018   63 - 63   2018

Seasonal Hydrological Inputs of Major Ions and Trace Metal Composition in Streams Draining the Mineralized Lom Basin, East Cameroon: Basis for Environmental Studies

Mumbfu Ernestine Mimba, Takeshi Ohba, Salomon Cesar Nguemhe Fils, Mengnjo Jude Wirmvem, Nozomi Numanami, Festus Tongwa Aka

EARTH SYSTEMS AND ENVIRONMENT   1 ( 2 )   2017.11

Variation in stable isotope ratios of monthly rainfall in the Douala and Yaounde cities, Cameroon: local meteoric lines and relationship to regional precipitation cycle

Mengnjo Jude Wirmvem, Takeshi Ohba, Brice Tchakam Kamtchueng, Eldred Tunde Taylor, Wilson Yetoh Fantong, Ako Andrew Ako

APPLIED WATER SCIENCE   7 ( 5 )   2343 - 2356   2017.9

Numerical assessment of the potential for future limnic eruptions at lakes Nyos and Monoun, Cameroon, based on regular monitoring data Reviewed

T. Kozono., M. Kusakabe, Y. Yoshida, R. Ntchantcho, T. Ohba, G. Tanyileke, J. V. Hell

Geological Society, London, Special Publication   437 ( 1 )   163 - 175   2017.7

Effect of diffuse recharge and wastewater on groundwater contamination in Douala, Cameroon Reviewed

Mengnjo Jude Wirmvem, Takeshi Ohba, Linus Anye Nche, Brice Tchakam Kamtchueng, Wiylahnyuy Edith Kongnso, Mumbfu Ernestine Mimba, Tasin Godlove Bafon, Muga Yaguchi, Gloria Eneke Takem, Wilson Yetoh Fantong, Ako Andrew Ako

ENVIRONMENTAL EARTH SCIENCES   76 ( 9 )   2017.5

Disaster prevention, disaster preparedness and local community resilience within the context of disaster risk management in Cameroon

Festus Tongwa Aka, Gaston Wung Buh, Wilson Yatoh Fantong, Issa, Isabella Tem Zouh, Serges Laurent Bopda Djomou, Richard Tanwi Ghogomu, Terry Gibson, Mary-Ann del Marmol, Luc Nkamdjou Sigha, Takeshi Ohba, Minoru Kusakabe, Yutaka Yoshida, Gregory Tanyileke, Joseph Metuk Nnange, Joseph Victor Hell

NATURAL HAZARDS   86 ( 1 )   57 - 88   2017.3

Shallow groundwater recharge mechanism and apparent age in the Ndop plain, northwest Cameroon

Mengnjo Jude Wirmvem, Mumbfu Ernestine Mimba, Brice Tchakam Kamtchueng, Engome Regina Wotany, Tasin Godlove Bafon, Asobo Nkengmatia Elvis Asaah, Wilson Yetoh Fantong, Samuel Ndonwi Ayonghe, Takeshi Ohba

APPLIED WATER SCIENCE   7 ( 1 )   489 - 502   2017.3

Evaluation of volcanic activity based on fumarolic gas observation

OHBA Takeshi, Yaguchi Muga, Daita Yasushi

Abstracts of Annual Meeting of the Geochemical Society of Japan   64   141 - 141   2017

Decreasing removal rate of the dissolved CO2 in Lake Nyos, Cameroon, after the installation of additional degassing pipes Reviewed

Ohba, T, Ooki, S, Oginuma, Y, Kusakabe, M, Yoshida, Y, Ueda, A, Anazawa, K, Saiki, K, Kaneko, K, Miyabuchi, Y, Issa, Aka, F.T, Fantong, W, Ako, A, Tanyileke, G, Hell, J.V

Geological Society Special Publication   437 ( 1 )   177 - 184   2017

Vertical distribution of dissolved CO2 in lakes Nyos and Monoun (Cameroon) as estimated by sound speed in water Reviewed

Kazuto Saiki, Katsuya Kaneko, Takeshi Ohba, Mitsuhisa Sanemasa, Minoru Kusakabe, Romaric Ntchantcho, Alain Fouepe, Gregory Tanyileke, Joseph V. Hell

Geological Society Special Publication   437 ( 1 )   185 - 192   2017

A new method to determine dissolved CO2 concentration of lakes Nyos and Monoun using the sound speed and electrical conductivity of lake water Reviewed

Mitsuhisa Sanemasa, Kazuto Saiki, Katsuya Kaneko, Takeshi Ohba, Minoru Kusakabe, Romaric Ntchantcho, Alain Fouepe, Gregory Tanyileke, Joseph V. Hell

Geological Society Special Publication   437 ( 1 )   193 - 203   2017

Real Time Sensing of (CO2)-C-12 and (CO2)-C-13 Using 2 mu m DFB-LD

Kanto Amamoto, Kazuyoku Tei, Shigeru Yamaguchi, Shunichi Sakai, Masaki Asobe, Takeshi Ohba

2017 22ND MICROOPTICS CONFERENCE (MOC)   210 - 211   2017

Rate of siderite precipitation in Lake Nyos, Cameroon

Akiko Ozawa, Akira Ueda, Wilson Y. Fantong, Katsuro Anazawa, Yutaka Yoshida, Minoru Kusakabe, Takeshi Ohba, Greg Tanyileke, Joseph V. Hell

Geological Society Special Publication   437 ( 1 )   213 - 222   2017

Decreasing capability of the degassing systems at lakes Nyos and Monoun (Cameroon): A new gas removal system applied to Lake Monoun to prevent a future limnic eruption

Yutaka Yoshida, Minoru Kusakabe, Issa, Takeshi Ohba, Gregory Tanyileke, Joseph Victor Hell

Geological Society Special Publication   437 ( 1 )   205 - 212   2017

Chemical and stable isotopic composition of thermal waters around Mt. Iwoyama of Kirishima volcanic complex, and their changes associated with volcanic activity

Yaguchi Muga, Ohba Takeshi, Takagi Akimichi, Kokubo Norio, Mitsunaga Daisuke, Inaba Hiroaki, Yamabe Minori, Ikegame Takamitsu, Kouno Taisuke, Koeda Tomoyuki, Hayashi Mikita, Watanabe Shigeru, Koda Masayasu, Yamamoto Kousei, Mori Takehiko, Sumino Hirochika, Kawana Kaori, Akiyama Yoshihide

Abstracts of Annual Meeting of the Geochemical Society of Japan   64   31 - 31   2017

Evaluation of sampling methods for sulfur speciation in volcanic gases

Sangchul Lee, Takeshi Ohba, Sung Hyo Yun, Kyounghee Yang, Hoon Young Jeong

CHEMICAL GEOLOGY   438   123 - 133   2016.11

Resistivity structure and geochemistry of the Jigokudani Valley hydrothermal system, Mt. Tateyama, Japan Reviewed

Kaori Seki, Wataru Kanda, Toshiya Tanbo, Takeshi Ohba, Yasuo Ogawa, Shinichi Takakura, Kenji Nogami, Masashi Ushioda, Atsushi Suzuki, Zenshiro Saito, Yasuo Matsunaga

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   325   15 - 26   2016.10

Hydrogeochemistry and quality of surface water and groundwater in the vicinity of Lake Monoun, West Cameroon: approach from multivariate statistical analysis and stable isotopic characterization International journal

Brice T. Kamtchueng, Wilson Y. Fantong, Mengnjo J. Wirmvem, Rosine E. Tiodjio, Alain F. Takounjou, Jules R. Ndam Ngoupayou, Minoru Kusakabe, Jing Zhang, Takeshi Ohba, Gregory Tanyileke, Joseph V. Hell, Akira Ueda

ENVIRONMENTAL MONITORING AND ASSESSMENT   188 ( 9 )   524 - 524   2016.9

Vertical distribution of bacteria and archaea in a CO2-rich meromictic lake: A case study of Lake Monoun

Rosine E. Tiodjio, Akihiro Sakatoku, Issa, Wilson Y. Fantong, Kamtchueng B. Tchakam, Gregory Tanyileke, Victor J. Hell, Takeshi Ohba, Minoru Kusakabe, Daisuke Tanaka, Shogo Nakamura, Akira Ueda

LIMNOLOGICA   60   6 - 19   2016.9

Origin of volcanic ash discharged from Owakudani fumarolic area of Hakone volcano on June 30, 2015

Yaguchi Muga, Ohba Takeshi, Sago Masakazu, Sekimoto Asako

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2016   185 - 185   2016

Chemical composition and stable isotope ratio of the fumarolic gases at Iwoyama volcano of Ebino-kougen, Kirishima, Japan

OHBA Takeshi, YAGUCHI Muga

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2016   59 - 59   2016

Variation of hydrogeochemical characteristics of water in surface flows, shallow wells, and boreholes in the coastal city of Douala (Cameroon)

Wilson Y. Fantong, Brice T. Kamtchueng, Beatrice Ketchemen-Tandia, Doris Kuitcha, Josephine Ndjama, Alain T. Fouepe, Gloria E. Takem, Issa, Mengnjo J. Wirmvem, Serges L. Bopda Djomou, Andrew A. Ako, George E. Nkeng, Minoru Kusakabe, Takeshi Ohba

HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES   61 ( 16 )   2916 - 2929   2016

The origin and hydrochemistry of deep well waters from the northern foot of Mt. Fuji, central Japan Reviewed

Muga Yaguchi, Yoichi Muramatsu, Hitoshi Chiba, Fumiaki Okumura, Takeshi Ohba

GEOCHEMICAL JOURNAL   50 ( 3 )   227 - 239   2016

Development of multi gas composition monitoring system for volcanic gas at Owakudani geothermal area, Hakone volcano

Daita Y., Ohba T., Kobayashi Y.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2016   132 - 132   2016

Towards the reconstruction of the shallow plumbing system of the Barombi Mbo Maar (Cameroon) Implications for diatreme growth processes of a polygenetic maar volcano Reviewed

Boris Chako Tchamabe, Takeshi Ohba, Gabor Kereszturi, Karoly Nemeth, Festus Tongwa Aka, Dieudonne Youmen, Issa, Yasuo Miyabuchi, Seigo Ooki, Gregory Tanyileke, Joseph Victor Hell

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   301   293 - 313   2015.8

A multi-tracer approach for assessing the origin, apparent age and recharge mechanism of shallow groundwater in the Lake Nyos catchment, Northwest, Cameroon

Brice Tchakam Kamtchueng, Wilson Yetoh Fantong, Mengnjo Jude Wirmvem, Rosine Edwige Tiodjio, Alain Fouepe Takounjou, Kazuyoshi Asai, Serges L. Bopda Djomou, Minoru Kusakabe, Takeshi Ohba, Gregory Tanyileke, Joseph Victor Hell, Akira Ueda

JOURNAL OF HYDROLOGY   523   790 - 803   2015.4

Framework for Investigation of Karst Aquifer in an Arid Zone, Using Isotopes, Remote Sensing and GIS Applications: the Northwestern Coast of Egypt

Mohamed Yousif, Takashi Oguchi, Katsuro Anazawa, Takeshi Ohba

ENVIRONMENTAL PROCESSES-AN INTERNATIONAL JOURNAL   2 ( 1 )   37 - 60   2015.3

Characteristics of chemical weathering and water-rock interaction in Lake Nyos dam (Cameroon): Implications for vulnerability to failure and re-enforcement

Wilson Y. Fantong, Brice T. Kamtchueng, Kohei Yamaguchi, Akira Ueda, Issa, Romaric Ntchantcho, Mengnjo J. Wirmvem, Minoru Kusakabe, Takeshi Ohba, Jing Zhang, Festus T. Aka, Gregory Tanyileke, Joseph V. Hell

JOURNAL OF AFRICAN EARTH SCIENCES   101   42 - 55   2015.1

Geochemistry of lavas from maar-bearing volcanoes in the Oku Volcanic Group of the Cameroon Volcanic Line Reviewed

Asobo N.E. Asaah, Tetsuya Yokoyama, Festus T. Aka, Tomohiro Usui, Takeshi Kuritani, Mengnjo J. Wirmvem, Hikaru Iwamori, Eric M. Fozing, Jules Tamen, Gilbert Z. Mofor, Takeshi Ohba, Gregory Tanyileke, J. V. Hell

Chemical Geology   406   55 - 69   2015

P70 Eruption history and magma systems of Nyos volcano, northwestern Cameroon

Hasegawa T., Miyabuchi Y., Kobayashi T., F.T. Aka, K. Boniface, Issa, L.A. Nche, C.S.F. Nguemhe, Kaneko K., Ohba T., Kusakabe M., G Tanyileke, J.V. Hell

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2015   168 - 168   2015

A3-02 Monitoring of CO_2 concentration of lake water at Lakes Nyos and Monoun using the depth profile of sound velocity change

Saiki K., Kaneko K., Ohba T., Johroku K.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2015   30 - 30   2015

A2-04 Measurements of water transparency in Cameroonian volcanic lakes

Johroku K., Saiki K., Kaneko K., Ohba T.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2015   25 - 25   2015

delta O-18 and delta D variations in some volcanic lakes on the Cameroon Volcanic Line (West-Africa): generating isotopic baseline data for volcano monitoring and surveillance in Cameroon

Issa, Festus Aka Tongwa, Alfred G. Mouliom, Dmitri Rouwet, Wilson Y. Fantong, Boris Chako Tchamabe, Takeshi Ohba, Yutaka Yoshida, Daniel Sighomnou, Sigha Nkamdjou, Minoru Kusakabe

JOURNAL OF LIMNOLOGY   74 ( 1 )   95 - 113   2015

A comparative review of petrogenetic processes beneath the Cameroon Volcanic Line: Geochemical constraints Reviewed

Asaah Asobo N. E, Yokoyama Tetsuya, Aka Festus T, Usui Tomohiro, Wirmvem Mengnjo J, Tchamabe Boris Chako, Ohba Takeshi, Tanyileke Gregory, Hell J. V

Geoscience Frontiers   6 ( 4 )   557 - 570   2015

Hydrochemical and isotopic characteristics of groundwater in the Ndop plain, northwest Cameroon: resilience to seasonal climatic changes

Mengnjo Jude Wirmvem, Takeshi Ohba, Justice Yuven Suila, Wilson Yetoh Fantong, Nchemty Oscar Bate, Seigo Ooki, Engome Regina Wotany, Asobo Nkengmatia Elvis Asaah, Samuel Ndonwi Ayonghe, Gregory Tanyileke, Joseph Victor Hell

ENVIRONMENTAL EARTH SCIENCES   72 ( 9 )   3585 - 3598   2014.11

Assessment of shallow groundwater in Lake Nyos catchment (Cameroon, Central-Africa): implications for hydrogeochemical controls and uses

Brice T. Kamtchueng, Wilson Y. Fantong, Akira Ueda, Edwige R. Tiodjio, Katsuro Anazawa, Mengnjo J. Wirmvem, Joseph O. Mvondo, Luc S. Nkamdjou, Minoru Kusakabe, Takeshi Ohba, Gregory Tanyileke, Joseph V. Hell

ENVIRONMENTAL EARTH SCIENCES   72 ( 9 )   3663 - 3678   2014.11

Geospatial Information and Environmental Isotopes for Hydrogeological Evaluation: Ras Alam El Rum, Northwestern Coast of Egypt Reviewed

Mohamed Yousif, Takashi Oguchi, Katsuro Anazawa, Takeshi Ohba

Natural Resources Research   23 ( 4 )   423 - 445   2014.10

Bacterial and archaeal communities in Lake Nyos (Cameroon, Central Africa) International journal

Rosine E. Tiodjio, Akihiro Sakatoku, Akihiro Nakamura, Daisuke Tanaka, Wilson Y. Fantong, Kamtchueng B. Tchakam, Gregory Tanyileke, Takeshi Ohba, Victor J. Hell, Minoru Kusakabe, Shogo Nakamura, Akira Ueda

SCIENTIFIC REPORTS   4   6151 - 6151   2014.8

Monthly delta O-18, delta D and Cl- characteristics of precipitation in the Ndop plain, Northwest Cameroon: Baseline data

Mengnjo Jude Wirmvem, Takeshi Ohba, Wilson Yetoh Fantong, Samuel Ndonwi Ayonghe, Justice Yuven Suila, Asobo Nkengmatia Elvis Asaah, Kazuyoshi Asai, Gregory Tanyileke, Joseph Victor Hell

QUATERNARY INTERNATIONAL   338   35 - 41   2014.8

Origin of major ions in monthly rainfall events at the Bamenda Highlands, North West Cameroon International journal

Mengnjo J. Wirmvem, Takeshi Ohba, Wilson Y. Fantong, Samuel N. Ayonghe, Jonathan N. Hogarh, Justice Y. Suila, Asobo Nkengmatia E. Asaah, Seigo Ooki, Gregory Tanyileke, Joseph V. Hell

JOURNAL OF ENVIRONMENTAL SCIENCES   26 ( 4 )   801 - 809   2014.4

Hydrochemistry and isotopic characteristics of non-volcanic hot springs around the Miocene Kofu granitic complex surrounding the Kofu Basin in the South Fossa Magna region, central Honshu, Japan Reviewed

Muga Yaguchi, Yoichi Muramatsu, Hitoshi Chiba, Fumiaki Okumura, Takeshi Ohba, Masumi Yamamuro

GEOCHEMICAL JOURNAL   48 ( 4 )   345 - 356   2014

Eruptive history of the Barombi Mbo Maar, Cameroon Volcanic Line, Central Africa: Constraints from volcanic facies analysis

Boris Chako Tchamabe, Dieudonne Youmen, Sebastien Owona, Issa, Takeshi Ohba, Karoly Nemeth, Moussa Nsangou Ngapna, Asobo N. E. Asaah, Festus T. Aka, Gregory Tanyileke, Joseph V. Hell

CENTRAL EUROPEAN JOURNAL OF GEOSCIENCES   5 ( 4 )   480 - 496   2013.12

Contribution of methane to total gas pressure in deep waters at lakes Nyos and Monoun (Cameroon, West Africa)

ISSA, OHBA Takeshi, FANTONG Wilson, FOUEPE Alain, TCHAMABE Boris Chako, YOSHIDA Yutaka, KUSAKABE Minoru, SIGHA Nikamojou, TSUNOGAI Urumu, OGINUMA Yu, TANYILEKE Gergory, SATAKE Hiroshi, HELL J.V.

Geochem. J.   47 ( 3 )   349 - 362   2013.6

P15 Conditions for limnic eruption of Lake Nyos, Cameroon : Numerical analysis of 1-D plume model

Kozono T., Ohba T., Kusakabe M., Yoshida Y., Suzuki Y.J.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2012   114 - 114   2012

Coseismic changes in the chemical composition of volcanic gases from the Owakudani geothermal area on Hakone volcano, Japan

Takeshi Ohba, Yasushi Daita, Takeshi Sawa, Noriyasu Taira, Yusuke Kakuage

BULLETIN OF VOLCANOLOGY   73 ( 4 )   457 - 469   2011.5

Chemical and isotopic composition of fumarolic gases at Iwate volcano, Japan, during and after seismic activity in 1998: implications for the modification of ascending volcanic gases

Takeshi Ohba, Kenji Nogami, Jun-ichi Hirabayashi, Takeshi Sawa, Kohei Kazahaya, Noritoshi Morikawa, Michiko Ohwada

ANNALS OF GEOPHYSICS   54 ( 2 )   187 - 197   2011

Monitoring active volcanoes: The geochemical approach

Salvatore Inguaggiato, Agnes Mazot, Takeshi Ohba

ANNALS OF GEOPHYSICS   54 ( 2 )   115 - 119   2011

Magmatic fluids of Tatun volcanic group, Taiwan

Takeshi Ohba, Takeshi Sawa, Noriyasu Taira, Tsanyao Frank Yang, Hsiao Fen Lee, Tefang Faith Lan, Michiko Ohwada, Noritoshi Morikawa, Kohei Kazahaya

APPLIED GEOCHEMISTRY   25 ( 4 )   513 - 523   2010.4

Development of an Unmanned Observation Aerial Vehicle (UAV)as a Tool for Volcano Survey Reviewed

Kazuto Saiki, Takeshi Ohba

Bulletin of the volcanological society of Japan   55 ( 3 )   137 - 146   2010.4

An efficient method for measuring CO2 concentration in gassy lakes: Application to Lakes Nyos and Monoun, Cameroon

Yutaka Yoshida, Issa, Minoru Kusakabe, Hiroshi Satake, Takeshi Ohba

GEOCHEMICAL JOURNAL   44 ( 5 )   441 - 448   2010

P62 MAGMATIC FLUID SUPPLY INTO LAKES NYOS AND MONOUN, AND MITIGATION OF NATURAL DISASTERS IN CAMEROON

Ohba T., Kusakabe M., Yoshida Y., Kozono T., Suzuki Y., Ichihara M., Saiki K., Kaneko K., Anazawa K., Sugai T., Tsujimura M., Ueda A., Terada A., Miyabuchi Y., Kobayashi T.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2010   154 - 154   2010

Noble gas and stable isotope geochemistry of thermal fluids from Deception Island, Antarctica

Minoru Kusakabe, Keisuke Nagao, Takeshi Ohba, Jung Hun Seo, Sung-Hyun Park, Jong Ik Lee, Byong-Kwon Park

ANTARCTIC SCIENCE   21 ( 3 )   255 - 267   2009.6

AMS Analysis of ¹²⁹I and its application to the study of iodine-rich underground fluids

Muramatsu Yasuyuki, Kashiwagi Yu, Ohba Takeshi, Kazahaya Kouhei, Matsuzaki Hiroyuki

Abstracts of Annual Meeting of the Geochemical Society of Japan   56   265 - 265   2009

P49 Volcanic fluid at Mt. El Chichon, Mexico

OHBA Takeshi, KAKUAGE Yusuke, TAIRA Noriyasu, OHWADA Michiko, MORIKAWA Noritoshi

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2009   149 - 149   2009

P47 Modeling of Water-Rock Interaction of Hot Spring Water in Hakone Volcano

KAKUAGE Yusuke, OHBA Takeshi

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2009   147 - 147   2009

B07 Coseismic changes in the chemical and isotopic composition of volcanic gases at Owakudani geothermal area on Hakone volcano, Japan

OHBA Takeshi, DAITA Yasushi, SAWAI Takeshi, TAIRA Noriyasu, KAKUAGE Yusuke

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2009   57 - 57   2009

Temporal changes in the chemistry of lake water within Yugama Crater, Kusatsu-Shirane Volcano, Japan: Implications for the evolution of the magmatic hydrothermal system Reviewed

Takeshi Ohba, Jun-ichi Hirabayashi, Kenji Nogami

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   178 ( 2 )   131 - 144   2008.12

Magma degassing process during the eruption of Mt. Unzen, Japan in 1991 to 1995: Modeling with the chemical composition of volcanic gas

Takeshi Ohba, Jun-ichi Hirabayashi, Kenji Nogami, Minoru Kusakabe, Minoru Yoshida

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   175 ( 1-2 )   120 - 132   2008.7

Origin of volcanic gases discharging from a cooling lava dome of Unzen volcano, Japan Reviewed

Hiroshi Shinohara, Takeshi Ohba, Kohei Kazahaya, Hiroshi Takahashi

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   175 ( 1-2 )   133 - 140   2008.7

129I and Halogen concentrations in hydrothermal system, at Kusatsu-Shirane Volcano, Japan

Kashiwagi Yu, Muramatsu Yasuyuki, Ohba Takeshi

Abstracts of Annual Meeting of the Geochemical Society of Japan   55   197 - 197   2008

Evolution of CO2 in Lakes Monoun and Nyos, Cameroon, before and during controlled degassing Reviewed

Minoru Kusakabe, Takeshi Ohba, Issa, Yutaka Yoshida, Hiroshi Satake, Tsuyoshi Ohizumi, William C. Evans, Gregory Tanyileke, George W. Kling

GEOCHEMICAL JOURNAL   42 ( 1 )   93 - 118   2008

A33 Volcanic Hydrothermal System of Meakandake, Hokkaido

Taira Noriyasu, Ohba Takeshi, Ohwada Michiko, Morikawa Noritoshi, Kazahaya Kohei

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2008   33 - 33   2008

A19 Low enthalpy of magmatic component in the fumarolic gas at Ojigokudani geothermal area on Iwate volcano, Japan : Implication to the structure of volcanic body

Ohba T., Hirabayashi J., Nogami K., Sawa T., Kazahaya K., Morikawa N., Ohwada M.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2008   19 - 19   2008

C09 Correlation between the Mg/Cl variation in lake water of Yugama crater, Mt. Kusatsu-Shirane and the volcanic activities

Ohba T., Yamawaki T., Hirabayashi J., Ogawa Y., Nogami K.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2007   29 - 29   2007

P17 Formation process of fumarolic gases at Mt. Mihara of Izu-Oshima volcano, Japan

Ohba T., Taira N., Shimizu A., Kakuage Y.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2007   47 - 47   2007

Formation process of recent fumarolic gases at the Mt. Mihara summit peak of the Izu-Oshima volcano, Japan Reviewed

Takeshi Ohba

EARTH PLANETS AND SPACE   59 ( 10 )   1127 - 1133   2007

A22 The lava of Mt. Unzen-Fugen experienced three steps degassing(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)

Ohba T., Hirabayashi J., Nogami K., Yoshida M.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2006   21 - 21   2006

P42 Experimental remote sensing of volcanic gas composition by Laser Raman spectroscopy(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)

OHBA Takeshi

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2006   156 - 156   2006

P57 Magma degassing process of Mt. Unzen inferred from the chemical composition of volcanic gas(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2005 FALL MEETING)

OHBA Takeshi, HIRABAYASHI Jun-ichi, NOGAMI Kenji, YOSHIDA Minoru, KUSAKABE Minoru

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2005   157 - 157   2005

A55 The shallow volcanic hydrothermal system beneath Owakudani on Mt. Hakone Volcano(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2005 FALL MEETING)

Sawa Takeshi, Ohba Takeshi, Hirabayashi Jun-ichi

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2005   55 - 55   2005

Geothermal system of Sakurajiam volcano

Hirabayashi J., Ohba T., Nogami K., Yamamoto K., Ishihara K.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2001   12 - 12   2001

Water-soluble components adhered to the ejecta from Usuzan in 2000

Nogami K., Hirabayashi J., Ohba T., Suzuki A., Nishimura Y.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2000   27 - 27   2000

Flux of volcanic gas from Kusatsu-Shirane volcano

Suzuki Takashi, Hirabayashi Junichi, Ohba Takeshi, Nogami Kenji, Kagiyama Tsuneomi

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2000   102 - 102   2000

The 2000 Eruption of Usu Volcano and Geochemical Study

Hirabayashil J., Abiko T., Nogami K., Ohba T., Maekawa T., Suzuki A., Suzuki T.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2000   26 - 26   2000

Water quality changes of Kusatsu hot springs caused by the emergence of Bandaiko hot spring

OSSAKA Joyo, OSSAKA Tomoko, HIRABAYASHI Jun-ichi, OI Takao, OHBA Takeshi, NOGAMI Kenji, KAWADA Yoshikazu, HIDA Noriko

Journal of The Balneological Society of Japan   47 ( 4 )   166 - 178   1998.3

Changes of chemical composition in volcanic gases from Kuju volcano, and evaluation of volcanic activity

Hirabayashi J., Ohba T., Nogami K.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1998   14 - 14   1998

Evolution of fumarolic gases and waters from Iwate volcano, Japan

OHBA T., Hirabayashi J., Nogami K., Umezu Y.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1998   86 - 86   1998

Volcanic activity of Kusatsu-Shirane volcano, Gunma, and secular change in water quality of crater lake Yugama(Volcanic activity,<Special Issue>Geochemistry of Natural Disaster)

OSSAKA Joyo, OSSAKA Tomoko, HIRABAYASHI Jun-ichi, OI Takao, OHBA Takeshi, NOGAMI Kenji, KIKAWADA Yoshikazu, YAMANO Mayumi, YUI Mitsuaki, FUKUHARA Hideki

Geochemistry   31 ( 2 )   119 - 128   1997.5

Volcanic gas accident at Hakkoda volcano

Hirabayashi J., Ohba T., Nogami K., Turumi M., Notsu K.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1997   63 - 63   1997

Chemical and isotopic composition of spring waters from Hakkoda volcano, Japan

Ohba T., Hirabayashi J., Nogami K.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1997   64 - 64   1997

Changes in the crater lake "Yugama" on Kusatsu-Shirane volcano, and the response to the volcanic activity

OHBA Takeshi, HIRABAYASHI Junichi, NOGAMI Kenji

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1996   97 - 97   1996

Oxidation of lava from the Unzen volcano by hydron gas emission

OHBA Takeshi, HIRABAYASHI Junichi, NOGAMI Kenji

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1995   106 - 106   1995

Isotope ratios of lake water in the active crater at Kusatsu-Shirane volcano, Japan Reviewed

T OHBA, K NOGAMI, J HIRABAYASHI

WATER-ROCK INTERACTION   321 - 322   1995

Chemical characteristics of lake water of Yugama at Kusatsu-Shirane Volcano corresponding to volcanic activity

Ossaka J., Yui M., Ossaka T., Oi T., Hirabayashi J., Ohba T., Nogami K.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1994   170 - 170   1994

The effect of internal reactions on the redox state of volcanic gases

OHBA Takeshi, HIRABAYASHI Junichi, NOGAMI Kenji

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1994   229 - 229   1994

Chemical composition of volcanic gases and discharge rate of SO₂ from Unzen volcano

Hirabayashi J., Ohba T., Yoshida M., Kusakabe M., Scott G. L.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1992   103 - 103   1992

Chemical composition and discharge rate of volcanic gas associated with the eruptive activity from 1990 of Unzen volcano

HIRABAYASHI J., OHBA T., OHTA K., OSSAKA J., OZAWA T., YOSHIDA M., NOGAMI K., YAMAMOTO M.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1991   64 - 64   1991

Enthalpy measurement of volcanic gas

OHBA Takeshi, HIRABAYASHI Junichi

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1991   174 - 174   1991

Chemical and isotopic signatures of soil and bubbling gases from Akitakomagatake and its adjacent hot springs

Hirabayashi J., Ohba T., Kita I., Nitta K., Iguchi M.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1991   14 - 14   1991

Chemical Composition of Volcanic gases Associated with the 1990 Eruption of Unzen Volcano, Japan

HIRABAYASHI J., Ohba T., OSSAKA J., Nogami K., Yamamoto M.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1991   9 - 9   1991

D/H study on clay minerals from the Iwami Kuroko deposit, Shimane Prefecture, Japan.

KURODA YOSHIMASU, KIDA YOSHIHARU, WATANABE KOJI, OBA TAKESHI, MATSUO SADAO

JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY   81 ( 8 )   302 - 311   1986

Interaction between magmatic fluid and meteoric water in hydrothermal system inferred from noble gas isotopic compositions of fumarolic gases at Kusatsu-Shirane volcano, Japan

IUGG 2003 general assembly Abstract  2003 

Chemical composition of volcanic gases from Mt.Unzen, Japan: Implication to the magma degassing process

IUGG 2003 general assembly Abstract  2003 

Geochemical survey at Rabaul caldera, Papua New Guinea

IUGG 2003 general assembly Abstract  2003 

草津白根山の地球化学的観測

第20回イオンクロマトグラフィー討論会要旨集（大岡山）  2003 

Geochemical survey at Rabaul caldera, Papua New Guinea

Eighth field workshop on volcanic gases, Abstract  2003 

Interaction of volcanic gases with ground water at the Use 2000 eruption

IUGG 2003 general assembly Abstract  2003 

Hydrogen and Oxygen Isotopes in Hydrology - The Textbook for the Elventh IHP training course in 2001

United Nations Educational Scientific and Cultural Organization (UNESCO)  2001 

Hydrogen and Oxygen Isotopes in Hydrology - The Textbook for the Elventh IHP training course in 2001

United Nations Educational Scientific and Cultural Organization (UNESCO)  2001 

Geochemical study

Reports on volcanic activities and volcanological studies in Japan for the period from 1995 to 1998  1999 

Geochemical study

Reports on volcanic activities and volcanological studies in Japan for the period from 1995 to 1998  1999 

Spatial distribution of Helium isotope ratios in soil gas outside the Yugama crater at Kusatsu-Shirane volcano: An attempt to detect potential fracture zones

若松海, 寺田暁彦, 角野浩史, 小長谷智哉, 谷口無我, 大場武

日本火山学会講演予稿集   2021   2021

Introduction of the Special Issues on“Understanding Volcanoes by Integrating Eruptive History Research and Volcano Observations”

奥野充, 井口正人, 三好雅也, 三浦大助, 小林淳, 橋本武志, 大場武, 佐藤鋭一, 宝田晋治

火山   66 ( 2 )   2021

Temporal variation in the ratio of magmatic helium and argon in fumarolic gases at Kusatsu-Shirane volcano

小長谷智哉, 角野浩史, 外山浩太郎, 外山浩太郎, 大場武, 谷口無我, 寺田暁彦

日本地球化学会年会要旨集(Web)   68th   2021

Temporal variations of helium and carbon isotopic compositions of fumarolic gases at Hakone volcano

小長谷智哉, 角野浩史, 外山浩太郎, 大場武, 谷口無我

日本火山学会講演予稿集   2021   2021

水蒸気噴火と化学

大場 武

化学と教育   68 ( 5 )   204 - 207   2020.5

Temporal and spatial variations of helium isotope ratios at Kirishima volcanic group

角野浩史, 外山浩太郎, 小長谷智哉, 滝口孝寛, 大場武, 谷口無我

日本火山学会講演予稿集   2020   2020

Observation campaign of seismic activity and geochemistry of hot spring waters at western flank of Kusatsu-Shirane volcano, Japan

寺田暁彦, 香取慧, 谷口無我, 山本希, 山田大志, 鬼澤真也, 西澤達治, 青山裕, 森田裕一, 大場武

日本地球惑星科学連合大会予稿集(Web)   2020   2020

Noble gas isotopes of fumaroles and hot-spring gases at Kusatsu-Shirane volcano

小長谷智哉, 角野浩史, 外山浩太郎, 川名華織, 山根康平, 大場武, 谷口無我, 寺田暁彦

日本火山学会講演予稿集   2020   2020

CO₂/H₂S ratio determination by use of Test-tube system

OHBA Takeshi

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2019   204 - 204   2019

Relationship between the magma/hydrothermal components ratio in volcanic gas and the volcanic activity

OHBA Takeshi

Abstracts of Annual Meeting of the Geochemical Society of Japan   66   120   2019

湯釜湖水のCl濃度・水安定同位体および精密震源分布から推定される草津白根火山の熱水系

桑原知義, 寺田暁彦, 大場武, 行竹洋平, 神田径, 小川康雄

日本地球惑星科学連合大会予稿集(Web)   2017   ROMBUNNO.SVC48‐02 (WEB ONLY)   2017

箱根山火山ガスの時間変化とその解釈

大場武, 谷口無我, 代田寧, 角皆潤, 鋤柄千穂

日本地球惑星科学連合大会予稿集(Web)   2017   2017

立山地獄谷の温泉水の同位体比

関香織, 大場武, 青山慎之介, 上野雄一郎, 神田径, 丹保俊哉

日本地球惑星科学連合大会予稿集(Web)   2017   ROMBUNNO.AHW35‐02 (WEB ONLY)   2017

関東平野北部における温泉の水質および安定同位体比とその地質鉱物学的解釈

村松 容一, 谷口 無我, 大場 武

温泉科学 = Journal of hot spring sciences = Journal of the Balneological Society of Japan   66 ( 1 )   4 - 20   2016.6

Fluid Formation Mechanism of Deep Chloride Hot Spring Waters from the Central Kanto Plain, Central Japan : Diagenetic Evolution of Pore Water Trapped in the Kazusa and Annaka-Awa Groups

65 ( 4 )   216 - 233   2016.3

Genesis of Highly Saline Hot Spring Waters from the Southern Itoigawa-Shizuoka Tectonic Line and Areas East : Genetic Analogy of the Kashio Highly Saline Hot Spring Waters from the Median Tectonic Line

66 ( 2 )   70 - 88   2016

化学で解き明かす火山噴火のメカニズム : 御嶽山,箱根山に見る火山活動の実態

大場 武

化学 = Chemistry   70 ( 11 )   12 - 16   2015.11

Variable isotopic composition of water vapor and H2 in the fumarolic gases at Owakudani geothermal area on Hakone volcano, Japan

OHBA Takeshi, Yaguchi Muga, Takagi Kenta, Sago Masakazu, Ikeya Kosuke, Tsunogai Urumu

Abstracts of Annual Meeting of the Geochemical Society of Japan   62 ( 0 )   2015

A3-16 A model for the eruptive activity in 2015 at Mt Hakone interpreted by the composition of volcanic gases

Ohba T, Yaguchi M, Takagi K, Sago M, Daita Y, Ikeya K, Tsunogai U

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2015 ( 0 )   44 - 44   2015

カメルーン北西部,ニオス火山の噴火史

長谷川健, 宮縁育夫, 小林哲夫, AKA Festus, BONIFACE Kankeu, ISSA, MICHE Linus, FILS Salomon, 金子克哉, 大場武, 日下部実, GREGORY Tanyileke, JOSEPH Hell

日本地球惑星科学連合大会予稿集(Web)   2015   2015

B1-22 Eruption history of Nyos volcano, northwestern Cameroon : Preliminary report

Hasegawa T., Miyabuchi Y., Kobayashi T., Aka Festus T., Boniface Kankeu, Kaneko K., Ohba T., Kusakabe M., Tanyileke Gregory, Hell Joseph

Programme and abstracts the Volcanological Society of Japan   2014   66 - 66   2014.11

P1-11 Temporal variation in the chemical composition of the fumarolic gas at Owakudani geothermal area during the Hakone swarm activity

DAITA Yasushi, OHBA Takeshi

Programme and abstracts the Volcanological Society of Japan   2014   129 - 129   2014.11

O14-06 音波を利用した火山湖探査(口頭発表セッション14 探査II,口頭発表)

佐伯 和人, 金子 克哉, 大場 武

日本惑星科学会秋期講演会予稿集   2014   "O14 - 06"   2014.9

P51 Modeling of CO_2-injection into lake water and limnic eruption based on FEM

Kozono T., Ohba T., Kusakabe M., Yoshida Y., Suzuki Y.J.

Programme and abstracts the Volcanological Society of Japan   2013   151 - 151   2013.9

甲府盆地周縁の新第三紀花崗岩体周辺に分布する非火山性温泉の水質および安定同位体の特徴

谷口無我, 村松容一, 千葉仁, 大場武, 奥村文章, 山室真澄

日本地球化学会年会講演要旨集   60th   2013

B3-08 Measurement of CO_2 concentration in Cameroonian volcanic lakes by Sound Velocity Method

Sanemasa M., Saiki K., Kaneko K., Ohba T., Kusakabe Minoru, Tanyileke G., Hell J. V.

Programme and abstracts the Volcanological Society of Japan   2012   89 - 89   2012.10

Geochemical study on the groundwater-surface water around Lake Nyos, Cameroon

ANAZAWA Katsuro, UEDA Akira, OHBA Takeshi, KUSAKABE Minoru, YOSHIDA Yutaka, Fantong Y.W, Tanyileke G, Hell J.V

Abstracts of Annual Meeting of the Geochemical Society of Japan   59 ( 0 )   2012

Water chemistry of lakes Nyos and Monoun, Cameroon

Ohba Takeshi, Sasaki Yuka, Kusakabe Minoru, Yoshida Yutaka, Ueda Akira, Anazawa Katsuro, Kaneko Katsuya, Yasuo Miyabuchi, F.T. Issa, W Aka, G Fantong, J.V. Tanyileke

Abstracts of Annual Meeting of the Geochemical Society of Japan   59   307   2012

A Study on the Origin of Dissolved Inorganic Carbon in Hot Spring Waters at Kojiri and Ashinoko Areas in Western Hakone Caldera, Central Japan

DAITA Yasushi, OHBA Takeshi, KIKUGAWA George, ITADERA Kazuhiro

Journal of hot spring sciences   61 ( 2 )   97 - 105   2011.9

Correlation between the CO_2/H_2O ratio of volcanic gas and eruptive potential

OHBA Takeshi

Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2011   89 - 89   2011.9

An empirical relationship between ground-surface temperature and heat-discharge rate on the northern part of Owakudani geothermal field of Hakone volcano, Japan

Bulletin of the Hot Springs Research Institute of Kanagawa Prefecture   41   15 - 21   2009.12

Temporal variation in the composition of volcanic gases at Owakudani geothermal area developed on the central cones of Hakone volcano caldera

Bulletin of the Hot Springs Research Institute of Kanagawa Prefecture   40   1 - 10   2008.12

Isotopic fractionation of SO_2 and H_2S gases during the absorption by KOH solution, with the application to volcanic gas monitoring at Miyakejima Island, Japan

OHBA TAKESHI, NOGAMI KENJI, HIRABAYASHI JUN-ICHI, MORI TAKEHIKO

Geochemical Journal   42 ( 1 )   119 - 131   2008.2

箱根大涌谷地熱地帯における火山ガスの化学組成および同位体比の変化

大場武

地球惑星科学関連学会2007年合同大会講演予稿集   2007

Magma-hydrothermal system of Kusatsu-Shirane volcano modeled by the secular change in chemical composition of crater lake water

81 - 96   2007

The hydrothermal system beneath Owakudani on Hakone Volcano, Japan; Traced by stable isotopic ratios of H2O

Takeshi Sawa, Takeshi Ohba, Jun-ichi Hirabayashi

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   43 ( 4 )   468 - 473   2006.4

A54 Variation of chemical composition in volcanic gases and fumarolic temperature at Kuchinoerabujima(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2005 FALL MEETING)

Hirabayashi J, Nogami K, Onizawa S, Ohba T, Iguchi M, Kanda W, Ohima M

Programme and abstracts the Volcanological Society of Japan   2005   54 - 54   2005.10

Degassing Lakes Nyos and Monoun: Defusing certain disaster

GW Kling, WC Evans, G Tanyileke, M Kusakabe, T Ohba, Y Yoshida, JV Hell

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   102 ( 40 )   14185 - 14190   2005.10

Bathymetric and geochemical investigation of Kawah Ijen crater lake, east Java, Indonesia

B Takano, K Suzuki, K Sugimori, T Ohba, SM Fazlullin, A Bernard, S Sumarti, R Sukhyar, M Hirabayashi

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   135 ( 4 )   299 - 329   2004.8

パプアニューギニア，ラバウルカルデラにおける地球化学観測

大場武 MulinaKila, 野上健治, 西村裕一

2004

Effects of degassing of Lakes Nyos and Monoun, Cameroon, on their physico-chemical structures

M. Kusakabe, T. Ohba, Y, Yoshida G. Tanyileke, W.C. Evans, G.W. Kling

IAVCEI General assembly 2004 Pucon-Chile   2004

B01 Strengthening the volcano monitoring capacity in Costa Rica

Ohba Takeshi

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2004   65 - 65   2004

パプアニューギニア，タブルブル火山の地球化学的モニタリング

野上健治, 西村裕一, 大場武 MulinaKila ItikaraiIma

地球惑星科学合同大会講演予稿集CD-ROM,v005-p002   2004

富士山東山麓に出現した噴気の地球化学観測

大場武, 清水綾, 長尾敬介, 大和田道子, 風早康平, 水橋正英, 及川光弘

地球惑星科学合同大会予稿集CD-ROM,v005-P015   2004

Transition of degassing processes from syn-eruptive to post-eruptive activities at Unzen volcano

H.Shinohara, T.Ohba, K.Kazahaya

Eos Trans. AGU   85 ( 47 )   Fall meet.Suppl. Abstr., V24B-07   2004

Effects of degassing of Lakes Nyos and Monoun, Cameroon, on their physico-chemical structures

M. Kusakabe, T. Ohba, Y, Yoshida G. Tanyileke, W.C. Evans, G.W. Kling

IAVCEI General assembly 2004 Pucon-Chile   2004

なぜ噴火の前にSO2が増えるのか？草津白根山，ポアス山の事例に対するモデルの提案

大場武, 平林順一, 野上健治

草津白根山研究集会２００４年９月，群馬県草津町   2004

Transition of degassing processes from syn-eruptive to post-eruptive activities at Unzen volcano

H.Shinohara, T.Ohba, K.Kazahaya

Eos Trans. AGU   85 ( 47 )   Fall meet.Suppl. Abstr., V24B-07   2004

Lakes Nyos and Monoun, Cameroon: Current status

M Kusakabe, K Nagao, T Ohba, Y Yoshida, G Tanyileke, GW Kling, WC Evans

GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A244 - A244   2003.9

O-18/O-16 ratio of sulfate in acidic hot spring waters from Kusatsu-Shirane volcano, Japan for the estimation of cooling rate of the water

T Ohba, S Mizuhashi, J Hirabayashi, K Nogami, M Kusakabe

GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A350 - A350   2003.9

Formation of acid volcanic brines through interaction of magmatic gases, seawater and rock within the White Island volcanic-hydrothermal system, New Zealand

H Shinohara, WF Giggenbach, M Kusakabe, T Ohba

GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A433 - A433   2003.9

Geochemical monitoring of volcanic activity of Kuji volcano after the 1995 eruption

Nogami Kenji, Hirabayashi Junichi, Ohba Takeshi, Sudo Yasuaki, Tsutsui Tomoki

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2003 ( 0 )   153 - 153   2003

Flux of volatile components from Kusatsu-Shirane volcano, Japan

Mizuhashi S., Hirabayashi J., Nogami K., Oikawa M., Saito M., Ohba T.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2003   12 - 12   2003

Origins of Radon in fumarolic gases at Kusatsu-Shirane volcano, Japan

Oikawa M., Hirabayashi J., Ohba T., Nogami K., Mizuhashi S., Katabuchi Y.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2003   11 - 11   2003

カメルーン・マヌーン湖のガス抜き開始

日下部実, 長尾敬介, 大場武, 吉田裕, 佐竹洋

地球惑星科学関連学会２００３年合同大会講演予稿集CD-ROM   V055-003   2003

草津白根山東山麓に発達する熱水系について

大場武, 片渕雄次, 平林順一, 小川康雄, 野上健治, 森健彦, 大和田道子, 水橋正英, 及川光弘, 斉藤政城

地球惑星科学関連学会２００３年合同大会講演予稿集CD-ROM   V055-015   2003

Formation of acid volcanic brines through interaction of magmatic gases, seawater, and rock within the WhiteIsland volcanic-hydrothermal system, New Zealand

Giggenbach, W. Shinohara, H. Kusakabe, Ohba, T

Soc.Econ.Geol.Special Pub.   10   19 - 40   2003

Interaction between magmatic fluid and meteoric water, inferred from O-18/O-16 and Ar-36[H2O ratios of fumarolic gases at the Kusatsu Shirane volcano, Japan

M Ohwada, T Ohba, J Hirabayashi, K Nogami, K Nakamura, K Nagao

EARTH PLANETS AND SPACE   55 ( 2 )   105 - 110   2003

Magma-Hydrothermal system of Kusatsu-Shirane volcano, Japan

Ohba T., Nogami K., Hirabayashi J., Mizuhashi S., Oikawa M., Saito M.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2003   119 - 119   2003

口永良部島火山の地球化学的観測

水橋正英, 平林順一, 野上健治, 大場武, 井口正人

日本火山学会講演予稿集２００３年度秋季大会（福岡）   154   2003

Volcanic gas from Ohwakudani fumarolic area, Mt. Hakone Japan

Ohba T., Katabuchi Y., Nakamura K., Oikawa M., Ohwada M., Mizuhashi S.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2002   121 - 121   2002

雲仙普賢岳の火山ガス組成から推定するマグマ脱ガス過程

大場武, 平林順一, 野上健治

地球惑星科学関連学会合同大会予稿集（東京，代々木），CD-ROM   2002

：草津白根山の噴気孔ガスと低温火山ガス

片渕雄次, 大場武, 平林順一, 野上健治, 中村一茂, 大和田道子

地球惑星科学関連学会合同大会予稿集（東京，代々木），CD-ROM   2002

同位体を利用した草津白根山火山熱水系の研究

大場武, 野上健治, 中村一茂, 鈴木隆, 大和田道子, 平林順一

地球惑星科学関連学会合同大会予稿集（東京，代々木），CD-ROM   2002

Chemical composition of volcanic gases from Mt.Unzen, Japan: Implication to the magma degassing process

Ohba, T. Hirabayashi, J. Nogami, K. Yoshida, M

Extended abstract for Unzen Workshop 2002, Shimabara, Japan   97 - 98   2002

Geochemical Monitoring of the 2000 Eruption of Usu Volcano : Relationship between Change of Water-soluble Components Adhering to Volcanic Ashes and Volcanic Activity

NOGAMI Kenji, HIRABAYASHI Jun-ichi, OHBA Takeshi, ABIKO Tsutomu, OKADA Hiromu, NISHIMURA Yu'ichi, MAEKAWA Tokumitsu, SUZUKI Atsuo

Bulletin of the Volcanological Society of Japan   47 ( 4 )   325 - 332   2002

1998Seismic Exploration, ASO98, in AsoVolcano

Sudo Yasuaki, Tsutsui Tomoki, Ono Hiroyasu

Bulletin of the Earthquake Research Institute, University of Tokyo   77 ( 4 )   303 - 336   2002

Flux of volatile components discharged as hot spring water at Kusatsu-Shirane volcano, Japan

Mizuhashi S., Hirabayashi J., Nogami K., Ohba T., Suzuki T., Ohwada M.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2002   120 - 120   2002

Noble gas isotopic compositions in volcanic gases from north flank fumarolic area at Kusatsu-Shirane volcano, Japan

Ohwada M., Ohba T., Hirabayashi J., Nogami K., Nakamura K., Nagao K.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2002   119 - 119   2002

SO₂ flux from Mt. Asama

Hirabayashi J., Nogami K., Mori T., Ohba T., Ohwada M., Katabuti Y., Mizuhashi S., Oikawa M., Koyama E.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2002   202 - 202   2002

Observation of Volcanic gas from Miyakejima

Hirabayashi J., Nogami K., Mori T., Ohba T., Kazahaya K., JMA

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2002   4 - 4   2002

Chemical composition of volcanic gases from Mt.Unzen, Japan: Implication to the magma degassing process

Ohba, T. Hirabayashi, J. Nogami, K. Yoshida, M

Extended abstract for Unzen Workshop 2002, Shimabara, Japan   97 - 98   2002

草津白根山の噴気孔ガスと低温ガス

片渕雄二, 大場武, 平林順一, 野上健治, 大和田道子, 水橋正英

月刊地球   ( 39 )   46 - 51   2002

草津白根山における火山ガスの希ガス同位体組成

大和田道子, 大場武, 平林順一, 野上健治, 中村一茂, 長尾敬介

２００１年度日本地球化学会第４８回年会講演要旨集   125   2001

有珠山２０００ 年噴火で形成された噴気地帯の火山ガス

大場武, 平林順一, 野上健治, 安孫子勤

地球惑星科学関連合同学会２００１年合同大会予稿集（ＣＤ－ＲＯＭ）   2001

草津白根山北方斜面噴気地帯火山ガスの化学組成および安定同位体比

中村一茂, 大場武, 平林順一, 野上健治

地球惑星科学関連合同学会２００１年合同大会予稿集（ＣＤ－ＲＯＭ）   2001

Hydrothermal system of Kusatsu-Shirane Volcano, Japan

T Ohba

WATER-ROCK INTERACTION, VOLS 1 AND 2   891 - 893   2001

九重火山における噴気圧力振動の測定

鈴木隆, 吉川美由紀, 森健彦, 平林順一, 大場武, 須藤靖明, 橋本武志, 迫幹男, LONDONO J

日本火山学会講演予稿集   2001   2001

SO2ガスがアルカリ性水溶液に吸収される際の同位体分別

大場武, 平林順一, 野上健治

２００１年度日本地球化学会第４８回年会講演要旨集   72   2001

Degassing of magma responsible for the change in the composition of volcanic gases from Unzen volcano, Japan

Ohba T., Hirabayashi J., Nogami K., Yoshida M.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2001   97 - 97   2001

三宅島火山２０００ 年噴火で大気に拡散した硫黄成分の濃度と同位体比

大場武, 平林順一, 野上健治

地球惑星科学関連合同学会２００１年合同大会予稿集（ＣＤ－ＲＯＭ）   2001

Hydrothermal system of Kusatsu-Shirane volcano, Japan

Takeshi OHBA

Proceedings of the tenth international symposium on water-rock interaction WRI-10/ Villasimius/Italy/10-15 July 2001   891 - 893   2001

The 1997 phreatic eruption of Akita-Yakeyama volcano, northeast Japan: Insight into the hydrothermal processes

Takeshi OHBA

EPS   52 ( 4 )   229 - 236   2001

Temporal variations in the constituents of volcanic ash and adherent water-soluble components in the Unzen Fugendake eruption during 1990-1991

K Nogami, J Hirabayashi, T Ohba, J Ossaka, M Yamamoto, S Akagi, T Ozawa, M Yoshida

EARTH PLANETS AND SPACE   53 ( 7 )   723 - 730   2001

草津白根山の火山熱水系

大場武

火山の浅部構造と火山性流体，京都大学防災研究所   K12-3   161 - 168   2001

Analytical Chemistry in the Research for the Prediction of Volcanic Eruption.

OHBA Takeshi

308   465 - 469   2000.8

D/H and O-18/O-16 ratios of water in the crater lake at Kusatsu-Shirane volcano, Japan

T Ohba, J Hirabayashi, K Nogami

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   97 ( 1-4 )   329 - 346   2000.4

D/H and O-18/O-16 ratios of water in the crater lake at Kusatsu-Shirane volcano, Japan

T Ohba, J Hirabayashi, K Nogami

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   97 ( 1-4 )   329 - 346   2000.4

Volcanic hydrothermal system of Mt. Kusatsu-Shirane, Japan

OHBA Takeshi, HIRABAYASHI Jun-ichi, NOGAMI Kenji

49 ( 4 )   163 - 175   2000.3

On the chemical and isotopic composition of fumarolic gases from Kuju volcano, Japan

Ohba, T. Hirabayashi, J. Nogami, K Sata, M

Seventh Field Workshop on Volcanic Gases Extended Abstract (Satsuma-Iwojima, Kuju, Jpana)   2000

九重火山における新噴気の形成過程

大場武, 平林順一, 野上健治, 佐藤雅規

地球惑星科学関連学会合同大会予稿集   CDROM   2000

D/H and 18O/16O ratios of water in the crater lake at Kusatsu-Shirane volcano

Takeshi OHBA, HIRABAYASHI Kenji NOGAMI

EOS   81 ( 22 )   H41A-04   2000

The 1997 phreatic eruption of Akita-Yakeyama volcano, northeast Japan: Insight into the hydrothermal processes

K Nogami, J Hirabayashi, T Ohba, Y Yoshiike

EARTH PLANETS AND SPACE   52 ( 4 )   229 - 236   2000

有珠山2000年噴火の様式と活動の変化

大場武

自然災害科学   19 ( 3 )   375 - 381   2000

On the chemical and isotopic composition of fumarolic gases from Kuju volcano, Japan

OHBA T.

IAVCEI Commission on the Chemistry of Volcanic Gases, 7th Field Workshop abstract, 2000   2000

Volcanic gases from Usu volcano, the process of formation

Ohba T., Hirabayashi J., Nogami K., Abiko T.

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   2000   182 - 182   2000

CO_2_に富んだ低温の火山ガスについて

大場武, 平林順一, 野上健治

日本地球化学会年会講演要旨集（山形大学）   81   2000

Geochemical and geothermal study associated with the Usu 2000 eruption, and changes of It's activity

Takeshi OHBA

J.JSNDS   19 ( 3 )   375 - 381   2000

桜島火山の地下水・熱水系

大場武, 平林順一, 野上健治, 石原和弘, 山本圭吾

京都大学防災研報告書｢桜島火山の地下水・熱水系に関する研究｣   31 - 47   1999

草津白根山火口湖における水，熱，塩化物イオンの収支

大場武

月刊海洋   ( 19 )   95 - 99   1999

岩手火山における噴気の形成過程

大場武, 野上健治, 平林順一

日本地球化学会年会講演要旨集   1999

岩手山の火山ガス

大場武

月刊地球   21 ( 5 )   285 - 289   1999

草津白根山火口湖熱水系の構造

大場武, 平林順一, 野上健治

地球惑星科学関連学会1999年合同大会予稿集(CD-ROM)   1999

岩手火山における噴気の形成メカニズム

大場武, 野上健治, 平林順一

地球惑星科学関連学会1999年合同大会予稿集(CD-ROM)   1999

火山ガス成分と桜島火山の活動状況(9)

平林順一, 大場 武, 江頭庸夫, 井口正人, 坂元隼雄, 平林順一, 大場 武, 江頭庸夫, 坂元隼雄

第9回桜島火山の集中総合観測   91 - 100   1998

Report on IAVCEI General Assembly, Puerto-Vallarta, Mexico, 1997

HAMAGUCHI Hiroyuki, TAKARADA Shinji, SAITO Genji, KAZAHAYA Kohei, OHBA Takeshi, SHINOHARA Hiroshi, SUDO Yasuaki, WATANABE Hidefumi

Bulletin of the Volcanological Society of Japan   42 ( 3 )   233 - 238頁   1997.6

Chemical equilibrium in high temperature volcanic gas

OHBA Takeshi

Chikyukagaku   31 ( 2 )   99 - 110   1997

Hydrothermal System of the Kirishima Volcanic Area Inferred from the Chemical and Isotopic Composition of Spring Waters and Fumarolic Gases

OHBA T.

Bull. Volcanol. Soc. Japan   42 ( 1 )   1 - 15   1997

Hydrothermal System of the Kirishima Volcanic Area Inferred from the Chemical and Isotopic Composition of Spring Waters and fumarolic gases

T.Ohba, K.Nogami, J.Hirabayashi

Bull. Volcanol. Soc. Japan   42 ( 1 )   1 - 15   1997

Chemical Composition of Volcanic Gases Associated with the 1991-1992 Activity of Shinmoe-dake, Kirishima Volcanoes, Japan

HIRABAYASHI Jun-ichi, OHBA Takeshi, NOGAMI Kenji

Bulletin of the Volcanological Society of Japan   41 ( 6 )   263 - 267   1996.12

Seismic Velocity Structure Beneath Kirishima Volcanoes with Differential Analysis of Explosion Experiment

TUTUI Tomoki, KAGIYAMA Tsuneomi, MIKADA Hitoshi, MORITA Yuichi, MATSUSHIMA Takeshi, IGUCHI Masato, OIKAWA Jun, YAMAOKA Koshun, KUMAGAI Hiroyuki, NISHIMURA Yuichi, MIYAMACHI Hiroki, WATANABE Toru, NISHIMURA Takeshi, TAKAGI Akimichi, YAMAMOTO Keigo, HAMAGUCHI Hiroyuki, OKADA Hiromu, MAEKAWA Tokumitsu, OSHIMA Hiromitsu, UEKI Sadato, HASHIMOTO Keiichi, NIDA Koichi, SHIGEHARA Satoshi, NAKAMICHI Haruhisa, SHIOMI Kastuhiko, NAKAHARA Hisashi, AOKI Shigeki, AOCHI Hideo, IDA Yoshiaki, WATANABE Hidefumi, ONIZAWA Shin-ya, OSADA Noboru, GYODA Noriya, TSUJI Hiroshi, YAMAGUCHI Masaru, MASUTANI Fumio, NISHIDOMI Ippei, INOUE Tomohiro, ITO Wataru, OKUDA Takashi, MIYAJIMA Rikio, SHIBATA Motoei, KITO Tadashi, TSURUGA Kayoko, MAEDA Mitoshi, SHIMIZU Hiroshi, MATSUO Norimichi, UMAKOSHI Kodo, UCHIDA Kazunari, OKUMURA Takashi, SHIBATA Manabu, SUDO Yasuaki, YOSHIKAWA Shin, YAMADA Toshihiro, MORI Takehiko, MATSUMOTO Yoshihiro, TAKAYAMA Testuro, HENDRASTO Muhamad, HIRANO Shuichiro, YAKIWARA Hiroshi, UENO Hiroshi, ISHIHARA Kazuhiko, MORI Hirokazu, HIRABAYASHI Jun-ichi, OBA Takeshi, NOGAMI Kenji, MORI Toshiya, SATO Masaki, TOMONAGA Sadao

Bulletin of the Volcanological Society of Japan   41 ( 5 )   227 - 241   1996.11

Handling of Pt catalyst in H-2-H2O equilibration method for D/H measurement of water

T Ohba, J Hirabayashi

GEOCHEMICAL JOURNAL   30 ( 6 )   373 - 377   1996

DIFFUSIONAL O-18 LOSS FROM INCLUSION WATER IN A NATURAL HYDROTHERMAL QUARTZ FROM THE KANEUCHI TUNGSTEN DEPOSIT, JAPAN

T OHBA, K KAZAHAYA, S MATSUO

GEOCHIMICA ET COSMOCHIMICA ACTA   59 ( 14 )   3039 - 3047   1995.7

EQUILIBRIUM TEMPERATURE AND REDOX STATE OF VOLCANIC GAS AT UNZEN VOLCANO, JAPAN

T OHBA, J HIRABAYASHI, M YOSHIDA

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH   60 ( 3-4 )   263 - 272   1994.5

WATER, HEAT AND CHLORIDE BUDGETS OF THE CRATER LAKE, YUGAMA AT KUSATSU-SHIRANE VOLCANO, JAPAN

T OHBA, J HIRABAYASHI, K NOGAMI

GEOCHEMICAL JOURNAL   28 ( 3 )   217 - 231   1994

73A. Field analysis of volcanic gases with gas chromatograph.(Abstracts of Papers Presented at the Spring Meeting of the Society)

Watanabe H., Sudzuki N., Oba T., Ohsumi T.

Bulletin of the Volcanological Society of Japan. Second series   31 ( 2 )   158 - 159   1986.7

Volcanic hydrothermal system of Mt. Kusatsu-Shirane, Japan hosting the active crater lake Yugama

Magmatic gases, their trip from the mantle to the surface of the Earth, JSPS Asia-Afirica Scinece Platform Program International Seminar AASPP-Misasa  2006 

レーザーラマン分光法による火山ガス組成遠隔観測の試み

日本火山学会２００６年度秋季大会  2006 

三段階で脱ガスした雲仙普賢岳溶岩

日本火山学会２００６年度秋季大会  2006 

火山ガス観測による雲仙普賢岳マグマの脱ガス過程

地球惑星科学関連学会２００５年合同大会  2005 

Cooperation for the geochemical volcano monitoring in Costa Rica

IAVCEI commission on the chemistry of volcanic gases 9th Gas Workshop  2005 

草津白根山における2004 年秋の火山活動

地球惑星科学関連学会２００５年合同大会  2005 

“Killer Lakes” Nyos and Monoun (Cameroon): Assessment of environmental impacts after more than five years of degassing.

2nd International AASPP Seminar, Cameroon Volcanic Line-East African Rift Valley Volcanoes and the Underlying Mantle  2006 

Volcanic hydrothermal system of Mt. Kusatsu-Shirane, Japan hosting the active crater lake Yugama

Magmatic gases, their trip from the mantle to the surface of the Earth, JSPS Asia-Afirica Scinece Platform Program International Seminar AASPP-Misasa  2006 

“Killer Lakes” Nyos and Monoun (Cameroon): Assessment of environmental impacts after more than five years of degassing.

2nd International AASPP Seminar, Cameroon Volcanic Line-East African Rift Valley Volcanoes and the Underlying Mantle  2006 

箱根大涌谷の浅部火山熱水系

日本火山学会２００５年秋季大会  2005 

ニオス湖およびマヌーン湖（カメルーン）－現状と今後

２００５年度日本地球化学会年会  2005 

火山性流体の挙動と火山活動

トレーサーを用いた水循環研究の現状と将来  2005 

火山ガス観測に基くマグマ脱ガスプロセスの解明

特定領域「火山爆発」夏の学校  2005 

The hydrothermal system beneath Owakudani on Hakone volcano, Japan; traced by stable isotopic ratios of H2O

International symposium on isotope science and engineering from basics to applications  2005 

Cooperation for the geochemical volcano monitoring in Costa Rica

IAVCEI commission on the chemistry of volcanic gases 9th Gas Workshop  2005 

The hydrothermal system beneath Owakudani on Hakone volcano, Japan; traced by stable isotopic ratios of H2O

International symposium on isotope science and engineering from basics to applications  2005 

口永良部島における最近の火山ガス組成変化と噴気温度の連続観測

日本火山学会２００５年秋季大会  2005 

火山ガス化学組成から推定される雲仙普賢岳マグマの脱ガス過程

日本火山学会２００５年秋季大会  2005 

Training and teaching to the engineers from developing countries

1998

ニュージーランド，ルアペル火山火口湖の調査

1998

インドネシア,イジェン火山火口湖の調査

1996

Field study on Kawah Ijen Volcano, Indonesia

1996

Elucidation of magmatic and hydrothermal systems of the highly eruptive Taal and Mayon volcanoes

Grant number：16H05651  2016.4 - 2019.3

Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

Nagao Toshiyasu, SASAI Yoichi

Volcanic eruption potential diagnosis by volcanic gas observation

Grant number：15K12485  2015.4 - 2018.3

Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

OHBA Takeshi, YAGUCHI Muga, NISHINO Kana

天然トレーサーによるカメルーン共和国ヤウンデ・ドアラ市における水資源の特性解明

Grant number：14F04331  2014.4 - 2017.3

日本学術振興会  科学研究費助成事業  特別研究員奨励費

大場 武, WIRMVEM MENGNJO, WIRMVEM Mengnjo

Remote sensing for the volcanic fluid by use of back scattering Raman light

Grant number：23656565  2011 - 2013

Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

OHBA Takeshi

カメルーン火口湖ガス災害防止の総合対策と人材育成

2010 - 2015

科学技術振興機構  国際的な科学技術共同研究などの推進 SATREPS 

大場 武

High-time resolution optical observation of auroras in the Canadian arctic

Grant number：19403010  2007 - 2010

Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

OGAWA Tadahiko, SHIOKAWA Kazuo, IEDA Akimasa, NISHITANI Nozomu, HOSOKAWA Keisuke

波長可変ダイオードレーザーによる火山ガス成分のシングルエンド高速観測

Grant number：19654067  2007 - 2009

日本学術振興会  科学研究費助成事業  挑戦的萌芽研究

大場 武

Geochemical approach to estimate the rates of Lakes Nyos and Monoun degassing and the Nyos dam erosion

Grant number：19403014  2007 - 2008

Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

SATAKE Hiroshi, KUSAKABE Minoru, OHBA Takeshi

Japan-Russia-USA joint research of volcanic activity, seismic activity and crustal deformation of Kuril arc

Grant number：17253002  2005 - 2008

Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

NAKAGAWA Mitsuhiro, KASAHARA Minoru, HASGIMOTO Takeshi, TAKAHASHI Hiroaki, NISHIMURA Yuichi, YOSHIMOTO Mitsuhiro, KAZAHAYA Kohei, ISHIZUKA Yoshihiro, KANEKO Takayuki

高出力レーザーラマン分光法による火山ガス遠隔観測実験

Grant number：17031007  2005 - 2006

日本学術振興会  科学研究費助成事業  特定領域研究

大場 武

レーザーラマン分光法による火山ガス組成の遠隔観測

Grant number：16654089  2004 - 2005

日本学術振興会  科学研究費助成事業  萌芽研究

大場 武

Observation and investigation for the formation SPM originates in high temperature volcanic gas

Grant number：15310126  2003 - 2006

Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

OHBA Takeshi