Presentations -
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火山灰に含まれる硫黄鉱物の存在量と同位体組成の経時変化 - 阿蘇火山 2021 年 10 月噴火火山灰試料の例 -
平田 碧・大場 司・井村 匠・ 高橋亮平・Pearlyn Cabarubias Manalo・長井雅史・佐藤比奈子・池田柾道
日本火山学会 (鹿児島) 2023.10 - 2023.10 日本火山学会
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西岩手カルデラ中央火口丘形成期のマグマの分化作用
池田柾道・大場 司
日本火山学会 (鹿児島) 2023.10 - 2023.10 日本火山学会
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Characteristics and origins of erupted volcanic ash particles: Insights from maar complex deposits at Lamongan Volcanic Field, East Java, Indonesia
Andriansyah Gurusinga, Tsukasa Ohba
IAVCEI (Rotorua) 2023.02 - 2023.02
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Characteristics of pyroclastic ash fall deposits: the pre-historical explosive eruption of Ciremai volcano, West Java, Indonesia
Wildan Nur Hamzah, Tsukasa Ohba, Andriansyah Gurusinga, Jananda N. Indriyanto, Mirzam Abdurrachman, Idham A. Kurniawan
IAVCEI (Rotorua) 2023.02 - 2023.02
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(entry) Zircon U-Pb ages of volcanic rocks from Gongozaki - Akashima, northwestern coast of Oga Peninsula, northeast Japan
CHIBA Akira, AOKI Shogo, KON Yoshiaki, IKEDA Masamichi, HIRATA Aoi, Kikuchi Eimi, Ohba Tsukasa
Annual Meeting of the Geological Society of Japan 2023 - 2023 The Geological Society of Japan
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Batik lava: an unusual surface structure on a latitic lava flow
T Ohba, WN Hamuzah, MLA Moktikanana, MS Adiva, YA Prasetya, M. Abdurrachman
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2023 - 2023 The Volcanological Society of Japan
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Eruption sequence and evolution of magma plumbing system at Saruana lava, Chokai volcano
Kikuchi Eimi, Ohba Tsukasa
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2023 - 2023 The Volcanological Society of Japan
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Magmatic differentiation in the West-Iwate Caldera Central Cone Stage
IKEDA Masamichi, OHBA Tsukasa
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2023 - 2023 The Volcanological Society of Japan
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Changes of the amounts and sulfur isotope compositions of sulfur minerals in volcanic ash
Hirata Aoi, Ohba Tsukasa, Imura Takumi, Takahashi Ryohei, Cabarubias Manalo Pearlyn, Nagai Masashi, Sato Hinako, Ikeda Masamichi
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2023 - 2023 The Volcanological Society of Japan
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Inverse crystallization order of phenocrysts in high-Mg basalt from Ryozen Formation, Fukushima prefecture
大場 司・安藤瞬也
Japan Geoscience Union (Online) 2021 Meeting (Online) 2021.06 - 2021.06 Japan Geoscience Union (Online)
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Explosive eruption sequence after the 2.5 ka Kisakata Debris Avalanche at Chokai volcano
Endo Masahiro, Ohba Tsukasa, Koizumi Nobuhiro, Ban Masao, Imura Takumi, Minami Yusuke, Nakagawa Mitsuhiro
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2021 - 2021 The Volcanological Society of Japan
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Unpredictable Hazardous Volcanic Activities in Japan, Indonesia, and Elsewhere
Tsukasa Ohba [Invited]
5th International Conference of Geological Engineering Faculty Universitas Padjajaran (オンライン) 2020.11 - 2020.11 UNPAD
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Crystal-size distribution and micro-textures variation of Holocene volcanic products from the last 2000 years eruption of Kelud volcano, Indonesia: an apporach to understand the conduit dynamics
Jananda Nuralam Indriyanto, Tsukasa Ohba, Takashi Hoshide, Mirzam Abdurrachmen
JpGU-AGU meeting (Online) 2020.07 - 2020.07 JPGU, -AGU
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Deep crystallization of tholeiite melt: insights from Mangao Basalt, Palawan, Philippines
James Cesar Avisado Refran, Tsukasa Ohba, Carlo Arcilla, Takashi Hoshide, Ma, Ines Prsana Balangue-Tarriela
JPGU-AGU 2020 (Online) 2020.07 - 2020.07 JpGU-AGU
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Petrological and geochemical analysis on non-juvenile lithics from phreatic/hydrothermal eruptions
Tsukasa Ohba, Takumi Imura, Syahreza Angkasa, Yusuke Minami [Invited]
International Workshop on the mechanism of Phreatic Eruption (箱根町) 2020.01 - 2020.01 神奈川県温泉地学研究所
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The 2.5 ka eruption accompanying the sector collapse at Chokai volcano
Ohba Tsukasa, Nakagawa Mitsuhiro, Hayashi Shintaro, Kondo Keita, Endo Masahiro, Hara Yuto, Kawai Kojiro, Ban Masao, Imura Takumi, Minami Yusuke
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2020 - 2020 The Volcanological Society of Japan
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Stratigraphy and Componentry Analysis of the Proximal V olcanic Succession of Tangkuban Parahu V olcano, West Java, Indonesia
Syahreza Angkasa, Tsukasa Ohba, Takumi Imura
2019.09 - 2019.09
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Stratigraphy and petrologic characteristics of eruption rocks in West Chokai caldera, Chokai volcano
Kujime Kosuke, Ban Masao, Hayashi Shintaro, Ohba Tsukasa
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2019 - 2019 The Volcanological Society of Japan
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Craters discovered from the northwest coast of Lake Chokai, western part of Chokai volcano
Hayashi Shintaro, Ban Masao, Ohba Tsukasa
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2019 - 2019 The Volcanological Society of Japan
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吾妻―浄土平火山噴出物に含まれる非本質火山灰の岩石学的特徴
井村 匠・大場 司・堀越賢太
日本火山学会2018年度秋季大会 (秋田大学) 2018.09 - 2018.09 日本火山学会
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東北日本、鳥海山の紀元前466年以降のマグマ供給系の変遷．
伴 雅雄・高橋拓也・佐藤昂徳・林 信太郎・大場 司・新城竜一・西 勇樹
日本火山学会2018年度秋季大会 (秋田大学) 2018.09 - 2018.09 日本火山学会
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Unearthing tephra deposit, and petrological trace of subvolcanic magma dynamics of two active intra-caldera volcanoes north of the Rabaul volcanic complex-Papua New Guinea
Lloyd Singura・大場 司
日本火山学会2018年度秋季大会 (秋田大学) 2018.09 - 2018.09 日本火山学会
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Spatial and Temporal Variations of Tangkil and Rajabasa Volcanoes, Southern Sumatra, Indonesia and Their Lead into Evolution of Magmas since Pliocene.
Reza Firmansyah Hasibuan・大場 司・Mirzam Abdrrachman・星出隆志
日本火山学会2018年度秋季大会 (秋田大学) 2018.09 - 2018.09 日本火山学会
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New insight the tephra-stratigraphy of Mt. Tangkuban Parahu, Indonesia into Holocene eruption history.
Syahreza S. Angkasa・Tsukasa Ohba
日本火山学会2018年度秋季大会 (秋田大学) 2018.09 - 2018.09 日本火山学会
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Understanding the 2014 Initial Eruption of Mount Kelud, Indonesia through the Product Sequences Revealed in the Western Flank.
Astiti Anggoro Wati・Tsukasa Ohba
日本火山学会2018年度秋季大会 (秋田大学) 2018.09 - 2018.09 日本火山学会
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Eruptive products from hydrothermal systems beneath active volcanoes
Tsukasa Ohba, Keita Ito, Takumi Imura, and Yusuke Minami
EGU General Assembly 2018 (Vienna, Austria) 2018.04 - 2018.04 EGU
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Altered ash particles mineralogy from Mt. Tangkuban Parahu volcanic products, Indonesia: constraint on the sub-volcanic hydrothermal system.
Syahreza Angkasa, Tsukasa Ohba, Mirzam Abdurachman, Iwan Setiawan, and Mega Rosana
EGU General Assembly 2018 (Vienna, Austria) 2018.04 - 2018.04 EGU
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Imura Takumi, Ohba Tsukasa, Horikoshi Kenta
Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2018 - 2018 Japan Association of Mineralogical Sciences
This study petrologically investigated non-juvenile ash grains in pyroclastic deposits at Azuma volcano. By bulk XRD analysis, the samples before Az-OA shows the clear X-ray peaks of smectite and kaolin, while samples after Az-OA showed the strong X-ray peaks of plagioclase, pyroxene, and amphibole. Samples of Az-OA are abundant in acidic-altered ash, also contains neutral-altered grains Whereas, the Az-P7 sample is rich in unaltered ash of extremely high crystalline andesite.
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Refran James Cesar, Ohba Tsukasa
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2018 - 2018 The Volcanological Society of Japan
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Singura Lloyd, Ohba Tsukasa
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2018 - 2018 The Volcanological Society of Japan
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HASIBUAN Reza Firmansyah, OHBA Tsukasa, ABDURRACHMAN Mirzam, HOSHIDE Takashi
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2018 - 2018 The Volcanological Society of Japan
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Magma characteristics of Rajabasa volcanic complex inferred from petrological approach
Reza Firmansyah Hasibuan, Tsuksa Ohba, Mirzam abdurrachman, Takashi Hoshide
Joint Convention Malang 2017, Makang, Indonesia 2017.10 - 2017.10
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水蒸気噴火火山灰の組成多様性
大場司・井村匠・伊藤啓太・南裕介
日本火山学会2017年秋季大会 (熊本大学) 2017.09 - 2017.09 日本火山学会
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Volcanic fluids-rock interaction inferred from characteristics of altered minerals in volcanic products at Tokachidake volcano, central Hokkaido, Japan
Takumi Imura, Tsukasa Ohba, and Nakagawa Mitsuhiro
IAVCEI (Portland, US) 2017.08 - 2017.08 IAVCEI
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Interaction between volcanic fluid and magma, inferred from altered volcanic ash particles: examples from arc composite cones in Japan
T, Ohba, T. Imura, K. Ito, Y. Minami
IAVCEI (Portland, US) 2017.08 - 2017.08 IAVCEI
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,Magma characteristics of Rajabasa volcanic complex inferred from petrological approach
Reza Firmansyah Hasibuan, Tsuksa Ohba, Mirzam abdurrachman, Takashi Hoshide
IAVCEI (Portland, US) 2017.08 - 2017.08 IAVCEI
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Volcanic fluids-rock interaction inferred from characteristics of altered minerals in volcanic products at Tokachidake volcano, central Hokkaido, Japan,
T. Imura, M. T. Ohba., Nakagawa
JpGU (幕張) 2017.05 - 2017.05 JpGU
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Occurrence and origin of the kaolin-rich gravelly sediments at Rendaiji of Yuzawa, Akita, Japan
Kano Kazuhiko, Ishiyama Daizo, Oba Tsukasa, Oguchi Takeshi, Fujimoto Yukio
Annual Meeting of the Geological Society of Japan 2017 - 2017 The Geological Society of Japan
<b> [Program canceled for typhoon]</b> Program canceled for typhoon. However, This abstract is quotable and viewable on PDF.
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Component diversity of volcanic ash from phreatic eruptions
Ohba Tsukasa, Imura Takumi, Ito Keita, Minami Yusuke
Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2017 - 2017 Japan Association of Mineralogical Sciences
We observed volcanic ash of phreatic eruptions from Ontake, Tokachi, Kurikoma, and Azuma volcanoes. Various alteration conditions are interpreted from the alteration mineral assemblages. The difference in the alteration mineralogy is related to the frequency of magma eruptions. The volcanoes with high frequencies of magma extrusions tend to discharge the ash with the monotonous mineral assemblages of the low-T advanced argillic alteration, whereas those with low frequencies are related to the assemblages from porphyry-type hydrothermal systems.
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Phenocryst Zoning Patterns Developed during Evolution of Magma Mixing: Case Studies from Northern Honshu and Western Java Arcs
Tsukasa Ohba, Sho Komatsu, Shintaro Hayashi, Masao Ban, Kohei Takayama and Iwan Setiawan
AGU fall meeting (San Francisco) 2014.12 - 2014.12 AGT