Kagoshima University · Graduate School of Science and Engineering · 特任教授

Research keywords地震・地下構造・Valcanology・Seismology・火山

This is a public-data preview. Personalized fit, contact angles, and saved workflows require sign-in.

• 宮町 宏樹, 小林 励司, 八木原 寛 . 2020年8月の若尊カルデラ海域の短時間群発地震活動 . 火山67 ( 4 ) 471 - 478 2022年12月 詳細を見る 記述言語： 日本語 出版者・発行元： 特2020 · 記述言語： 日本語 出版者・発行元： 特定非営利活動法人 日本火山学会 DOI： 10.18940/kazan.67.4_471
• 高橋浩晃; 青山裕; 大園真子; 田中良; 伊藤ちひろ; 渡邉早姫; 松島健; 山下裕亮; 宮町宏樹; 奥山哲; ゴルディエフ, エフゲニー; ムラビヨフ, ヤロスラフ; マグースキン, キリル; マリック, ナタリヤ; ミノロフ, イワン; チェブロフ, ダニラ2019 · 記述言語： 日本語 掲載種別： 研究論文（大学，研究機関等紀要）
• Yuki Susukida,Kei Katsumata, Masayoshi Ichiyanagi, Mako Ohzono, Hiroshi Aoyama,Ryo Tanaka, Masamitsu Takada, Teruhiro Yamaguchi, Kazumi Okada, Hiroaki Takahashi, Shin’ichi Sakai,Satoshi Matsumoto, Tomomi Okada, Toru Matsuzawa, Hiroki Miyamachi, Shuichiro Hirano,Yoshiko Yamanaka, Shinichiro Horikawa, Masahiro Kosuga, Hiroshi Katao, Yoshihisa Iio, Airi Nagaoka,Noriko Tsumura, Tomotake Ueno and The Group for the Aftershock Observations of the 2018 Hokkaido2018 · 記述言語： 英語 掲載種別： 研究論文（学術雑誌）
• Miyamachi H., Yakiwara H., Kobayashi R., Hirano S., Kubo T., Souda M., Sakao K., Unno N., Matsushima T., Uchida K., Miyamachi R., Isoda K., Teguri Y., Kamiya Y., Triahadini A., Shimizu H., Katao H., S2017 · 記述言語： 日本語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Earth, Planets and Space The Aira caldera, located in southern Kyushu, Japan, originally formed 100 ka, and its current shape reflects the more recent 30 ka caldera-forming eruptions (hereafter, called the AT eruptions). This study aimed to delineate the detailed two-dimensional (2D) seismic velocity structure of the Aira caldera down to approximately 15 km, by means of the travel-time tomography analysis of the seismic profile across the caldera acquired in 2017 and 2018. A substantial structural difference in thickness in the subsurface low-velocity areas in the Aira caldera between the eastern and western sides, suggest that the Aira caldera comprises at least two calderas, identified as the AT and Wakamiko calderas. The most interesting feature of the caldera structure is the existence of a substantial high-velocity zone (HVZ) with a velocity of more than 6.8 km/s at depths of about 6–11 km beneath the central area of the AT caldera. Because no high ratio of P- to S-wave velocity zones in the depth range were detected from the previous three-dimensional velocity model beneath the AT caldera region, we infer that the HVZ is not an active magma reservoir but comprises a solidified and cool remnant. In addition, a poorly resolved low-velocity zone around 15 km in depth suggests the existence of a deep active magma reservoir. By superimposing the distribution of the known pressure sources derived from the observed ground inflation and the volcanic earthquake distribution onto the 2D velocity model, the magma transportation path in the crust was imaged. This image suggested that the HVZ plays an important role in magma transportation in the upper crust. Moreover, we estimated that the AT magma reservoir in the 30 ka Aira caldera-forming eruptions has the total volume of 490 km3 DRE and is distributed in a depth range of 4–11 km. Graphical Abstract: [Figure not available: see fulltext.] DOI： 10.1186/s40623-023-01919-z Scopus

• 九州地殻内大規模地下構造の推定
• 2011年東北地方太平洋沖地震に関する総合調査
• Seismic Activity and velocity structure in southern Kyushu
• velocity structure in Antarctica

• Official profile
• ORCID