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タイトル	en Seismicity controlled by resistivity structure : the 2016 Kumamoto earthquakes, Kyushu Island, Japan
作成者	en Aizawa, Koki en Asaue, Hisafumi en Koike, Katsuaki en Takakura, Shinichi en Utsugi, Mitsuru en Inoue, Hiroyuki en Yoshimura, Ryokei en Yamazaki, Ken'ichi en Komatsu, Shintaro en Uyeshima, Makoto en Koyama, Takao en Kanda, Wataru en Shiotani, Taro en Matsushima, Nobuo en Hata, Maki en Yoshinaga, Tohru en Uchida, Kazunari en Tsukashima, Yuko en Shito, Azusa en Fujita, Shiori en Wakabayashi, Asuma en Tsukamoto, Kaori en Matsushima, Takeshi en Miyazaki, Masahiro en Kondo, Kentaro en Takashima, Kanade en Hashimoto, Takeshi NRID 1000070283588 en Tamura, Makoto en Matsumoto, Satoshi en Yamashita, Yusuke en Nakamoto, Manami en Shimizu, Hiroshi
アクセス権	open access
権利情報	https://creativecommons.org/licenses/by/4.0/ en Creative Commons Attribution 4.0 International
主題	Other en Magnetotellurics Other en Resistivity structure Other en 2016 Kumamoto earthquake Other en Futagawa fault Other en Hinagu fault Other en Structural control Other en Aso volcano Other en Kuju volcano Other en Tsurumi volcano Other en Median Tectonic Line NDC 453
内容注記	Abstract en The M JMA 7.3 Kumamoto earthquake that occurred at 1:25 JST on April 16, 2016, not only triggered aftershocks in the vicinity of the epicenter, but also triggered earthquakes that were 50–100 km away from the epicenter of the main shock. The active seismicity can be divided into three regions: (1) the vicinity of the main faults, (2) the northern region of Aso volcano (50 km northeast of the mainshock epicenter), and (3) the regions around three volcanoes, Yufu, Tsurumi, and Garan (100 km northeast of the mainshock epicenter). Notably, the zones between these regions are distinctively seismically inactive. The electric resistivity structure estimated from one-dimensional analysis of the 247 broadband (0.005–3000 s) magnetotelluric and telluric observation sites clearly shows that the earthquakes occurred in resistive regions adjacent to conductive zones or resistive-conductive transition zones. In contrast, seismicity is quite low in electrically conductive zones, which are interpreted as regions of connected fluids. We suggest that the series of the earthquakes was induced by a local accumulated stress and/or fluid supply from conductive zones. Because the relationship between the earthquakes and the resistivity structure is consistent with previous studies, seismic hazard assessment generally can be improved by taking into account the resistivity structure. Following on from the 2016 Kumamoto earthquake series, we suggest that there are two zones that have a relatively high potential of earthquake generation along the western extension of the MTL.
日付	Issued2017
言語	eng
資源タイプ	journal article
出版タイプ	VoR
資源識別子	HDL http://hdl.handle.net/2115/67561
関連	isIdenticalTo DOI https://doi.org/10.1186/s40623-016-0590-2
収録誌情報	EISSN 1880-5981 en Earth, Planets and Space 巻69 号1 開始ページ4
ファイル	fulltext Earth Planets Space69-1_4.pdf 4.5 MB (application/pdf) Issued2017
コンテンツ更新日時	2023-07-26