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Seismicity controlled by resistivity structure : the 2016 Kumamoto earthquakes, Kyushu Island, Japan

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Title: Seismicity controlled by resistivity structure : the 2016 Kumamoto earthquakes, Kyushu Island, Japan
Authors: Aizawa, Koki Browse this author
Asaue, Hisafumi Browse this author
Koike, Katsuaki Browse this author
Takakura, Shinichi Browse this author
Utsugi, Mitsuru Browse this author
Inoue, Hiroyuki Browse this author
Yoshimura, Ryokei Browse this author
Yamazaki, Ken'ichi Browse this author
Komatsu, Shintaro Browse this author
Uyeshima, Makoto Browse this author
Koyama, Takao Browse this author
Kanda, Wataru Browse this author
Shiotani, Taro Browse this author
Matsushima, Nobuo Browse this author
Hata, Maki Browse this author
Yoshinaga, Tohru Browse this author
Uchida, Kazunari Browse this author
Tsukashima, Yuko Browse this author
Shito, Azusa Browse this author
Fujita, Shiori Browse this author
Wakabayashi, Asuma Browse this author
Tsukamoto, Kaori Browse this author
Matsushima, Takeshi Browse this author
Miyazaki, Masahiro Browse this author
Kondo, Kentaro Browse this author
Takashima, Kanade Browse this author
Hashimoto, Takeshi Browse this author →KAKEN DB
Tamura, Makoto Browse this author
Matsumoto, Satoshi Browse this author
Yamashita, Yusuke Browse this author
Nakamoto, Manami Browse this author
Shimizu, Hiroshi Browse this author
Keywords: Magnetotellurics
Resistivity structure
2016 Kumamoto earthquake
Futagawa fault
Hinagu fault
Structural control
Aso volcano
Kuju volcano
Tsurumi volcano
Median Tectonic Line
Issue Date: 2017
Journal Title: Earth, Planets and Space
Volume: 69
Issue: 1
Start Page: 4
Publisher DOI: 10.1186/s40623-016-0590-2
Abstract: 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.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 橋本 武志

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