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タイトル: | Prestate of Stress and Fault Behavior During the 2016 Kumamoto Earthquake (M7.3) |
著者: | Matsumoto, Satoshi Yamashita, Yusuke https://orcid.org/0000-0002-5347-5216 (unconfirmed) Nakamoto, Manami Miyazaki, Masahiro Sakai, Shinichi Iio, Yoshihisa https://orcid.org/0000-0003-0808-0757 (unconfirmed) Shimizu, Hiroshi Goto, Kazuhiko Okada, Tomomi Ohzono, Mako Terakawa, Toshiko Kosuga, Masahiro Yoshimi, Masayuki Asano, Youichi |
著者名の別形: | 山下, 裕亮 宮﨑 , 真大 飯尾, 能久 |
キーワード: | Kumamoto earthquake stress field fault |
発行日: | 28-Jan-2018 |
出版者: | American Geophysical Union (AGU) |
誌名: | Geophysical Research Letters |
巻: | 45 |
号: | 2 |
開始ページ: | 637 |
終了ページ: | 645 |
抄録: | Fault behavior during an earthquake is controlled by the state of stress on the fault. Complex coseismic fault slip on large earthquake faults has recently been observed by dense seismic networks, which complicates strong motion evaluations for potential faults. Here we show the three‐dimensional prestress field related to the 2016 Kumamoto earthquake. The estimated stress field reveals a spatially variable state of stress that forced the fault to slip in a direction predicted by the “Wallace and Bott Hypothesis.” The stress field also exposes the pre‐condition of pore fluid pressure on the fault. Large coseismic slip occurred in the low‐pressure part of the fault. However, areas with highly pressured fluid also showed large displacement, indicating that the seismic moment of the earthquake was magnified by fluid pressure. These prerupture data could contribute to improved seismic hazard evaluations. |
著作権等: | ©2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. |
URI: | http://hdl.handle.net/2433/230618 |
DOI(出版社版): | 10.1002/2017GL075725 |
出現コレクション: | 学術雑誌掲載論文等 |
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