Prestate of Stress and Fault Behavior During the 2016 Kumamoto Earthquake (M7.3)

Satoshi Matsumoto, Yusuke Yamashita, Manami Nakamoto, Masahiro Miyazaki, Shinichi Sakai, Yoshihisa Iio, Hiroshi Shimizu, Kazuhiko Goto, Tomomi Okada, Mako Ohzono, Toshiko Terakawa, Masahiro Kosuga, Masayuki Yoshimi, Youichi Asano

研究成果: ジャーナルへの寄稿記事

2 引用 (Scopus)

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.

元の言語英語
ページ(範囲)637-645
ページ数9
ジャーナルGeophysical Research Letters
45
発行部数2
DOI
出版物ステータス出版済み - 1 28 2018

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earthquakes
earthquake
slip
fluid pressure
stress distribution
evaluation
stress field
hazards
low pressure
moments
porosity
seismic moment
fault slip
strong motion
fluids
seismic hazard
pore pressure
fluid

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

これを引用

Matsumoto, S., Yamashita, Y., Nakamoto, M., Miyazaki, M., Sakai, S., Iio, Y., ... Asano, Y. (2018). Prestate of Stress and Fault Behavior During the 2016 Kumamoto Earthquake (M7.3). Geophysical Research Letters, 45(2), 637-645. https://doi.org/10.1002/2017GL075725

Prestate of Stress and Fault Behavior During the 2016 Kumamoto Earthquake (M7.3). / Matsumoto, Satoshi; Yamashita, Yusuke; Nakamoto, Manami; Miyazaki, Masahiro; Sakai, Shinichi; Iio, Yoshihisa; Shimizu, Hiroshi; Goto, Kazuhiko; Okada, Tomomi; Ohzono, Mako; Terakawa, Toshiko; Kosuga, Masahiro; Yoshimi, Masayuki; Asano, Youichi.

:: Geophysical Research Letters, 巻 45, 番号 2, 28.01.2018, p. 637-645.

研究成果: ジャーナルへの寄稿記事

Matsumoto, S, Yamashita, Y, Nakamoto, M, Miyazaki, M, Sakai, S, Iio, Y, Shimizu, H, Goto, K, Okada, T, Ohzono, M, Terakawa, T, Kosuga, M, Yoshimi, M & Asano, Y 2018, 'Prestate of Stress and Fault Behavior During the 2016 Kumamoto Earthquake (M7.3)', Geophysical Research Letters, 巻. 45, 番号 2, pp. 637-645. https://doi.org/10.1002/2017GL075725
Matsumoto, Satoshi ; Yamashita, Yusuke ; Nakamoto, Manami ; Miyazaki, Masahiro ; Sakai, Shinichi ; Iio, Yoshihisa ; Shimizu, Hiroshi ; Goto, Kazuhiko ; Okada, Tomomi ; Ohzono, Mako ; Terakawa, Toshiko ; Kosuga, Masahiro ; Yoshimi, Masayuki ; Asano, Youichi. / Prestate of Stress and Fault Behavior During the 2016 Kumamoto Earthquake (M7.3). :: Geophysical Research Letters. 2018 ; 巻 45, 番号 2. pp. 637-645.
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