Correlation between Coulomb stress imparted by the 2011 Tohoku-Oki earthquake and seismicity rate change in Kanto, Japan

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Title:	Correlation between Coulomb stress imparted by the 2011 Tohoku-Oki earthquake and seismicity rate change in Kanto, Japan
Authors:	佐竹健治;Ishibe, Takeo;Satake, Kenji;Sakai, Shin'ichi;Shimazaki, Kunihiko;Tsuruoka, Hiroshi;Yokota, Yusuke;Nakagawa, Shigeki;Hirata, Naoshi
Contributors:	地球科學學院地球科學學系
Date:	2015-01-01
Issue Date:	2026-04-23 11:30:40 (UTC+8)
Publisher:	Oxford University Press;Oxford University Press (OUP)
Abstract:	摘要： We studied the seismicity rate increase in the Kanto region around Tokyo following the 2011 Tohoku-Oki earthquake (M w 9.0) to examine whether this increase was correlated with the static increases in the Coulomb failure function (ΔCFF) of the Tohoku-Oki earthquake sequence. Because earthquakes in the Kanto region exhibit various focal mechanisms, the receiver faults for the ΔCFF were assumed to be the focal mechanism solutions for nearly 19 000 earthquakes that previously occurred. Our results showed that the number of earthquakes for which the mechanism solutions had a positive ΔCFF (∼12 000) is much larger than those that had a negative ΔCFF (∼2000). Comparison of the ΔCFF values for earthquakes before and after the Tohoku-Oki earthquake showed that the latter had more positive values; this supports the hypothesis that the coseismic stress change transferred from the Tohoku-Oki earthquake sequence is the major contributing factor to the increased seismicity rate in the Kanto region. 其他題名： Geophys. J. Int 出版者： Oxford University Press (OUP) 出版日期： 2015-04-01 出處： Geophysical Journal International, 2015-04, Vol.201 (1), p.112-134 資源來源： Oxford Journals Open Access Collection 版權： The Authors 2015. Published by Oxford University Press on behalf of The Royal Astronomical Society. 2015 識別號： ISSN: 0956-540X 識別號： ISSN: 1365-246X 識別號： EISSN: 1365-246X 識別號： DOI: 10.1093/gji/ggv001
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