TY - JOUR
T1 - Stress buildup and drop in inland shallow crust caused by the 2011 Tohoku-oki earthquake events
AU - Sakaguchi, Kiyotoshi
AU - Yokoyama, Tatsuya
AU - Lin, Weiren
AU - Watanabe, Noriaki
N1 - Funding Information:
We would like to thank Editor and the three anonymous reviewers for their constructive comments, which helped to improve the manuscript. The authors are grateful to Dr. Q. Bletery for providing the stress drop data. We are grateful to Mr. Ryuzo Orita for his support and encouragement. The study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI (grant numbers 23360399, 26289346, 25000009 and 16H04065).
Publisher Copyright:
© 2017 The Author(s).
PY - 2017/12/1
Y1 - 2017/12/1
N2 - To examine the change in stress between before and after the Tohoku-oki Mw9.0 earthquake, we performed stress measurements after the earthquake in the Kamaishi mine in Iwate prefecture in northern Japan, located near the northern termination of the mainshock rupture, following previous measurements before the earthquake in the same mine. The results showed that the magnitudes of the three-dimensional principal stresses and the vertical stress drastically increased after the mainshock and, at 1 year after the earthquake, were more than double those before the earthquake. The principal stress magnitudes then decreased with time and returned to almost pre-earthquake levels at about 3 years after the earthquake. These changes can be interpreted in terms of coseismic rupture of the mainshock and the occurrence of aftershocks in the Sanriku-oki low-seismicity region (SLSR), where the Kamaishi mine is located. The drastic increase in stress suggests that the SLSR may act as a barrier to further rupture propagation.
AB - To examine the change in stress between before and after the Tohoku-oki Mw9.0 earthquake, we performed stress measurements after the earthquake in the Kamaishi mine in Iwate prefecture in northern Japan, located near the northern termination of the mainshock rupture, following previous measurements before the earthquake in the same mine. The results showed that the magnitudes of the three-dimensional principal stresses and the vertical stress drastically increased after the mainshock and, at 1 year after the earthquake, were more than double those before the earthquake. The principal stress magnitudes then decreased with time and returned to almost pre-earthquake levels at about 3 years after the earthquake. These changes can be interpreted in terms of coseismic rupture of the mainshock and the occurrence of aftershocks in the Sanriku-oki low-seismicity region (SLSR), where the Kamaishi mine is located. The drastic increase in stress suggests that the SLSR may act as a barrier to further rupture propagation.
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U2 - 10.1038/s41598-017-10897-8
DO - 10.1038/s41598-017-10897-8
M3 - Article
C2 - 28860648
AN - SCOPUS:85028653548
SN - 2045-2322
VL - 7
JO - Scientific Reports
JF - Scientific Reports
IS - 1
M1 - 10242
ER -