Abstract
The 2011 moment magnitude 9.0 Tohoku-Oki earthquake produced a maximum coseismic slip of more than 50 meters near the Japan trench, which could result in a completely reduced stress state in the region. We tested this hypothesis by determining the in situ stress state of the frontal prism from boreholes drilled by the Integrated Ocean Drilling Program approximately 1 year after the earthquake and by inferring the pre-earthquake stress state. On the basis of the horizontal stress orientations and magnitudes estimated from borehole breakouts and the increase in coseismic displacement during propagation of the rupture to the trench axis, in situ horizontal stress decreased during the earthquake. The stress change suggests an active slip of the frontal plate interface, which is consistent with coseismic fault weakening and a nearly total stress drop.
Original language | English (US) |
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Pages (from-to) | 687-690 |
Number of pages | 4 |
Journal | Science |
Volume | 339 |
Issue number | 6120 |
DOIs | |
State | Published - Feb 8 2013 |
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Stress state in the largest displacement area of the 2011 Tohoku-Oki earthquake. / Lin, Weiren; Conin, Marianne; Moore, J. Casey; Chester, Frederick M.; Nakamura, Yasuyuki; Mori, James J.; Anderson, Louise; Brodsky, Emily E.; Eguchi, Nobuhisa; Cook, Becky; Jeppson, Tamara; Wolfson-Schwehr, Monica; Sanada, Yoshinori; Saito, Saneatsu; Kido, Yukari; Hirose, Takehiro; Behrmann, Jan H.; Ikari, Matt; Ujiie, Kohtaro; Rowe, Christie; Kirkpatrick, James; Bose, Santanu; Regalla, Christine; Remitti, Francesca; Toy, Virginia; Fulton, Patrick; Mishima, Toshiaki; Yang, Tao; Sun, Tianhaozhe; Ishikawa, Tsuyoshi; Sample, James C; Takai, Ken; Kameda, Jun; Toczko, Sean; Maeda, Lena; Kodaira, Shuichi; Hino, Ryota; Saffer, Demian.
In: Science, Vol. 339, No. 6120, 08.02.2013, p. 687-690.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Stress state in the largest displacement area of the 2011 Tohoku-Oki earthquake
AU - Lin, Weiren
AU - Conin, Marianne
AU - Moore, J. Casey
AU - Chester, Frederick M.
AU - Nakamura, Yasuyuki
AU - Mori, James J.
AU - Anderson, Louise
AU - Brodsky, Emily E.
AU - Eguchi, Nobuhisa
AU - Cook, Becky
AU - Jeppson, Tamara
AU - Wolfson-Schwehr, Monica
AU - Sanada, Yoshinori
AU - Saito, Saneatsu
AU - Kido, Yukari
AU - Hirose, Takehiro
AU - Behrmann, Jan H.
AU - Ikari, Matt
AU - Ujiie, Kohtaro
AU - Rowe, Christie
AU - Kirkpatrick, James
AU - Bose, Santanu
AU - Regalla, Christine
AU - Remitti, Francesca
AU - Toy, Virginia
AU - Fulton, Patrick
AU - Mishima, Toshiaki
AU - Yang, Tao
AU - Sun, Tianhaozhe
AU - Ishikawa, Tsuyoshi
AU - Sample, James C
AU - Takai, Ken
AU - Kameda, Jun
AU - Toczko, Sean
AU - Maeda, Lena
AU - Kodaira, Shuichi
AU - Hino, Ryota
AU - Saffer, Demian
PY - 2013/2/8
Y1 - 2013/2/8
N2 - The 2011 moment magnitude 9.0 Tohoku-Oki earthquake produced a maximum coseismic slip of more than 50 meters near the Japan trench, which could result in a completely reduced stress state in the region. We tested this hypothesis by determining the in situ stress state of the frontal prism from boreholes drilled by the Integrated Ocean Drilling Program approximately 1 year after the earthquake and by inferring the pre-earthquake stress state. On the basis of the horizontal stress orientations and magnitudes estimated from borehole breakouts and the increase in coseismic displacement during propagation of the rupture to the trench axis, in situ horizontal stress decreased during the earthquake. The stress change suggests an active slip of the frontal plate interface, which is consistent with coseismic fault weakening and a nearly total stress drop.
AB - The 2011 moment magnitude 9.0 Tohoku-Oki earthquake produced a maximum coseismic slip of more than 50 meters near the Japan trench, which could result in a completely reduced stress state in the region. We tested this hypothesis by determining the in situ stress state of the frontal prism from boreholes drilled by the Integrated Ocean Drilling Program approximately 1 year after the earthquake and by inferring the pre-earthquake stress state. On the basis of the horizontal stress orientations and magnitudes estimated from borehole breakouts and the increase in coseismic displacement during propagation of the rupture to the trench axis, in situ horizontal stress decreased during the earthquake. The stress change suggests an active slip of the frontal plate interface, which is consistent with coseismic fault weakening and a nearly total stress drop.
UR - http://www.scopus.com/inward/record.url?scp=84873514476&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84873514476&partnerID=8YFLogxK
U2 - 10.1126/science.1229379
DO - 10.1126/science.1229379
M3 - Article
C2 - 23393262
AN - SCOPUS:84873514476
VL - 339
SP - 687
EP - 690
JO - Science
JF - Science
SN - 0036-8075
IS - 6120
ER -