TY - JOUR
T1 - Heterogeneous rheology controlled postseismic deformation of the 2011 Tohoku-Oki earthquake
AU - Muto, Jun
AU - Shibazaki, Bunichiro
AU - Iinuma, Takeshi
AU - Ito, Yoshihiro
AU - Ohta, Yusaku
AU - Miura, Satoshi
AU - Nakai, Yoshihiko
N1 - Publisher Copyright:
©2016. American Geophysical Union. All Rights Reserved.
PY - 2016
Y1 - 2016
N2 - Using two-dimensional finite element modeling, we reproduced the observed postseismic deformation of the 2011 Tohoku-Oki earthquake. Our model, which accounts for the lithosphere-asthenosphere boundary and weak zones beneath volcanoes, was able to reproduce small-scale (<20 km) perturbations in postseismic deformation observed by the dense geodetic network, such as local subsidence around Quaternary volcanoes. The inverted afterslip has a peak at the downdip limit of the main rupture region on the subducting plate interface, consistent with physical predictions. The combination of afterslip and viscoelastic relaxation in a heterogeneous rheology model explains the observations well, even on small scales.
AB - Using two-dimensional finite element modeling, we reproduced the observed postseismic deformation of the 2011 Tohoku-Oki earthquake. Our model, which accounts for the lithosphere-asthenosphere boundary and weak zones beneath volcanoes, was able to reproduce small-scale (<20 km) perturbations in postseismic deformation observed by the dense geodetic network, such as local subsidence around Quaternary volcanoes. The inverted afterslip has a peak at the downdip limit of the main rupture region on the subducting plate interface, consistent with physical predictions. The combination of afterslip and viscoelastic relaxation in a heterogeneous rheology model explains the observations well, even on small scales.
KW - Tohoku-Oki earthquake
KW - geodesy
KW - postseismic deformation
KW - rheology
KW - subduction zone
KW - viscoelastic relaxation
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U2 - 10.1002/2016GL068113
DO - 10.1002/2016GL068113
M3 - Article
AN - SCOPUS:84971320430
VL - 43
SP - 4971
EP - 4978
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 10
ER -