利用粘弹性球体位错理论研究2011年日本MW9.0地震引起的震后位移时空变化

Abstract

Abstract: In the present study, we extracted the post-seismic displacements caused by the 2011 Tohoku-Oki M_W9.0 earthquake from GPS observations. The data spans from March 2011 to September 2015. We studied the contributions of afterslip and visco-elastic relaxation on the post-seismic displacements within 4.5 years after the main shock. We updated the software of Tanaka using a segment-summation scheme, improving the computation accuracies in the near-field. We calculated the co-seismic Green functions of the vertical and horizontal displacement at the source depth of 32 km, using the visco-elastic dislocation theory of Tanaka and elastic spherical dislocation theory of Sun, respectively. The results indicate that these two sets of Green functions are consistent with each other. The differences between the two sets of Green functions are within the uncertainty of the computation. This fact confirmed the correctness of our new software. Then we simulated the post-seismic displacements from March 2014 to September 2015, which are mainly caused by the visco-elastic relaxation of the Mantle. Comparing the observed displacements with the simulated ones, we found that the optimal viscosity of the Mantle around the epicenter region is about 7×10¹⁸ Pa ·s.

Key words: Spherical dislocation theory, GPS, 2011 Tohoku-Oki M_W9.0 earthquake, Displacement, Viscosity of the Mantle

CLC Number:

P315.7

LIU Tai,FU Guang-yu,SU Xiao-ning. Post-seismic Displacements Induced by the 2011 Tohoku-Oki M_W9.0 Earthquake based on Visco-elastic Spherical Dislocation Theory[J]. EARTHQUAKE, 2017, 37(3): 1-11.

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Post-seismic Displacements Induced by the 2011 Tohoku-Oki M_W9.0 Earthquake based on Visco-elastic Spherical Dislocation Theory

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Post-seismic Displacements Induced by the 2011 Tohoku-Oki MW9.0 Earthquake based on Visco-elastic Spherical Dislocation Theory

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Post-seismic Displacements Induced by the 2011 Tohoku-Oki M_W9.0 Earthquake based on Visco-elastic Spherical Dislocation Theory