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Treatment of discontinuities inside Earth models:Effects on computed coseismic deformations

Earth and Planetary Physics 2021年第1期5卷 90-104页

作者： Jie Dong Gabriele Cambiotti HanJiang Wen Roberto Sabadini WenKe Sun Chinese Academy of Surveying and Mapping Beijing 100036China Department of Earth Sciences University of MilanMilano 20133Italy Key Laboratory of Computational Geodynamics University of Chinese Academy of SciencesBeijing 100049China

In this paper,we study how coseismic deformations calculated in 1066 Earth models are affected by how the models treat Earth *** the results of applying models 1066A(continuous)and 1066B(discontinuous),we find that the difference in Love numbers of strike-slip and horizontal tensile sources are bigger than dip-slip and vertical tensile *** collectively,discontinuities have major effects on Green’s functions of four independent *** the near-field coseismic deformations of the 2013 Okhotsk earthquake(Mw 8.3),the overall differences between theoretical calculations in vertical displacement,geoid,and gravity changes caused by discontinuities are 10.52 percent,9.07 percent and 6.19 percent,with RMS errors of 0.624 mm,0.029 mm,and 0.063μGal,*** difference in far-field displacements is small,compared with GPS data,and we can neglect this *** the shallow earthquake,2011 Tohoku-Oki earthquake(Mw 9.0),the differences in near-field displacements are 0.030 m(N-S),0.093 m(E-W),and 0.025 m(up-down)in our study area with the ARIA slip model,which gives results closer to GPS data than those from the USGS *** difference in vertical displacements and gravity changes on the Earth’s surface caused by discontinuities are larger than 10 *** difference in the theoretical gravity changes at spatially fixed points truncated to degrees 60,as required by GRACE data,is 0.0016μGal and the discrepancy is 11 percent,with the theoretical spatial gravity changes from 1066B closer to observations than from *** results show that an Earth model with discontinuities in the medium has a large effect on the calculated coseismic deformations.

关键词： discontinuities Earth model coseismic deformations GPS GRACE

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