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Effects of induced stress on seismic forward modelling and inversion

Author(s): Tromp, Jeroen; Trampert, Jeannot

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Abstract: We demonstrate how effects of induced stress may be incorporated in seismic modelling and inversion. Our approach is motivated by the accommodation of pre-stress in global seismology. Induced stress modifies both the equation of motion and the constitutive relationship. The theory predicts that induced pressure linearly affects the unstressed isotropic moduli with a slope determined by their adiabatic pressure derivatives. The induced deviatoric stress produces anisotropic compressional and shear wave speeds; the latter result in shear wave splitting. For forward modelling purposes, we determine the weak form of the equation of motion under induced stress. In the context of the inverse problem, we determine induced stress sensitivity kernels, which may be used for adjoint tomography. The theory is illustrated by considering 2-D propagation of SH waves and related Fréchet derivatives based on a spectral-element method.
Publication Date: 23-Jan-2018
Citation: Tromp, Jeroen, and Jeannot Trampert. "Effects of induced stress on seismic forward modelling and inversion." Geophysical Journal International 213, no. 2 (2018): 851-867. doi:10.1093/gji/ggy020.
DOI: doi:10.1093/gji/ggy020
ISSN: 0956-540X
EISSN: 1365-246X
Pages: 851 - 867
Type of Material: Journal Article
Journal/Proceeding Title: Geophysical Journal International
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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