Effects of induced stress on seismic forward modelling and inversion

Jeroen Tromp, Jeannot Trampert

Research output: Contribution to journalArticle

4 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)851-867
Number of pages17
JournalGeophysical Journal International
Volume213
Issue number2
DOIs
StatePublished - May 1 2018

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Keywords

  • Computational seismology
  • Elasticity and anelasticity
  • Equations of state
  • High-pressure behaviour
  • Theoretical seismology
  • Wave propagation

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