Approximate retrieval of the point source in anisotropic media: numerical modelling by indirect parametrization of the source

Details Approximate retrieval of the point source in anisotropic media: numerical modelling by indirect parametrization of the source Approximate retrieval of the point source in anisotropic media: numerical modelling by indirect parametrization of the source

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.143..700s&link_type=abstract

Geophysical Journal International, Volume 143, Issue 3, pp. 700-708.

Astronomy and Astrophysics

Astronomy

9

Anisotropy, Inversion, Source Parameters

Scientific paper

We propose an approximate approach to the waveform inversion of the mechanism and source time function of a point earthquake source buried in an anisotropic medium. We have modified the INPAR (INdirect PARametrization) inversion algorithm used for isotropic media by taking into account that the arrival times of waves propagating in an anisotropic medium differ from those propagating in an isotropic medium. All other effects caused by anisotropy are neglected. In the waveform inversion, we simply use the isotropic Green's function for constructing synthetic seismograms, and match them with anisotropic waveforms. To estimate the accuracy of this approach, we performed a series of numerical experiments covering various station configurations, ranging from very dense to sparse, and exploiting either only P, or both P and S waves. Treating anisotropy in this simplified way is mainly projected onto additional spurious moment tensor components, whilst the double-couple orientation and the source time function remain largely unaffected. It appears that even fairly high anisotropy (24 per cent in P waves and 11 per cent in S waves) can be treated by this approach without fatal loss of information about the source.

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