Simultaneous waveform inversion for three-dimensional Earth structure and earthquake source parameters considering a wide range of modal coupling

Details Simultaneous waveform inversion for three-dimensional Earth structure and earthquake source parameters considering a wide range of modal coupling Simultaneous waveform inversion for three-dimensional Earth structure and earthquake source parameters considering a wide range of modal coupling

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.142..539h&link_type=abstract

Geophysical Journal International, Volume 142, Issue 2, pp. 539-550.

Astronomy and Astrophysics

Astronomy

2

Direct Solution Method, Lateral Heterogeneity, Normal Modes, Surface Waves, Toroidal-Spheroidal Coupling, Waveform Inversion

Scientific paper

We perform iterative inversion of long-period seismic waveform data to determine simultaneously the 3-D structure of the upper and uppermost lower mantle and earthquake source parameters. We perform direct inversion of the observed data using the methods of Geller & Hara (1993) and Hara (1997), thus intermediate parameters such as `splitting functions' are not used. We analyse data in the period bands 178-185, 282-299 and 347-376 s using the Direct Solution Method (DSM) to compute synthetic seismograms and their partial derivatives. A wide range of modal coupling is considered in these computations. We conduct numerical experiments that show that neglecting toroidal-spheroidal coupling can significantly bias estimates of 3-D Earth structure for the period band 282-299 s; note that previous studies for this band generally did not consider such coupling. A numerical experiment for the period band 347-376 s suggests that our inversion approach can extract more information on odd angular order structure for the period band 347-376 s than previous techniques.

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