Determining source parameters of moderate-size earthquakes from regional waveforms

Details Determining source parameters of moderate-size earthquakes from regional waveforms Determining source parameters of moderate-size earthquakes from regional waveforms

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...30..185w&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 30, Issue 2-3, p. 185-196.

Physics

23

Scientific paper

Waveform modeling of the teleseismic long-period body-wave phases of shallow earthquakes has proven quite effective in determining source parameters for events of magnitude larger than six. Unfortunately, these teleseismic phases become too weak for smaller events, and regional data must be used which are generally much more complicated. This is because the crust-mantle system acts as a leaky waveguide and a large number of rays are required to model the observations. In this report we review a procedure for the systematic determination of source parameters from regional body waves. A least-squares inversion technique is used which is based on a cross-correlation of the data and a synthetic seismogram. The synthetic waveforms are a linear combination of those for the three fundamental types of fault. A set of profiles of the synthetic waveforms is presented. Although the synthetic waveforms are generated for a model developed for the western United States, this model seems to be adequate for most continental regions. The inversion is parameterized in terms of fault strike, dip and rake; these parameters are relatively insensitive to small changes in crustal structure. Several examples are presented.

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