Focal Depth Estimates from Long-Period P-waveform Modeling of Selected Alaskan Teleseisms

Jack Pelton, Boise State University

Abstract

Modeling of long-period far-field P-waveforms from 5.5<_mb(sub)<_6.5 earthquakes in south-central and southeastern coastal Alaska suggests focal depths that in some cases are significantly different from published ISC data. Preliminary results do not indicate any systematic difference between ISC focal depths and those deduced from waveform modeling. The modeling procedure assumes a point double-couple source with a trapezoidal moment rate function, and includes the effects of the direct P, pP, and sP phases (essentially the procedure of Kanamori and Stewart, Physics of the Earth and Planetary Interiors, 11, 312-332, 1976).