Determination of Seismic Source Parameters from Long-Period Teleseismic Waves.

摘要

Spectral-fitting procedures are applied to teleseismic surface wave data for determining seismic source parameters,especially depth. From an examination of theoretical Rayleigh and Love wave spectra as a function of source structure,significant variation of the spectra can result from differences of gross tectonic structure in most cases. For very shallow events (less than 5km),though,the effect of source structure is minimal. Seven Eurasian events are analyzed for source mechanisms. For those with known depth from bodywave phases,knowledge of the source region crustal structure is crucial to obtain focal depth agreement from spectral fitting. These source structures were then applied to events in the same region with no independent depth estimate. (Modified author abstract)