Utility of Tsai's Method for Seismic Discrimination
Final technical rept. 1 Jul 1971-30 Sep 1972
TEXAS INSTRUMENTS INC DALLAS SERVICES GROUP
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An automatic spectral-fitting procedure based on a simple least- squares error criterion is devised for determining the source parameters of earthquakes from surface wave data. When this procedure is supplemented by the complex cepstrum technique for removing the spectral modulations due to multipath interference, results are significantly improved. Rayleigh and Love wave spectral data recorded by the VLPE network and the NORSAR long-period array for fifty-one earthquakes in the Eurasian continent are processed by this procedure. The results are discussed on a regional basis. It is found that the surface wave spectral characteristics may vary even among earthquakes located in essentially the same epicentral region. However, the variations are not random but follow certain distinct patterns. With proper data coverage the focal depths of relatively small earthquakes can be estimated within a 20-km range by employing jointly the automatic spectral-fitting procedure and the complex cepstrum technique.
- Seismic Detection and Detectors