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Detection and analysis of multiple seismic events

SEISMIC DATA LABORATORY ALEXANDRIA LABORATORIES TELEDYNE GEOTECH, ALEXANDRIA, VIRGINIA 22313
THE PENNSYLVANIA STATE UNIVERSITY, UNIVERSITY PARK, PENNSYLVANIA 16801

Abstract

We compare several methods of analyzing short-period seismic records with the purpose of detecting multiple events. The data used were from a pair of chemical explosions at a dam site near Alma Ata, recorded at the seismic observatory at Mould Bay, Canada. The methods evaluated include visual analysis of the array-beam sums, multichannel matched filtering, autocorrelation analysis, and cepstral analysis. For matched filtering we used the recorded wave forms from a seismic event which occurred reasonably close to the Alma Ata site. Measurements using the spectra or the cepstra appear to be most accurate in determining the delay time between the two events. The analysis methods discussed here generally give results which are in good agreement with the announced time between the explosion and announced yield ratio.