Detection and Analysis of Multiple Seismic Events
TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA LAB
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The authors have tested several methods of analyzing short-period seismic records to detect multiple events. The data were from a pair of chemical explosions at a dam site near Alma Ata, recorded at the Mould Bay, Canada, seismic observatory. The methods evaluated included visual analysis of array beams, multichannel matched filtering, autocorrelation analysis, and cepstral analysis. For matched filtering the seismogram waveforms were used from a seismic event which occurred reasonably close to the Alma Ata site. Measurements using the spectra or the cepstra appear to be more accurate in determining the delay time between the two events. The analysis methods discussed here are generally in good agreement with the announced time between the explosions, and their yield ratio.
- Seismic Detection and Detectors