Relative Waveform Inversion
Semi-Annual technical rept. 1 Nov-30 Apr 1980
SIERRA GEOPHYSICS INC REDMOND WA
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A relative waveform inversion method has been developed which determines models that correctly predict waveform changes in a set of observed seismograms. By modeling changes in waveforms rather than absolute waveforms, a number of relatively poorly determined quantities, such as receiver function and Q, may be eliminated from the problem and greater resolution of key model parameters obtained. The method has been applied to the estimation of overall amplitude, pP amplitude and pP delay time for a suite of seven presumed underground nuclear explosions in the Eastern Kazakh region. Events divide into two populations based on pP amplitude, with events having small pP amplitude possibly showing indications of azimuthal variation in pP. The existence of events with radically different pP amplitudes suggest that biases may exist in current relative yield estimation techniques, an effect which is corrected for in the relative waveform method.
- Seismic Detection and Detectors