Improved Yield Determination and Event Identification Research
Quarterly technical rept. 1 May-31 Jul 1975
SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CA
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A one-dimensional parameter study which identifies the dependence of teleseismic magnitude on near source material properties was carried out. The major results of the material parameter sensitivity study may be summarized as follows 1 increasing the air-filled porosity greatly reduces seismic coupling 2 if any parameter describing the yield surface is varied such that the material strength is reduced, seismic coupling may be substantially enhanced 3 seismic coupling is relatively insensitive to water content a slight decoupling is observed with increasing water content 4 increasing the overburden pressure substantially reduces seismic coupling. The near field coupling and the equivalent elastic source were computed for the recent underground explosion, Mast, at Pahute Mesa. The next step is to generate synthetic seismograms for this event at recently specified receiver locations. The enhanced computational capabilities for treating realistic earth structures will be exercised in this experiment.