Further Analyses of Regional Seismic Data Recorded From the Soviet PNE Program: Implications With Respect to CTBT Monitoring.
Final rept. Aug 95-Aug 97.
MAXWELL TECHNOLOGIES INC SAN DIEGO CA
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This report summarizes the result of a joint research program which has been carried out by scientists from Maxwell Technologies, Inc. and the Russian Institute for Dynamics of the Geospheres to use regional seismic data recorded from Soviet PNE tests to assess the transportability of regional discriminants. More specifically, the goal of the study has been to use these PNE data to derive improved, quantitative bounds on the ranges of regional seismic signal characteristics which might be expected from underground nuclear tests conducted under the variety of source and propagation path conditions which must be considered in global monitoring of the CTBT. Broadband data recorded at the Borovoye Geophysical Observatory in Central Asia from 29 of these PNE tests in the distance range from about 7 to 9 degrees have now been processed and analyzed in detail. The characteristics of the explosion source coupling inferred from this analysis indicate systematic variations with source yield, depth of burial and medium which are generally consistent with those predicted by the MuellerMurphy source model. Moreover, the LgP spectral ratios determined from these observed Borovoye PNE data generally decline to average values over of 1 or less at frequencies above about 3 Hz and, therefore, typically appear explosion-like at high frequencies over this entire range of source and propagation path conditions.
- Geology, Geochemistry and Mineralogy
- Ammunition and Explosives