Regional Discrimination Research and Methodology Implementation: Analyses of CDSN and Soviet IRIS Data
S-CUBED LA JOLLA CA
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The objective of this research is to evaluate the capability of regional stations in discrimination of underground nuclear explosions from earthquakes and non-nuclear explosions. Efforts during the first year of this program have focused on studies of regional data from the Chinese Digital Seismic NetworkCDSN and Incorporated Research Institutions for SeismologyIRIS stations in the Soviet Union. A previous report described observations from the CDSN station at WMQ which indicated differences in relative spectral content of Lg versus regional P for explosions and earthquakes. In the current research we used different spectral analyses to study the signals from a larger event sample including 27 East Kazakh explosions and 32 regional earthquakes. LgP ratios for regional earthquakes were found to be enriched at high frequencies compared to similar explosions. In comparing explosions from Shagan River and Degelen Mountain areas it was found that regional P signals are relatively stronger from SR than from DM explosions with similar Lg signals. Analysis of East Kazakh explosion signals recorded at Soviet IRIS stations indicates that regional signals are observable down to very low magnitudes. Lg magnitude residuals from these stations have been used to derive effective Q values for these paths.
- Nuclear Warfare
- Seismic Detection and Detectors