Evaluation of the Performance during the GSE Technical Test.
Technical rept. 1 Jan-30 Jun 86,
SCIENCE APPLICATIONS INTERNATIONAL CORP ARLINGTON VA
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Continuing evaluations of the Centers performance during the GSE Technical Test led to improvements in the automatic association program and verified that the automatic signal detector flagged all expected seismic P-waves. Research on methods for the analysis of seismic data resulted in demonstration of promising methods for identifying pp by polarization filtering and a correlation method. Polarization filtering was applied to two events near the Aral Sea and helped determine that complications in the signals at NORESS were not due to a multiple explosive source. Another investigation of regional events recorded at NORESS revealed spectral differences that could be used to discriminate between earthquakes and explosions in a limited source region. Network capability studies demonstrated agreement between SNAPD estimates and results from a network in the Baykal region, as well as possible effects of source radiation patterns on station detection thresholds. Analysis of explosion generated and synthetic waveforms showed that waveform periods and shapes can be used to constrain estimates of t, and illustrated the strong dependence of t estimates on assumptions about near-source conditions. Author
- Seismic Detection and Detectors