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Seismic Event Location in Regional Distances
Final rept. 22 Jul 1988-14 Jan 1991
STATE UNIV OF NEW YORK AT ALBANY RESEARCH FOUNDATION
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Three-component data from regional seismic events recorded by the former NRDC-Soviet Academy of Sciences regional seismic network in Kazakhstan, USSR, have been analyzed with the primary goal of improving regional seismic event location capability. Data from these events were used in the investigation of the following problems related to regional event location 1 determination of wave arrival azimuth 2 observability and value of secondary phase arrivals 3 evaluation and improvement of regional event location algorithms 4 independent determination of master event locations. Starting with very little prior information, we have demonstrated the potential for a sparse seismic network of three 3-component stations to locate events over a wide region with reasonable accuracy and precision, both for epicenter and depth. Our basic findings are that arrival azimuth can be determined with reasonable precision, but the data provide little in the way of location constraint in most cases secondary phase arrivals are routinely observable over a wide distance range, and they provide important location constraints existing location algorithms perform well and provide appropriate estimates of location uncertainty, but must be modified for far-regional applications. Numerous master events have been identified and used to improve our location capability.
APPROVED FOR PUBLIC RELEASE