Seismic-event location in regional distances
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, the authors 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. Their 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 their location capability.
- Research Organization:
- State Univ. of New York, Albany, NY (United States). Research Foundation
- OSTI ID:
- 5286063
- Report Number(s):
- AD-A-235577/4/XAB; CNN: F19628-88-K-0037
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NUCLEAR EXPLOSION DETECTION
SEISMIC DETECTION
ACCURACY
ALGORITHMS
AZIMUTH
COORDINATES
DATA ANALYSIS
DISTANCE
EARTH CRUST
EPICENTERS
MATHEMATICAL MODELS
PERFORMANCE
SEISMIC ARRAYS
SEISMIC WAVES
SEISMOLOGY
USSR
ASIA
DETECTION
DEVELOPED COUNTRIES
EUROPE
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
450300* - Military Technology
Weaponry
& National Defense- Nuclear Explosion Detection