Research in Seismology

Research related to the detection, location, and identification of underground nuclear explosion devoted to several major problem areas has been completed. Effects of earth structure and focal mechanism on body-wave magnitude determinations have been investigated, and empirical relations between nuc...

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Bibliographic Details
Main Author: Kisslinger, Carl
Format: Report
Language:English
Subjects:
ANOMALIES
DETECTION
EARTHQUAKES
NETWORKS
NUCLEAR EXPLOSIONS
PRIMARY WAVES
RAYLEIGH WAVES
Seismic Detection and Detectors
SEISMOLOGICAL STATIONS
Seismology
STATISTICAL ANALYSIS
STRUCTURAL GEOLOGY
TABLES(DATA)
UNDERGROUND EXPLOSIONS
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Summary:Research related to the detection, location, and identification of underground nuclear explosion devoted to several major problem areas has been completed. Effects of earth structure and focal mechanism on body-wave magnitude determinations have been investigated, and empirical relations between nuclear yield and Rayleigh wave magnitudes established for selected seismograph stations. Calculations of crustal transmission coefficients for P-waves have been extended to take into account dip and the results applied to observations of laboratory explosion and deep earthquakes. A model for the triggering of earthquakes by explosions based on finite-strain theory has been suggested, the superposition of the explosion-generated and triggered-earthquake-generated P- wave computed for single models, and aftershocks of the Benham event analyzed. Methods of using P-wave and Rayleigh wave spectra for determining earthquake mechanisms have been developed and applied. A small local network for detecting and locating low magnitude earthquakes in southeast Missouri has yielded good data on current local seismicity. Sponsored in part by DARPA.