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Yield and discrimination studies in stable continental regions. Final report, 16 Feb 89-9 Jul 91

Technical Report ·
OSTI ID:7029354
This report presents the results of several studies related to research on yield determination and discrimination between earthquakes and explosions. The work proceeded along two lines: (1) the determination of attenuation of Lg coda and intermediate-period surface waves, and (2) discrimination between small earthquakes and explosions in the central United States. The attenuation studies in the first four chapters of this report conclude that (1) the high frequency dependence of Lg coda Q in the Basin and Range can be caused by a rapid increase of Q at mid-crustal depth, (2) patterns of upper crustal Q and upper mantle Q correlate throughout the western United States, (3) Lg coda Q values in the southern USSR, China and southeastern Asia vary between 200 and 700, and (4) attenuation across the Arabian Peninsula is high for a shield region. Discrimination studies indicate (1) that a neural network approach can be effective in determining source depth, and (2) decreases of amplitude with frequency in the central United States are more rapid for earthquakes than for explosions.
Research Organization:
Saint Louis Univ., MO (United States)
OSTI ID:
7029354
Report Number(s):
AD-A-251590/6/XAB; CNN: F19628-89-K-0021
Country of Publication:
United States
Language:
English

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