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Bulletin of the Seismological Society of America; February 1987; v. 77; no. 1; p. 195-211
© 1987 Seismological Society of America
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Multi-channel deconvolution of P waves at seismic arrays

ZOLTAN A. DER, ROBERT H. SHUMWAY and ALISON C. LEES

TELEDYNE-GEOTECH, 314 MONTGOMERY STREET, ALEXANDRIA, VIRGINIA 22314
DIVISION OF STATISTICS UNIVERSITY OF CALIFORNIA, DAVIS, CALIFORNIA 95616

Abstract

The results of a new multi-channel deconvolution method applied to NORSAR and EKA array recordings of teleseismic P waves are presented and interpreted in terms of possible surface reflections and other arrivals from the Nevada Test Site and Kazakh nuclear explosions. The deconvolution method utilizes the well-known fact that P-wave spectra can be decomposed into source and receiver spectral factors. For most events, the source-time functions appear to contain a pP arrival but they also show later, unexplained arrivals. The site functions are also complex in many cases. About half of the late coda in P appears to be due to each source and receiver. The recordings for a presumed Kazakh cratering event show a distinctly different source function when compared to deeper, buried explosions at the same test site. From the deconvolved source-time functions, the cratering to noncratering mb bias is estimated to be between 0.09 and 0.22 magnitude units.




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