Short-Period P Wave Attenuation along Various Paths in North America as Determined from P Wave Spectra of the SALMON Nuclear Explosion
Technical rept. 1 Jul 1975-30 Jun 1976
TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA ANALYSIS CENTER
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Average Q values were determined for ray paths to various LRSM stations from the SALMON nuclear explosion, which was located in a salt dome in Mississippi, by taking ratios of observed P wave spectra to that of the estimated source spectrum. Most average Q values for the SALMON P wavepaths throughout eastern North America are close to 2000 while those with the last half of their path in the western United States are typically around 400-500. These differences in Q seem to be sufficient to explain the .3-.4 magnitude differences in the teleseismic event magnitude observed in the western vs. eastern United States.