The Effect of Attenuation on the Spectra of P Waves from Nuclear Explosions in North America
TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA ANALYSIS CENTER
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Anelastic attenuation t star was measured along various paths in North America using spectra of P-waves from nuclear explosions PILEDRIVER, KNICKERBOCKER, MAST, GNOME, and SALMON to various LRSM and SDCS stations. The results are consistent with the presence of a sizeable low Q layer under the western United States WUS and the absence of such layer under the tectonically stable eastern part of North America. Typical values of t star at intermediate distances along paths crossing this low-Q layer are around .45. Paths outside WUS have typical t star values around .15.