Use of P coda for determination of yield on nuclear explosions |
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| Authors: | I N Gupta R R Blandford R A Wagner J A Burnetti T W McElfresh |
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| Institution: | Teledyne Geotech, 314 Montgomery Street, Alexandria, Virginia 22314, USA |
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| Abstract: | Summary. Spectral analysis of P and P coda from NTS explosions recorded at NORSAR shows that magnitudes based on spectral integration of P coda provide a significantly more precise measure of yield than those based on the initial P . Coda amplitudes and spectra are considerably less sensitive to near-source variations than the direct P . A plot of P -coda magnitude, after correcting for the effects of attenuation in the upper mantle and the source spectrum based on knowledge of approximate yield or mb , versus log yield appears to have a slope of unity. This implies that P coda from several stations (with different but known t * values) can be combined to improve the yield determinations further. Single station P coda from Soviet explosions can also be used to determine relative yields that appear to be at least as precise as those from Lg based on a network of stations. |
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| Keywords: | NORSAR nuclear explosion P coda Soviet explosion teleseismic P yield |
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