Open AccessUse of P coda for determination of yield on nuclear explosions
Author(s) -
Gupta I. N.,
Blandford R. R.,
Wagner R. A.,
Burnetti J. A.,
McElfresh T. W.
Publication year - 1985
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1985.tb06502.x
Subject(s) - coda , amplitude , yield (engineering) , attenuation , geology , seismology , spectral line , mantle (geology) , physics , geophysics , optics , thermodynamics , astronomy
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 m b , 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.