Studies of Explosion Source Functions and Amplitudes Using Available Far-Field Seismic Data: Final Report

摘要

Available seismic data for three US underground nuclear explosions in granite (HARDHAT, SHOAL, and PILEDRIVER) are reviewed to examine if differences in scaling or coupling can be observed in far-field seismic data. Furthermore, far-field P-wave data are examined in order to compare these three US granite shots with underground nuclear tests conducted in the southern Sahara. Analysis of seismic data is performed at a number of arrays and single stations to estimate the low-frequency level of the far-field P-wave from broad-band seismograms derived from ''short-period'' recordings. The empirically derived explosion source functions of McEvilly and Johnson (1987) are used to predict teleseismic P-wave magnitudes based on the frequency-dependent t(*)(f) models of Der and Lees (1985). The predicted magnitudes are several tenths larger than are observed across the WWSSN network. 73 refs., 17 figs., 12 tabs. (ERA citation 14:029343)