Source Time Functions and Spectra for Underground Nuclear Explosions

Abstract

The model of Haskell for explosion source time functions and spectra fails to satisfy data in the short-period band recorded teleseismically from the three Amchitka Island underground nuclear tests: LONG-SHOT, MILROW, and CANNIKIN. A more recent model due to Mueller and Murphy satisfies the data quite well. The difference in the two models is basically in the fall-off at high frequencies. A simple revision of Haskell's model produces waveforms and spectra nearly identical to ones from Mueller and Murphy's model. This revision requires velocity waveforms to have a rise time of extremely short duration at the elastic boundary, a premise validated by actual near-field measurements.Waveforms are derived from the revised Haskell model and the Mueller and Murphy model and illustrated for pressure at the elastic boundary, reduced displacement potential at the elastic boundary, and far-field displacement. Corresponding spectra are derived and illustrated, *

Study of Selected Events in the Baikal Rift Zone in a Seismic Discrimination Context

“…There appears to be a real dif- tempt is made to quantitatively relate these patterns to observed LR amplitudes since we cannot corr ect the predicted amplitudes for source mechanism, but we can qualitatively compare the pattern of rays to M 5 residuals calculated from the magnitude data in Table IV . (The rays which pass close to the North Pole were stopped close to that point due to ray-tracing numerical problems near von Seggern , B., and R. Blandford (1972). Source time functions and spectra for underground nuclear explosions , Geophys.…”

Analysis of Selected Seismic Events from Asia in a Seismic Discrimination Context

“…Another possible explanation is that, because of the low magnitudes of events studied here, a clear von Seggern, D., and R. Blandford, 1972. Source time functions and spectra for underground nuclear explosions, Geophys.…”

Array analysis of regional Pn and Pg wavefields from the Nevada Test Site

“…These include. for example, work by , Haskell (1967), Mueller & Murphy (1971), von Seggern & Blandford (1972), and HeIberger & Hadley (1981. Evernden et al, (1986) find that the Sharpe model approximates observed explosive source spectra from NTS reasonably well.…”