Effects of Local Geologic Structure for Yucca Flats, NTS, Explosion Waveforms: 2-Dimensional Linear Finite Difference Simulations

摘要

Two-dimensional linear elastic finite difference calculations were performed for two-dimensional geologic model of Yucca Flats, Nevada Test Site, Nevada. The calculations were used to produce synthetic teleseismic P-wave seismograms for explosive line sources in Yucca Flats. P-wave coda (first 5 seconds) is observed to be highly dependent on takeoff angle for the teleseismic synthetics. P-wave coda varies with the position of the source in the valley structure and may produce variations in the individual station telesiesmic P-wave m sub b magnitude of up to 0.3 magnitude units. However these magnitude variations should be substantially reduced by averaging over stations at multiple azimuth. (Author)