Sensitivity of the close-in seismic source function to rock properties. Los Alamos Source Region Program.

摘要

The objective of this investigation is to determine and evaluate how rock properties near the origin of an explosion influence the close-in seismic source function. This is work in progress that represents one step in the systematic investigation of parameters important in the remote identification of underground nuclear tests. In this study, the 'overshoot'' and ''steady state value'' of the reduced displacement potential, and the ''corner frequency'' and ''rolloff'' of the reduced velocity potential spectrum are the properties of the source function used as principal measures of effect. A series of one-dimensional, spherically symmetric calculations are made with the computational mesh divided into six phenomenological regions. Material properties are modified in selected regions to evaluate source function sensitivities.