Investigations of Near-Source Structural Effects on Body Waves. Part I. Yucca Flats; Receiver Functions Appropriate to NTS; MOTIVE Functional Specifications

摘要

This annual technical report includes a detailed report on near-source structural effects on the propagation of body waves at Yucca Flats, NTS. This study was an attempt to utilize Kirchhoff integral techniques to model the structural interactions at Yucca Flats and to thus examine the question of whether the observed magnitude residuals can be completely explained by interactions with structure. The analysis determined that the general trend and the maximum amplitudes of the observed magnitude residuals can indeed be produced by the assumed structure. Variances with the observed magnitude residual patterns do exist in the detailed aspects, however. These variances may result from either inadequacies of the structural model or limitations of the Kirchhoff approximation. Insufficient information is currently on hand to distinguish between those possibilities. In addition, this report contains summaries of NTS receiver function determinations and progress on development of the MOTIVE moment tensor analysis package. Details on both of those studies are contained in separate, previously submitted VSC technical reports. (Author)