Investigation of Explosion Generated SV Lg Waves in 2-D Heterogeneous Crustal Models by Finite-Difference Method
Abstract
A linear finite-difference (FD) method was used to compare the excitation of far-field P- and SV-waves generated by shallow dilatational sources in a suite of heterogeneous 2-D crustal models. The crustal models tested included simple layered structures, media with random velocity perturbations having Gaussian or self-similar autocorrelation functions, media with rough or gentle topography generated by Markov chains, and laminated media with sinusoidal folds. The numerical experiments were conducted by directing a broadband planar P- or SV-wave with appropriate incidence angle upon testing models. The dilatational strain history at a shallow linear array of grid points was then recorded so that the far-field P-SV(Lg)-waves from shallow dilatational sources could be inferred by use of the principle of reciprocity. The raw FD synthetics were deconvolved so as to represent the response due to explosion sources with a fixed yield. The mean peak amplitude of the synthetics for each model are compared to that for a reference model consisting of a simple layered medium. Keywords: Finite-Difference; Soil; Rock; Topography; Seismology; Heterogeneity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1988
- Accession Number
- ADA213586
Entities
People
- Keith L. Mclaughlin
- Rong-song Jih