Accession Number : ADA337311

Title :   Investigation of Lg Attenuation and Blockage in Models of the Eurasian Crust

Descriptive Note : Final rept 1 Oct 95-30 Sep 97

Corporate Author : CONNECTICUT UNIV STORRS

Personal Author(s) : Cormier, Vernon F. ; Anderson, Thomas S.

PDF Url : ADA337311

Report Date : 04 JAN 1998

Pagination or Media Count : 117

Abstract : The efficiency of Lg propagation is predicted using known three-dimensional variations in large scale crustal structure with Lg modeled as a sum of SmS rays. The complexity of Lg coda is predicted assuming single scattering. Amplitude variations observed at Eurasian arrays agree with the predictions for the effects of known variations in crustal thickness and basin thickness. For shallow sources, scattering by heterogeneity close to the source and receiver control Lg complexity. Experiments with anisotropic distributions of heterogeneity are effective in simulating the coda of regional phases in regions characterized by a dominant trend of deformation.

Descriptors :   *ATTENUATION, *SEISMOLOGY, *EURASIA, SCATTERING, ARRAYS, ANISOTROPY, EARTH CRUST, SEISMIC WAVES, PATTERNS, HETEROGENEITY, BASINS(GEOGRAPHIC).

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE