Accession Number : ADA305464

Title :   Wave Propagation and Source Parameters in Eurasia.

Descriptive Note : Final technical rept. 15 Apr 93-14 Oct 95,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF GEOSCIENCES

Personal Author(s) : Langston, Charles A. ; Kang, Daejin ; Wang, Mingguang

PDF Url : ADA305464

Report Date : 12 FEB 1996

Pagination or Media Count : 85

Abstract : Regional seismograms from the Soviet JVE explosion were modeled. The explosion part of the source contained considerable RDP overshoot with possible spall contribution. The tectonic release part was composed of stress relaxation and secondary high frequency sources. Pn, Sn, Rayleigh and Love waves were modeled. SsPmp phases were discovered in regional waves and modeled using ray theory and synthetic seismogram computations. SsPmp is an important wave in broadband data for event under the crustal waveguide but also occurs for crustal events under low velocity surface layers. When structure is known, SsPmp can be used as an added constraint on location of regional events. Teleseismic source inversion using broadband SV waves was investigated. It was found that SV/SH inversion can constrain source radiation patterns as well as P/SH inversion although information on receiver structures is very important. Smaller earthquake events become accessible for waveform inversion using SV and SH waveforms. Theory and computational methods were explored for the problems of plane wave propagation in plane layered, general anisotropic media and point sources in heterogeneous media. A teleseismic body wave inversion package was constructed for routine use.

Descriptors :   *UNDERGROUND EXPLOSIONS, *SEISMIC DISCRIMINATION, STRUCTURES, WAVEFORMS, SEISMIC DATA, LOW VELOCITY, WAVE PROPAGATION, LONG RANGE(DISTANCE), ANISOTROPY, BROADBAND, EARTH CRUST, SEISMIC WAVES, HETEROGENEITY, INVERSION, NUMERICAL METHODS AND PROCEDURES, EARTHQUAKES, EARTH MODELS, PLANE WAVES, RADIATION PATTERNS, RAYLEIGH WAVES, TECTONICS, LOVE WAVES, STRESS RELAXATION.

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE