Accession Number : ADA294966

Title :   Seismic Wave Radiation, Propagation and Event Location in Laterally Heterogeneous Media.

Descriptive Note : Final rept. 1 Jul 93-31 Dec 94,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Ben-Menahem, Ari ; Imhof, Matthias G. ; Li, Yingping ; Mikhailov, Oleg ; Rodi, William

PDF Url : ADA294966

Report Date : 01 MAY 1995

Pagination or Media Count : 109

Abstract : Three studies related to nuclear monitoring and discrimination are reported. First, we present a new approach to modeling elastic wave scattering, based on multiple multipole Expansions. Numerical examples demonstrate that the new algorithm is a very general tool for solving relatively large and complex two dimensional scattering. problems. Second, we apply relative event location and waveform cross-correlation techniques to relocate four presumed nuclear explosions at the Balapan, Kazakhstan Test Site. The relative locations obtained from differential P and PoP arrival times at a small number of far-regional and teleseismic stations are more accurate than conventional seismic locations obtained with hundreds of arrival time picks. The third study addresses the effects of non-sphericity of an explosion cavity on seismic wave radiation. A new analytical technique is presented for computing the effects of cavities of arbitrary shape. The technique is applied to study far-field P and S wave radiation from explosions as a function of frequency.

Descriptors :   *NUCLEAR EXPLOSION DETECTION, *SEISMIC DISCRIMINATION, *SEISMOLOGY, ALGORITHMS, NUCLEAR EXPLOSIONS, POSITION(LOCATION), SURFACE WAVES, WAVEFORMS, CAVITIES, MATHEMATICAL ANALYSIS, RAYLEIGH SCATTERING, LONG RANGE(DISTANCE), SEISMIC WAVES, HETEROGENEITY, ELASTIC SCATTERING, EARTH MODELS, CORRELATION TECHNIQUES, TEST FACILITIES, ELASTIC WAVES.

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE