Accession Number : ADA207458

Title :   Discrimination Studies Using Short-Period P Waves at Upper Mantle Distances.

Descriptive Note : Final rept. Jan 86-Jan 88,

Corporate Author : SIERRA GEOPHYSICS INC KIRKLAND WA

Personal Author(s) : Given, J W ; Ihnen, S M ; Mellman, G R ; Tucker, W C

PDF Url : ADA207458

Report Date : Apr 1988

Pagination or Media Count : 85

Abstract : Explosion seismograms recorded at upper mantle distances in northwest Eurasia are examined for the purpose of characterizing their time domain signature and determining the effectiveness of a Pearce algorithm discrimination scheme at these distances. The amplitude and timing of the major P-wave branches in the distance range of 500 to 4000 km are predictable in terms of some simple published upper mantle velocity models. The signature of the explosion seismograms is then compared to predicted earthquake seismograms, using a double couple at depth model for the earthquake, to estimate the discrimination potential of this data. In most cases, an explosion should be distinguishable from an earthquake at depths greater than 15 km, given several azimuthally well-distributed stations. (FR)

Descriptors :   *EARTHQUAKES, *UNDERGROUND EXPLOSIONS, ALGORITHMS, DEPTH, DISCRIMINATION, EARTH MANTLE, PRIMARY WAVES(SEISMIC WAVES), RANGE(DISTANCE), SEISMIC DATA, SHORT RANGE(TIME), SEISMIC SIGNATURES, TIME DOMAIN, VELOCITY

Subject Categories : Seismology
      Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE