Accession Number : ADA328164

Title :   Development of Discrimination, Detection, and Location Capabilities in Central and Southern Asia Using Middle-Period Surface Waves Recorded by a Regional Array.

Descriptive Note : Final rept. 15 Jun 95-14 Jun 97,

Corporate Author : COLORADO UNIV AT BOULDER DEPT OF PHYSICS

Personal Author(s) : Levshin, Anatoli L. ; Ritzwoller, Michael H.

PDF Url : ADA328164

Report Date : 10 JUN 1997

Pagination or Media Count : 57

Abstract : This report presents the results of a study of the dispersion characteristics of intermediate period broadband fundamental surface waves propagating across Central Asia, Western China, and parts of the Middle East. We present group velocity maps from 10 s to 40 s period for both Rayleigh and Love waves. Broadband waveform data from about 600 events from 1988 - 1995 recorded at 83 individual stations from several global and regional networks (MEDNET, KNET, KAZNET) have produced about 9,000 paths for which individual dispersion curves have been estimated. These data break into two sets of measurements: those from about 400 large (Ms > 5.0) earthquakes from around the continent recorded on both global and regional networks and those from about 200 additional smaller (Ms < 5.0) events recorded regionally at KNET and KAZNET. The combination of measurements on these two spatial scales helps to optimize path coverage and azimuthal distribution which together determine resolution. This study displays denser and more uniform data coverage and demonstrates higher resolution (-4 deg) than previous studies that have been performed on this scale and at these periods.

Descriptors :   *SURFACE WAVES, *GROUP VELOCITY, *SEISMIC ARRAYS, SEISMIC DETECTION, HIGH RESOLUTION, SEISMIC DATA, EARTH SURFACE, SEISMIC DISCRIMINATION, EARTHQUAKES, SEISMIC SIGNATURES, WAVE PACKETS, RAYLEIGH WAVES, LOVE WAVES, LITHOSPHERE.

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE