Accession Number : ADA313487

Title :   High Resolution Intermediate Period (10-40 s) Group Velocity Variations Across Central Asia.

Descriptive Note : Scientific rept. no. 2, 15 Jun 95-15 Jun 96,

Corporate Author : COLORADO UNIV AT BOULDER DEPT OF PHYSICS

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

PDF Url : ADA313487

Report Date : 10 AUG 1996

Pagination or Media Count : 22

Abstract : This research is dedicated to investigating the relevance and use of intermediate period (10 - 40 s) surface wave data in problems of detection, discrimination, and the accurate location of small events using regional array data. It is focused on the analysis of data from events throughout Central and Southern Asia within 27 degrees of the Kyrgyz Telemetered Seismic Network. The main efforts during the 1 year time period covered by this report were directed to data collection and preprocessing, software development, measurements of surface wave characteristics, and constructing group velocity maps. More than 1400 wave paths for Rayleigh waves and 900 paths for Love waves have been used for this purpose. The spatial resolution of obtained maps is 250-400 km, and they exhibit many features related to local tectonic structures, unresolved by previous studies. The inversion of these maps for the 3D shear-velocity structure of the region is in progress. Such models will provide the means to enhance existing detection and location capabilities in Central and Southern Asia.

Descriptors :   *SEISMIC WAVES, *SECONDARY WAVES, SPATIAL DISTRIBUTION, SURFACE WAVES, NETWORKS, ACCURACY, SEISMIC DETECTION, GROUP VELOCITY, SURFACE PROPERTIES, DATA ACQUISITION, MAPS, SEISMOLOGY, RAYLEIGH WAVES, SEISMIC ARRAYS, TECTONICS, LOVE WAVES, TELEMETER SYSTEMS, SOUTH ASIA.

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE