Accession Number : ADP204484

Title :   Asian Upper Mantle P-Wave Velocity Structure from the Analysis of Broadband Waveforms,

Corporate Author : CALIFORNIA UNIV SANTA CRUZ

Personal Author(s) : Rodgers, Arthur ; Schwartz, Susan

PDF Url : ADP204484

Report Date : 14 AUG 1995

Pagination or Media Count : 7

Abstract : Upper mantle P-wave velocity structure beneath Asia was inferred by modelling high-quality broadband P and PP seismograms at distances 10 deg to 55 deg. Data were obtained from IRIS-GSN, CDSN and IRIS-PASSCAL instruments. We regionalized the Asian continent by fitting long-period filtered data to reflectivity synthetics computed for one-dimensional velocity models. Results show that major tectonic provinces can be characterized by single average regional velocity models. These average regional models reveal significant differences in crustal thickness, mantle lid, and low velocity zone properties, and thus will affect seismic discriminants. The data were then filtered less severely to model details of the broadband data and reveal lateral heterogeneity within a tectonic province. Structure of the Tibetan Plateau was studied in detail using regional data recorded at CDSN and GSN stations. Future work will include more broadband P- as well as S-wave modelling.

Descriptors :   *SEISMIC DETECTION, *SEISMIC WAVES, *ARMS CONTROL, *NUCLEAR EXPLOSION DETECTION, *SEISMIC DISCRIMINATION, *EARTH MANTLE, SYMPOSIA, VERIFICATION, MONITORING, UNDERGROUND EXPLOSIONS, NUCLEAR EXPLOSION TESTING, SEISMIC DATA, SEISMIC REFLECTION, BROADBAND, EARTH CRUST, TREATIES, SEISMIC VELOCITY, ASIA, PRIMARY WAVES(SEISMIC WAVES), TECTONICS, SECONDARY WAVES.

Subject Categories : Government and Political Science
      Seismology
      Seismic Detection and Detectors
      Nuclear Weapons
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE