Accession Number : ADP204481

Title :   Crustal Heterogeneity in the Basin and Range,

Corporate Author : TEXAS UNIV AT AUSTIN INST FOR GEOPHYSICS

Personal Author(s) : Levander, A. ; Larkin, S. P. ; La Flame, L. M. ; Pullammanapallil, S.

PDF Url : ADP204481

Report Date : 14 AUG 1995

Pagination or Media Count : 10

Abstract : We are investigating the fine-scale structure of the Earth's crust in order to understand its influence on high frequency (0.5-30 Hz) regional wave propagation. We have developed geologically based stochastic models of crustal heterogeneity for a number of different tectonic provinces and crustal levels. Here we have focused on examining geologic maps from extended terranes, and seismic data from the northern and southern Basin and Range. We have developed two different deterministic/stochastic velocity models which produce synthetic seismograms showing many of the reflectivity patterns and crustal events (Pg, PmP, Sg, SmS) observed in Basin and Range near-vertical and wide-angle seismic data. We also have developed several ways to measure the lateral heterogeneity scale length from unstacked seismic data, and have tested them on synthetic data with promising results.

Descriptors :   *SEISMIC DETECTION, *EARTH CRUST, *SEISMIC WAVES, *ARMS CONTROL, *NUCLEAR EXPLOSION DETECTION, SYMPOSIA, STOCHASTIC PROCESSES, VERIFICATION, MONITORING, UNDERGROUND EXPLOSIONS, NUCLEAR EXPLOSION TESTING, SEISMIC REFLECTION, WAVE PROPAGATION, HETEROGENEITY, SEISMIC DISCRIMINATION, TREATIES, SEISMIC VELOCITY, DETERMINANTS(MATHEMATICS), BASINS(GEOGRAPHIC), TECTONICS.

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE