Accession Number : ADA297909

Title :   Characterization of Broadband Regional Distance Seismograms: Use of Global, Open Data to Study Regions of Interest.

Descriptive Note : Final technical rept. 15 Jul 92-15 Jan 95,

Corporate Author : ARIZONA UNIV TUCSON DEPT OF GEOSCIENCES

Personal Author(s) : Wallace, Terry C. ; Beck, Susan L.

PDF Url : ADA297909

Report Date : JUN 1995

Pagination or Media Count : 91

Abstract : This research undertook scientific problem inherent in the monitoring of a comprehensive nuclear test ban treaty; establishing confidence that the seismograms from small and moderate-sized events are understood, thus, identifiable. This requires an understanding of broadband regional distance seismic phases from both explosions and earthquakes, the excitation of the various phases, and their dependence on source. Data from open broadband stations across the Andean Cordillera were used in research to evaluate the utility of the spectral characteristics of regional distance seismo-grams of phase ratio pairs (Pg/Lg; Pn/Lg). The entire regional waveforms for seismic events traversing the Andes were modeled providing detail of crustal thickness, the average crustal velocity, and propagation efficiency. Further, this report details research to treat a single regional distance station as a seismic observatory and to establish a relative location procedure in which to locate smaller magnitude events relative to an established epicentral coordinate. Finally, the results are reported of a temporary broadband deployment used to record the DOE hosted Non-Proliferation Experiment; exploration of how geologic environment changes affects discriminants. (MM)

Descriptors :   *SEISMIC WAVES, *NUCLEAR EXPLOSION DETECTION, *EARTHQUAKES, *GEOPHYSICS, *SEISMOGRAPHS, UNDERGROUND EXPLOSIONS, NUCLEAR EXPLOSION TESTING, SEISMIC DATA, MOUNTAINS, EARTH CRUST, GRAVITY, ARMS CONTROL, SEISMIC DISCRIMINATION, SOUTH AMERICA, TRAVEL TIME, TECTONICS.

Subject Categories : Seismology
      Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE