Accession Number : ADA305417

Title :   Design, Evaluation and Construction of TEXESS and LUXESS and Research in Mini-Array Technology and Use of Data from Single Stations and Sparse Networks. Phase 4.

Corporate Author : SOUTHERN METHODIST UNIV DALLAS TX

Personal Author(s) : Herrin, Eugene ; Golden, Paul ; Robertson, Herbert

PDF Url : ADA305417

Report Date : APR 1995

Pagination or Media Count : 54

Abstract : Objectives are : (1) conduct research in seismic mini-array technology and single stations and sparse networks data, (CLIN 1) and (2) design, evaluate, and construct TEXESS, in Southwest Texas, and LUXESS, northeast of Luxor, Egypt, (CLIN 2), along the lines of a GSE Alpha Station. TEXESS was installed by SMU personnel in August 1993, and the first event was a local recorded on 31 August. With deinstallation on hold awaiting diplomatic agreements, work has been directed to CLIN 1 research. Research on time domain processing of array data has resulted in a significant decrease in the standard deviation of azimuths as compared with f-k processing. For example, a reduction of azimuthal standard deviations from +/- 15 degrees with f-k processing to +/-1.4 degrees with time domain processing. The Ms:mb method is an effective and transportable discriminant for shallow events at teleseimic distances with mb greater than 4.75. SMU has been successful in reducing the detection threshold for fundamental mode Rayleigh waves using signals at regional distances for body wave magnitudes as low as 3. Autoregressive (AR) modeling on Lg data has resulted in the ability to discriminate small economic explosions from small earthquakes.

Descriptors :   *EXPLOSIONS, *SEISMIC DISCRIMINATION, STATIONS, EGYPT, NETWORKS, THRESHOLD EFFECTS, EARTHQUAKES, AZIMUTH, TIME DOMAIN, STANDARD DEVIATION, TEXAS, DISCRIMINATE ANALYSIS, RAYLEIGH WAVES, SEISMIC ARRAYS, SHALLOW DEPTH.

Subject Categories : Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE