Accession Number : ADA322098

Title :   Regional Discrimination Studies.

Descriptive Note : Scientific rept. no. 1,

Corporate Author : SOUTHERN METHODIST UNIV DALLAS TX

Personal Author(s) : Hayward, Chris ; Herrin, Eugene ; Sorrell, G. G. ; Tibuleac, Ileana

PDF Url : ADA322098

Report Date : APR 1996

Pagination or Media Count : 63

Abstract : Part (1) describes TXAR in detail. The first Alpha-type station proposed by the GSE in 1993 is the Texas Experimental Seismic System (TEXESS), now designated TXAR, located at Lajitas, Texas, and operated by SMU during GSETT-1 and GSETT-2. Part (2) describes the results of the study of 144 events recorded at TXAR. The correlation method used allows the analysis of weak regional to teleseismic events and the identification of successive phases for each event. Corrected phase velocities show Pn first arrivals come to TXAR from as far as 2000 km. Events at greater distances have mantle P waves as first arrivals. Part (3) describes construction of a new Ground Truth Data Base using regional events from a variety of sources. Known sources include mine explosions, normal earthquakes, earthquake swarms, and very shallow earthquakes induced by hydrocarbon production. These induced earthquakes are only 1 to 4 km deep and have been observed with magnitudes ranging from 1.0 to 4.6. We believe all events in the Permian Basin of Texas to the northeast of TXAR are induced and are associated with oil and gas fields Part (4) are the Acknowledgements required by the contract.

Descriptors :   *SEISMIC DISCRIMINATION, SIGNAL PROCESSING, EXPERIMENTAL DATA, COMPARISON, UNDERGROUND EXPLOSIONS, SURFACE TRUTH.

Subject Categories : Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE