--> Abstract: The Los Angeles Region Seismic Experiement, Phase II (LARSE II): A Survey to Identify Major Faults and Seismic Hazards Beneath a Large Metropolitan Area, by G. Simila, G. Fuis, T. Burdette, E. Criley, J. Murphy, J. Perron, A. Yong, M. Benthien, S. Baher, R. Clayton, P. Davis, N. Godfrey, T. Henvey, M. Kohler, J. McRaney, D. Okaya, G. Keller, C. Prodehl, T. Ryberg, M. Alvarez, I. Asudeh, H. Thybo, and U. Tenbrink; #90911 (2000)

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Abstract: The Los Angeles Region Seismic Experiement, Phase II (LARSE II): A Survey to Identify Major Faults and Seismic Hazards Beneath a Large Metropolitan Area

SIMILA, G.,1 G. FUIS,2 T. BURDETTE,2 E. CRILEY,2 J. MURPHY,2 J. PERRON,2 A. YONG,2 M. BENTHIEN,3 S. BAHER,3 R. CLAYTON,3 P. DAVIS,3 N. GODFREY,3 TOM HENYEY,3 M. KOHLER,3 J. MCRANEY,3 D. OKAYA,3 G. KELLER,4 C. PRODEHL,5 T. RYBERG,6 M. ALVAREZ,7 I. ASUDEH,8 H. THYBO,9 U. TENBRINK,10

1California State University, Northridge, Northridge, CA
2U.S. Geological Survey, Menlo Park, CA
3University of So. Cal, Los Angeles, CA
4Univerity of Texas, El Paso, El Paso, TX
5Karlsruhe Univ., Karlsruhe, Germany
6GeoForschungsZentrum, Potsdam, Germany
7New Mexico Tech, Socorro, NM
8Geological Survey of Canada, Ottawa, Canada
9University of Copenhagen, Copenhagen, Denmark
10U. S. Geological Survey, Woods Hole, MA

A number of institutions, including the U.S. Geological Survey and the Southern California Earthquake Center, collaborated in a seismic-imaging survey known as the Los Angeles Region Seismic Experiment, Phase II (LARSE II). This survey included an active and passive component and was concentrated along a 100km-long corridor extending from Santa Monica Bay northward to the western Mojave Desert, crossing the Santa Monica Mountains, the San Fernando Valley (Northridge epicentral area), the Santa Susana Mountains, and the western Transverse Ranges. In the active component,1400 seismographs were deployed at 100m spacing along the main corridor, with shot points approximately 1000m apart; with additional cross-lines. Chief imaging targets included the Santa Monica, San Gabriel, and San Andreas faults, blind thrust faults (e.g., Northridge fault), and the depths and shapes of the sedimentary basins in the San Fernando Valley and Santa Monica areas. Preliminary analysis indicates good data quality and energy transmission. Small shots (5-20lbs) in the San Fernando Valley were recorded 50-80km away in the Tehachapis.

 

 

 

AAPG Search and Discovery Article #90911©2000 AAPG Pacific Section and Western Region Society of Petroleum Engineers, Long Beach, California