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Los Angeles Region Seismic Experiment (LARSE), California, Off-shore Seismic Refraction Data

Uri S. ten Brink, R M. Drury, Gregory Miller, Thomas M. Brocher, & David A. Okaya

Published 1996, SCEC Contribution #347

Nine Ocean Bottom Seismometers (OBSs) were deployed in the Inner California Borderland as part of the Los Angeles Region Seismic Experiment (LARSE). The data recorded by these OBSs were intended to delineate the offshore continuation of crustal structure under the Los Angeles Basin. The experiment, conducted in October 1994, was a cooperative study involving scientists from the U.S. Geological Survey, Caltech, the University of Southern California, the University of California Los Angeles, and the Southern California Earthquake Center (SCEC). The offshore wide-angle seismic experiment was the first such experiment in the area since 1958. The data quality recorded on the OBSs was very good with high signal-to-noise ratio on PmP arrivals in the majority of the OBSs. The total OBS data recovery rate for both deployments was about 80%. This report details the experimental design, the data format, the processing steps and other information pertinent to data analysis and modeling. It also presents seismic refraction records of the offshore area recorded by OBS and selected surrounding land stations.

A World-Wide-Web site has been established for the OBS component of the LARSE experiment showing the location of the experiment, samples of the data, and a short version of this report. The site can be found under http://obs.er.usgs.gov.

ten Brink, U. S., Drury, R. M., Miller, G., Brocher, T. M., & Okaya, D. A. (1996). Los Angeles Region Seismic Experiment (LARSE), California, Off-shore Seismic Refraction Data. , USA: U.S. Geological Survey.