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Published 1996 | Published
Technical Report Open

Data Report for the 1993 Los Angeles Region Seismic Experiment (LARSE93), Southern California: a passive study from Seal Beach northeastward through the Mojave Desert


This report contains a description of the first part of the Los Angeles Region Seismic Experiment (LARSE). To date, LARSE has consisted of two experiments: passive, which took place in fall, 1993 (LARSE93), and active, which took place in fall, 1994 (LARSE94). The goal of the 1993 experiment was to collect waveform data from local and distant earthquakes to obtain three-dimensional images of lower crust and upper mantle structure in Southern California, particularly under the San Gabriel Mountains and across the San Andreas fault. During LARSE93, approximately 88 stations were deployed in a 175-km-long, linear array across the Los Angeles basin, San Gabriel Mountains, and Mojave Desert northeast of Los Angeles by scientists from the U.S. Geological Survey, University of California at Los Angeles, California Institute of Technology, and University of Southern California. Reftek recorders were deployed one km apart through the San Gabriel Mountains, and two km apart in the Mojave Desert. This data set has since been complemented by the results of LARSE94 comprising land refraction and deep-crustal seismic reflection profiles from offshore airgun and onshore explosion sources. These additional data sets will be useful in distinguishing crustal structures from adjacent upper mantle structures. During the four weeks of continuous recording, over 150 teleseismic and over 450 local (M_L ≥ 2.0) events were recorded at each site. Both teleseismic and local sources provided a wide range of raypath azimuths. The teleseismic events include a number of earthquakes with epicenters in the Aleutian Island, Kamchatka, Kuril Island, mid-Atlantic Ridge, Solomon Island, Japan, Fiji Island, Peru, and Chile regions. The local events include aftershocks of recent Southern California earthquakes. The final products of data processing are 1) half-hour files containing the continuous wavefonn data recorded at each station for each day of the experiment, 2) 150-second time-windowed waveform segments containing local, regional, and teleseismic event arrivals, and 3) one-hour time-windowed waveform segments containing regional and teleseismic event arrivals. Array instrumentation, recorded events, and data processing will be described in this report.

Additional Information

USGS-OFR-96-85. We wish to thank the dozens of scientists without whose help this experiment would have been nearly impossible. Our thanks go to Marcos Alvarez, Joyjeet Bhowmik, Armando Burciaga, Bob Busby, Cheryl Contopoulos, Ed Criley, H. Ekstrom, Jim Fowler, Doug Given, Katrin Hafner, Thomas Henyey, Craig Jones, Brian Laird, Aaron Martin, Steve Michnik, Janice Murphy, Julie Norris, Guang-yu Pei, Robert Phinney, Michelle Robertson, Craig Scrivner, and John Van Schaak. Many of these scientists, students, and volunteers spent their time in the field deploying and monitoring the array instruments, providing us with instruments and equipment, and providing follow-up maintenance. We thank Tim Ahem, Rick Braman, and the staff of the IRIS DMC for assistance and use of the DMC facilities. This work was supported by the Southern California Earthquake Center and the National Science Foundation.

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Published - kohler_ofr_96_85.pdf


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August 22, 2023
March 12, 2024