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Location of earthquake swarm events near Palmdale, California, using a linear gradient velocity model

Drowley, Dayna Salter and McNally, Karen C. (1980) Location of earthquake swarm events near Palmdale, California, using a linear gradient velocity model. Bulletin of the Seismological Society of America, 70 (6). pp. 2145-2158. ISSN 0037-1106. https://resolver.caltech.edu/CaltechAUTHORS:20140905-112552747

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Abstract

A series of small earthquakes (0.5 ≦ M_L ≦ 3.0) along a 60-km segment of the San Andreas Fault in the vicinity of Palmdale, California, has been recorded since 1976 by an array operated by the California Institute of Technology. The events were analyzed in two steps. First, travel-time data from four regionally well-recorded events (M_L = 2.2, 2.8, 3.0, 2.8) were inverted using a nonlinear least-squares algorithm to obtain a local velocity model consisting of an upper crustal layer with linearly increasing velocity in dipping contact with a constant velocity half-space. Hypocenters of over 150 events were relocated using this velocity model. Most of the events are clustered between the mapped traces of the San Andreas and Punchbowl faults; however, there has been a migration of activity along the San Andreas Fault. Activity which began in a 5-km cluster has expanded during a 2-yr period to fill a 60-km segment of the fault.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://bssa.geoscienceworld.org/content/70/6/2145.abstractPublisherArticle
Additional Information:© 1980, by the Seismological Society of America. Manuscript received January 6, 1980. We would like to thank Dr. L. R. Johnson for his advice and help in the development of the computer program used in this study, and the many useful suggestions he provided throughout the course of the study. We would also like to thank Drs. Hiroo Kanamori and T. V. McEvilly for helpful suggestions, and Mary French for reading the arrival times for all the events used in this study. This research was partially supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Air Force Office of Scientific Research under Contract F49620-79-C-0028 (DSD} and by the U.S. Geological Survey Contracts 14-08-0001-16711 and 14-08-001-17631 (KCM).
Funders:
Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)F49620-79-C-0028
USGS14-08-0001-16711
USGS14-08-001-17631
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences3348
Issue or Number:6
Record Number:CaltechAUTHORS:20140905-112552747
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140905-112552747
Official Citation:Dayna Salter Drowley and Karen C. McNally Location of earthquake swarm events near Palmdale, California, using a linear gradient velocity model Bulletin of the Seismological Society of America, December 1980, v. 70, p. 2145-2158
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49289
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:05 Sep 2014 19:39
Last Modified:03 Oct 2019 07:12

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