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Seismicity near Palmdale, California, and its relation to strain changes

Sauber, Jeanne and McNally, Karen C. and Pechmann, James C. and Kanamori, Hiroo (1983) Seismicity near Palmdale, California, and its relation to strain changes. Journal of Geophysical Research B, 88 (B3). pp. 2213-2219. ISSN 0148-0227.

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We evaluate the relationships between the spatio-temporal patterns and faulting mechanisms of small earthquakes and the recent temporal changes in horizontal strain observed along the ‘big bend’ portion of the San Andreas fault near Palmdale, California. Microearthquake activity along the entire big bend of the San Andreas fault increased in November 1976 concurrent with the initiation of an earthquake swarm at Juniper Hills. This activity then decreased abruptly to the northwest and southeast of Juniper Hills during the beginning of 1979. This drop in seismic activity occurred around the time that crustal dilatation was observed on the U. S. Geological Survey Palmdale trilateration network. Focal mechanisms from the study region are predominantly thrust. There are two time periods when the mechanisms are closer to strike slip than to thrust. The first period (December 1976 to February 1977) corresponds to the beginning of the Juniper Hills swarm. The second period (November 1978 to April 1979) approximately coincides with a change in trend of the strain data from uniaxial N-S compression to dilatation.

Item Type:Article
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Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 1983 American Geophysical Union. Received August 7, 1981; revised August 3, 1982; accepted September 8, 1982. We thank J. C. Savage and P. MacDoran for supplying data in advance of publication; Carol Bryan for her assistance in determining some of the focal mechanisms; Roger Bowman, Bill Stuart, Lynn Sykes, and an anonymous reviewer for their critical reading of the manuscript. This work was supported by U. S. Geological Survey contract 14-08-0001-19266 and by the Earth Sciences section, National Science Foundation grant EAR 78-05352. Contribution 3677, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.
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NSFEAR 78-05352
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Caltech Division of Geological and Planetary Sciences3677
Issue or Number:B3
Record Number:CaltechAUTHORS:20141111-105356751
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Official Citation:Sauber, J., K. McNally, J. C. Pechmann, and H. Kanamori (1983), Seismicity near Palmdale, California, and its relation to strain changes, J. Geophys. Res., 88(B3), 2213–2219, doi:10.1029/JB088iB03p02213.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51572
Deposited By: Jason Perez
Deposited On:11 Nov 2014 19:41
Last Modified:09 Mar 2020 13:18

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