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Earthquake Swarm Along the San Andreas Fault near Palmdale, Southern California, 1976 to 1977

McNally, K. C. and Kanamori, H. and Pechmann, J. C. and Fuis, G. (1978) Earthquake Swarm Along the San Andreas Fault near Palmdale, Southern California, 1976 to 1977. Science, 201 (4358). pp. 814-817. ISSN 0036-8075. https://resolver.caltech.edu/CaltechAUTHORS:20150610-064303125

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Abstract

Between November 1976 and November 1977 a swarm of small earthquakes (local magnitude ≤ 3) occurred on or near the San Andreas fault near Palmdale, California. This swarm was the first observed along this section of the San Andreas since cataloging of instrumental data began in 1932. The activity followed partial subsidence of the 35-centimeter vertical crustal uplift known as the Palmdale bulge along this "locked" section of the San Andreas, which last broke in the great (surface-wave magnitude = 8¼+) 1857 Fort Tejon earthquake. The swarm events exhibit characteristics previously observed for some foreshock sequences, such as tight clustering of hypocenters and time-dependent rotations of stress axes inferred from focal mechanisms. However, because of our present lack of understanding of the processes that precede earthquake faulting, the implications of the swarm for future large earthquakes on the San Andreas fault are unknown.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.201.4358.814DOIArticle
http://www.sciencemag.org/content/201/4358/814.abstractPublisherArticle
http://www.jstor.org/stable/1746140JSTORArticle
ORCID:
AuthorORCID
Kanamori, H.0000-0001-8219-9428
Additional Information:© 1978 American Association for the Advancement of Science. Received for publication 8 May 1978. Revision received 10 July 1978.
Issue or Number:4358
Record Number:CaltechAUTHORS:20150610-064303125
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150610-064303125
Official Citation:Earthquake Swarm Along the San Andreas Fault near Palmdale, Southern California, 1976 to 1977 K. C. MCNALLY, H. KANAMORI, J. C. PECHMANN, and G. FUIS Science 1 September 1978: 201 (4358), 814-817. [DOI:10.1126/science.201.4358.814]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58141
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:10 Jun 2015 15:23
Last Modified:09 Mar 2020 13:18

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