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. doi:10.1126/science.201.4358.814. 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 | ||||||||||||
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Additional Information: | © 1978 American Association for the Advancement of Science. Received for publication 8 May 1978. Revision received 10 July 1978. | ||||||||||||
Group: | UNSPECIFIED, Division of Geological and Planetary Sciences | ||||||||||||
Issue or Number: | 4358 | ||||||||||||
DOI: | 10.1126/science.201.4358.814 | ||||||||||||
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: | 10 Nov 2021 22:00 |
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