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A survey of microearthquake activity along the San Andreas fault from Carrizo Plains to Lake Hughes

Carlson, R. and Kanamori, H. and McNally, K. (1979) A survey of microearthquake activity along the San Andreas fault from Carrizo Plains to Lake Hughes. Bulletin of the Seismological Society of America, 69 (1). pp. 177-186. ISSN 0037-1106.

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An array of moveable seismographic trailers was deployed at three sites along the northern section of the “Big Bend” in the San Andreas fault in southern California. The three sites monitored were the Carrizo Plains, Frazier Park, and Lake Hughes areas. Effective observation times at each site ranged from 38 to 69 days. The microearthquake activity rates observed were 0.3 events/day, 3.0 events/day, and 1.9 events/day, respectively, based on the number of located events plus the number of unlocated events with S-P ≦ 3.0 sec. The majority of the activity does not appear to be directly associated with the San Andreas fault. A comparison of the activity rates observed in this study with the results of a survey conducted in the same areas by Brune and Allen (1967), indicates more than an order of magnitude increase in activity rate in the Lake Hughes area and nearly the same levels of activity at the Carrizo Plains and Frazier Park sites.

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Kanamori, H.0000-0001-8219-9428
Additional Information:Copyright © 1979, by the Seismological Society of America. Manuscript received June 9, 1978. This research was supported by U.S. Geological Survey Contracts 14-08-0001-15893 and 14-08-0001-16711. R. Carlson was supported by a Beno Gutenberg Fellowship and a National Science Foundation Graduate Fellowship. We especially thank Carl Johnson for generating the Southern California seismicity map (Figure 2), and D. Tanner, L. Blayney, and F. Lehner for technical support.
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Caltech Beno Gutenberg FellowshipUNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences3105
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ID Code:48396
Deposited By: George Porter
Deposited On:12 Aug 2014 21:52
Last Modified:09 Mar 2020 13:18

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