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Originally published in Science Express on 9 December 2004
Science 21 January 2005:
Vol. 307. no. 5708, p. 389
DOI: 10.1126/science.1107142
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Nonvolcanic Tremors Deep Beneath the San Andreas Fault

Robert M. Nadeau* and David Dolenc

We have discovered nonvolcanic tremor activity (i.e., long-duration seismic signals with no clear P or S waves) within a transform plate boundary zone along the San Andreas Fault near Cholame, California, the inferred epicentral region of the 1857 Fort Tejon earthquake (moment magnitude ~7.8). The tremors occur between 20 to 40 kilometers' depth, below the seismogenic zone (the upper ~15 kilometers of Earth's crust where earthquakes occur), and their activity rates may correlate with variations in local earthquake activity.

Berkeley Seismological Laboratory, 211 McCone Hall, University of California, Berkeley, CA 94720–4760, USA.

* To whom correspondence should be addressed. E-mail: nadeau{at}seismo.berkeley.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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