Affiliation:
1. Berkeley Seismological Laboratory, 211 McCone Hall, University of California, Berkeley, CA 94720–4760, USA.
Abstract
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.
Publisher
American Association for the Advancement of Science (AAAS)
Reference6 articles.
1. U.S. Geol. Surv. Prof. Pap. 1515 1990
2. Nonvolcanic Deep Tremor Associated with Subduction in Southwest Japan
3. For ∼3 months after the San Simeon earthquake (located ∼60 km to the west) seismic signals from intense aftershock activity frequently mixed with the lower amplitude tremor signals making accurate analysis of the SAF tremors infeasible.
4. Episodic Tremor and Slip on the Cascadia Subduction Zone: The Chatter of Silent Slip
5. Working Group on California Earthquake Probabilities, Bull. Seismol. Soc. Am.85, 379 (1995).
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