Migrating tremors illuminate complex deformation beneath the seismogenic San Andreas fault

David R. Shelly ()
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David R. Shelly: US Geological Survey, 345 Middlefield Road, MS 977, Menlo Park, California 94025, USA

Nature, 2010, vol. 463, issue 7281, 648-652

Abstract: San Andreas tremors Despite extensive studies, there is still much to be discovered about the deformation process below the seismogenic zone of the San Andreas fault. David Shelly of the US Geological Survey now reports an analysis of seismic tremor observed from mid-2001 to 2008 using a technique that provides greater spatial and temporal resolution than has previously been possible in this area. The analysis reveals the San Andreas fault near Parkfield as a continuous structure at the base of the crust, and it unveils previously unknown and complex patterns of deformation on the portion of the fault below the seismogenic zone, including tremor sequences that migrate at rates of up to 80 kilometres per hour.

Date: 2010
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DOI: 10.1038/nature08755

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