Tremor-tide correlations and near-lithostatic pore pressure on the deep San Andreas fault

Amanda M. Thomas (), Robert M. Nadeau and Roland Bürgmann
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Amanda M. Thomas: Berkeley Seismological Laboratory, University of California-Berkeley, 307 McCone Hall, Berkeley, California 94720–4767, USA
Robert M. Nadeau: Berkeley Seismological Laboratory, University of California-Berkeley, 307 McCone Hall, Berkeley, California 94720–4767, USA
Roland Bürgmann: Berkeley Seismological Laboratory, University of California-Berkeley, 307 McCone Hall, Berkeley, California 94720–4767, USA

Nature, 2009, vol. 462, issue 7276, 1048-1051

Abstract: Parkfield tremors reach out Amanda Thomas and colleagues identify a correlation between non-volcanic tremor activity near Parkfield, California, and extremely small, tidally induced shear stress parallel to the San Andreas fault. Non-volcanic tremor is a weak seismic signal observed periodically on some major faults. Thomas et al. suggest that the Parkfield tremors may represent shear failure on a critically stressed fault in the presence of near-lithostatic pore pressure. Similarities with tremor in subduction-zone environments, such as Cascadia and Japan, indicate that these findings may also be relevant to other tectonic settings.

Date: 2009
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DOI: 10.1038/nature08654

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