Slow slip events in the roots of the San Andreas fault

Science Advances
Baptiste RoussetMichel Campillo

Abstract

Episodic tremor and accompanying slow slip are observed at the down-dip edge of subduction seismogenic zones. While tremors are the seismic signature of this phenomenon, they correspond to a small fraction of the moment released; thus, the associated fault slip can be quantified only by geodetic observations. On continental strike-slip faults, tremors have been observed in the roots of the Parkfield segment of the San Andreas fault. However, associated transient aseismic slip has never been detected. By making use of the timing of transient tremor activity and the dense Parkfield-area global positioning system network, we can detect deep slow slip events (SSEs) at 16-km depth on the Parkfield segment with an average moment equivalent to Mw 4.90 ± 0.08. Characterization of transient SSEs below the Parkfield locked asperity, at the transition with the creeping section of the San Andreas fault, provides new constraints on the seismic cycle in this region.

References

Mar 16, 2007·Nature·David R ShellySatoshi Ide
May 4, 2007·Nature·Satoshi IdeTakahiko Uchide

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Citations

Aug 28, 2020·Science Advances·Yen Joe Tan, David Marsan
Jul 28, 2020·Geophysical Research Letters·Bertrand Rouet-LeducPaul A Johnson
Sep 13, 2020·Science Advances·Lifeng Wang, Sylvain Barbot
Feb 2, 2021·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Whitney M Behr, Roland Bürgmann

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