Postseismic Relaxation Along the San Andreas Fault at Parkfield from Continuous Seismological Observations

Seismic velocity changes and nonvolcanic tremor activity in the Parkfield area in California reveal that large earthquakes induce long-term perturbations of crustal properties in the San Andreas fault zone. The 2003 San Simeon and 2004 Parkfield earthquakes both reduced seismic velocities that were measured from correlations of the ambient seismic noise and induced an increased nonvolcanic tremor activity along the San Andreas fault. After the Parkfield earthquake, velocity reduction and nonvolcanic tremor activity remained elevated for more than 3 years and decayed over time, similarly to afterslip derived from GPS (Global Positioning System) measurements. These observations suggest that the seismic velocity changes are related to co-seismic damage in the shallow layers and to deep co-seismic stress change and postseismic stress relaxation within the San Andreas fault zone.

[1]  Michel Campillo,et al.  Traveltime measurements from noise correlation: stability and detection of instrumental time-shifts , 2007 .

[2]  R. Bürgmann,et al.  Evolution of stress in Southern California for the past 200 years from coseismic, postseismic and interseismic stress changes , 2007 .

[3]  S. Day,et al.  Postseismic Fault Healing on the Rupture Zone of the 1999 M 7.1 Hector Mine, California, Earthquake , 2002 .

[4]  J. Vidale,et al.  Non-volcanic tremor driven by large transient shear stresses , 2007, Nature.

[5]  P. Shearer,et al.  Spatial and temporal stress drop variations in small earthquakes near Parkfield, California , 2007 .

[6]  Michel Campillo,et al.  Towards forecasting volcanic eruptions using seismic noise , 2007, 0706.1935.

[7]  Kristine M. Larson,et al.  Frictional Properties on the San Andreas Fault near Parkfield, California, Inferred from Models of Afterslip following the 2004 Earthquake , 2006 .

[8]  F. Webb,et al.  The Ocean's Seismic Hum , 2005, Science.

[9]  Michel Campillo,et al.  High-Resolution Surface-Wave Tomography from Ambient Seismic Noise , 2005, Science.

[10]  Kazushige Obara,et al.  Nonvolcanic Deep Tremor Associated with Subduction in Southwest Japan , 2002, Science.

[11]  Thomas M. Daley,et al.  Preseismic velocity changes observed from active source monitoring at the Parkfield SAFOD drill site , 2008, Nature.

[12]  R. Nadeau,et al.  Nonvolcanic Tremors Deep Beneath the San Andreas Fault , 2005, Science.

[13]  G. Beroza,et al.  Depth constraints on nonlinear strong ground motion from the 2004 Parkfield earthquake , 2005 .

[14]  John E. Vidale,et al.  Damage to the shallow Landers fault from the nearby Hector Mine earthquake , 2003, Nature.

[15]  Michel Campillo,et al.  A study of the seismic noise from its long-range correlation properties , 2006 .

[16]  R. Archuleta,et al.  Dynamic modeling of the 2004 Mw 6.0 Parkfield, California, earthquake , 2008 .

[17]  Christoph Sens-Schönfelder,et al.  Passive image interferometry and seasonal variations of seismic velocities at Merapi Volcano, Indonesia , 2006 .

[18]  Michel Campillo,et al.  Phase and Correlation in `Random' Seismic Fields and the Reconstruction of the Green Function , 2004 .

[19]  Eric J. Fielding,et al.  Coseismic and Postseismic Slip of the 2004 Parkfield Earthquake from Space-Geodetic Data , 2006 .

[20]  Christoph Sens-Schönfelder,et al.  Fault zone monitoring with passive image interferometry , 2007 .

[21]  H. Dragert,et al.  Episodic Tremor and Slip on the Cascadia Subduction Zone: The Chatter of Silent Slip , 2003, Science.

[22]  William L. Ellsworth,et al.  Monitoring velocity variations in the crust using earthquake doublets: An application to the Calaveras Fault, California , 1984 .

[23]  J. F. Luis,et al.  Mirone: A multi-purpose tool for exploring grid data , 2007, Comput. Geosci..

[24]  R. Rosenfeld.  Nature , 2009, Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery.

[25]  Michel Campillo,et al.  3‐D surface wave tomography of the Piton de la Fournaise volcano using seismic noise correlations , 2007 .

[26]  J. Ashby.  References and Notes , 1999 .