Coseismic and initial postseismic deformation from the 2004 Parkfield, California, earthquake, observed by global positioning system, electronic distance meter, creepmeters, and borehole strainmeters

Global Positioning System (gps), electronic distance meter, creepmeter, and strainmeter measurements spanning the M 6.0 Parkfield, California, earthquake are examined. Using these data from 100 sec through 9 months following the mainshock, the Omori’s law, with rate inversely related to time, 1/ t p and p ranging between 0.7 and 1.3, characterizes the time-dependent deformation during the postseismic period; these results are consistent with creep models for elastic solids. With an accurate function of postseismic response, the coseismic displacements can be estimated from the high-rate, 1-min sampling gps; and the coseismic displacements are approximately 75% of those estimated from the daily solutions. Consequently, fault-slip models using daily solutions overestimate coseismic slip. In addition, at 2 months and at 8 months following the mainshock, postseismic displacements are modeled as slip on the San Andreas fault with a lower bound on the moment exceeding that of the coseismic moment. Online material: Data description and supplementary figures, tables, and data used in models and time-series analysis.

[1]  Yehuda Bock,et al.  Southern California permanent GPS geodetic array: Spatial filtering of daily positions for estimating coseismic and postseismic displacements induced by the 1992 Landers earthquake , 1997 .

[2]  P. Liu,et al.  Kinematic Inversion of the 2004 M 6.0 Parkfield Earthquake Including an Approximation to Site Effects , 2006 .

[3]  K. Hudnut,et al.  Preliminary Report on the 22 December 2003, M 6.5 San Simeon, California Earthquake , 2004 .

[4]  Paul Segall,et al.  Testing time-predictable earthquake recurrence by direct measurement of strain accumulation and release , 2002, Nature.

[5]  J. Langbein,et al.  Variations in fault slip and strain accumulation at Parkfield, California: Initial results using two‐color geodimeter measurements, 1984–1988 , 1990 .

[6]  J. Langbein,et al.  Sensitivity of crustal deformation instruments to changes in secular rate , 1993 .

[7]  W. Prescott,et al.  Inversion of GPS data for spatially variable slip‐rate on the San Andreas Fault near Parkfield, CA , 2001 .

[8]  M. Wyss,et al.  Seismic and aseismic slip on the San Andreas Fault , 1969 .

[9]  Y. Okada.  Surface deformation due to shear and tensile faults in a half-space , 1985 .

[10]  J. Langbein,et al.  Slip on the San Andreas Fault at Parkfield, California, over Two Earthquake Cycles, and the Implications for Seismic Hazard , 2006 .

[11]  John Langbein,et al.  The earthquake prediction experiment at Parkfield, California , 1994 .

[12]  L. Montési.  Controls of shear zone rheology and tectonic loading on postseismic creep , 2004 .

[13]  Shui-Beih Yu,et al.  Spatial and Temporal Distribution of Slip for the 1999 Chi-Chi, Taiwan, Earthquake , 2004 .

[14]  Paul Bodin,et al.  Using 1-Hz GPS Data to Measure Deformations Caused by the Denali Fault Earthquake , 2003, Science.

[15]  S. Schulz.  Catalog of creepmeter measurements in California from 1966 through 1988 , 1989 .

[16]  Thomas H. Heaton,et al.  The slip history of the 1994 Northridge, California, earthquake determined from strong-motion, teleseismic, GPS, and leveling data , 1996, Bulletin of the Seismological Society of America.

[17]  T. Utsu.  A statistical study on the occurrence of aftershocks. , 1961 .

[18]  Chen Ji,et al.  Slip history of the 2003 San Simeon earthquake constrained by combining 1‐Hz GPS, strong motion, and teleseismic data , 2004 .

[19]  Hugo Perfettini,et al.  Postseismic relaxation driven by brittle creep: A possible mechanism to reconcile geodetic measurements and the decay rate of aftershocks, application to the Chi-Chi earthquake, Taiwan , 2004 .

[20]  Takashi Nakata,et al.  Time‐predictable recurrence model for large earthquakes , 1980 .

[21]  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 .

[22]  Yehuda Bock,et al.  High‐rate real‐time GPS network at Parkfield: Utility for detecting fault slip and seismic displacements , 2004 .

[23]  F. Pollitz,et al.  Mantle Flow Beneath a Continental Strike-Slip Fault: Postseismic Deformation After the 1999 Hector Mine Earthquake , 2001, Science.

[24]  M. Gladwin,et al.  Design parameters for borehole strain instrumentation , 1985 .

[25]  Shu-Hao Chang,et al.  Fault Slip Inverted from Surface Displacements during the 1999 Chi-Chi, Taiwan, Earthquake , 2004 .

[26]  Roger D. Borcherdt,et al.  Recordings of the 2004 Parkfield Earthquake on the General Earthquake Observation System Array: Implications for Earthquake Precursors, Fault Rupture, and Coseismic Strain Changes , 2006 .

[27]  E. Roeloffs.  Creep rate changes at Parkfield, California 1966–1999: Seasonal, precipitation induced, and tectonic , 2001 .

[28]  Chen Ji,et al.  Preliminary Report on the 28 September 2004, M 6.0 Parkfield, California Earthquake , 2005 .

[29]  Kenneth W. Hudnut,et al.  Co-seismic displacements of the 1994 Northridge, California, earthquake , 1996, Bulletin of the Seismological Society of America.

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

[31]  G. R. Huggett,et al.  A multiwavelength distance-measuring instrument for geophysical experiments , 1975 .

[32]  S. Schulz,et al.  Influence of seismicity and rainfall on episodic creep on the San Andreas Fault System in central California , 1983 .

[33]  J. Langbein,et al.  Improved stability of a deeply anchored geodetic monument for deformation monitoring , 1995 .

[34]  J. C. Savage,et al.  Postseismic relaxation and transient creep , 2005 .

[35]  P. Reasenberg,et al.  Earthquake Hazard After a Mainshock in California , 1989, Science.

[36]  William A. Bryant,et al.  Surface Fault Slip Associated with the 2004 Parkfield, California, Earthquake , 2004 .

[37]  Roger D. Borcherdt,et al.  Continuous Borehole Strain and Pore Pressure in the Near Field of the 28 September 2004 M 6.0 Parkfield, California, Earthquake: Implications for Nucleation, Fault Response, Earthquake Prediction, and Tremor , 2006 .

[38]  Chris Marone,et al.  On the mechanics of earthquake afterslip , 1991 .

[39]  R. Bilham.  Coseismic Strain and the Transition to Surface Afterslip Recorded by Creepmeters near the 2004 Parkfield Epicenter , 2005 .

[40]  B. Baker,et al.  Surface Slip Associated with the 2004 Parkfield, California, Earthquake Measured on Alinement Arrays , 2006 .

[41]  Yehuda Bock,et al.  Instantaneous geodetic positioning at medium distances with the Global Positioning System , 2000 .

[42]  J. Zumberge,et al.  Precise point positioning for the efficient and robust analysis of GPS data from large networks , 1997 .

[43]  Harold Jeffieys.  A Modification of Lomnitz's Law of Creep in Rocks , 1958 .

[44]  Paul Segall,et al.  Displacement calculations from geodetic data and the testing of geophysical deformation models , 1988 .

[45]  S. Yoshioka.  Coseismic Slip Distribution of the 1999 Chi-Chi, Taiwan, Earthquake Deduced from Inversion Analysis of GPS Data , 2004 .

[46]  M. Johnston,et al.  Fault failure with moderate earthquakes , 1987 .