Coseismic and Initial Postseismic Deformation from the 2004 Parkfield, California, Earthquake, Observed by Global Positioning System, Electronic Distance Meter, Creepmeters, and Borehole Strainmeters
2006/09/01 by John Langbein · 1 voice · 9 citations
Computer Science · Earth and Planetary Sciences · #Earthquake Detection and Analysis #Seismology and Earthquake Studies #earthquake and tectonic studies
paper · doi:10.1785/0120050823
openalex publication_date 2006/09/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/22
Abstract
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.
Citations
- Slip on the San Andreas Fault at Parkfield, California, over Two Earthquake Cycles, and the Implications for Seismic Hazard
- Frictional Properties on the San Andreas Fault near Parkfield, California, Inferred from Models of Afterslip following the 2004 Earthquake
- Surface Fault Slip Associated with the 2004 Parkfield, California, Earthquake
- Surface deformation due to shear and tensile faults in a half-space
- Surface Slip Associated with the 2004 Parkfield, California, Earthquake Measured on Alinement Arrays
- Coseismic and Postseismic Slip of the 2004 Parkfield Earthquake from Space-Geodetic Data
- Recordings of the 2004 Parkfield Earthquake on the General Earthquake Observation System Array: Implications for Earthquake Precursors, Fault Rupture, and Coseismic Strain Changes
- Kinematic Inversion of the 2004 M 6.0 Parkfield Earthquake Including an Approximation to Site Effects
- 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
Cited by
- Slip on the San Andreas Fault at Parkfield, California, over Two Earthquake Cycles, and the Implications for Seismic Hazard
- Coseismic and Postseismic Slip of the 2004 Parkfield Earthquake from Space-Geodetic Data
- Kinematic Inversion of the 2004 M 6.0 Parkfield Earthquake Including an Approximation to Site Effects
- Seismomagnetic Effects from the Long-Awaited 28 September 2004 M 6.0 Parkfield Earthquake
- Surface Fault Slip Associated with the 2004 Parkfield, California, Earthquake
- Surface Slip Associated with the 2004 Parkfield, California, Earthquake Measured on Alinement Arrays
- San Andreas Fault Geometry in the Parkfield, California, Region
- Reassessment of a Slip Budget along the Parkfield Segment of the San Andreas Fault
- 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
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