articleScienceSep 12, 2008Closed access

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

Centre National de la Recherche Scientifique · Institut de physique du globe de Paris · +2 more institutions

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Abstract

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…

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