HR: 0800h
AN: NG41B-0519    [Abstracts]
TI: Recurrence-time and frequency-slip statistics of slip events on the creeping section of the San Andreas fault
AU: * Abaimov, S G
EM: abaimov@geology.ucdavis.edu
AF: Department of Geology, University of California, Davis, CA 95616, United States
AU: Turcotte, D L
EM: turcotte@geology.ucdavis.edu
AF: Department of Geology, University of California, Davis, CA 95616, United States
AU: Rundle, J B
EM: jbrundle@ucdavis.edu
AF: Department of Geology, University of California, Davis, CA 95616, United States
AU: Rundle, J B
EM: jbrundle@ucdavis.edu
AF: Center for Computational Science and Engineering, University of California, Davis, CA 95616, United States
AB: The frequency-size statistics and recurrence time interval statistics at a point on a fault are important questions in seismic hazard assessments. Does a point on a fault obey the same statistics as earthquakes in a region do? This is a difficult question to answer because the number of repetitive earthquakes on a particular fault that have been observed is small. In order to overcome this difficulty we consider slip events on the creeping section of the San Andreas fault in central California. Sequencies of up to 100 events are obtained from creepmeter records. We compare the statistical distribution of recurrence times with the Brownian passage-time, lognormal, and Weibull distributions and using goodness-of-fit tests find that the Weibull is the preferred distribution. We also consider the frequency-amplitude distribution of slip events. We find that the data clearly do not obey a Gutenberg- Richter distribution. Instead there is a uniform distribution of event sizes for a large fraction of the events.
DE: 4475 Scaling: spatial and temporal (1872, 3270, 4277)
DE: 7209 Earthquake dynamics (1242)
DE: 7223 Earthquake interaction, forecasting, and prediction (1217, 1242)
SC: Nonlinear Geophysics [NG]
MN: 2007 Fall Meeting