Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Titus, S. J. Articles by Tikoff, B. Search for Related Content GeoRef GeoRef Citation

Thirty-Five-Year Creep Rates for the Creeping Segment of the San Andreas Fault and the Effects of the 2004 Parkfield Earthquake: Constraints from Alignment Arrays, Continuous Global Positioning System, and Creepmeters

¹ Department of Geology and Geophysics
University of Wisconsin
Madison, Wisconsin 53706

We present results from differential Global Positioning System (GPS) surveys of seven alignment arrays and four continuous GPS sites along the creeping segment of the San Andreas fault. Surveys of four alignment arrays from the central creeping segment yield 33- to 36-year average minimum slip rates of 21–26 mm/yr. These rates are consistent with previous alignment array surveys spanning a 10-year period and with rates determined by creepmeters, indicating approximate steady- state creep along the central creeping segment for at least 35 years. Motion between continuous GPS sites that span the central creeping segment is 28.2 ± 0.5 mm/yr for two sites that are 1 km apart and 33.6 ± 1 mm/yr for two sites that are 70 km apart. Slip rates therefore increase with distance from the creeping segment of the San Andreas fault. All rates reported here are significantly slower than the 39 ± 2 mm/yr rate predicted for motion between the Sierra Nevada–Great Valley block and the Pacific plate. Repeat surveys of three alignment arrays following the 2004 Parkfield earthquake demonstrate that its coseismic and short-term postseismic offsets decrease rapidly with distance from the epicenter, from 150 mm to 15 mm to <5 mm at respective distances of 9, 36, and 54 km to the northwest. Continuous GPS data confirm that little coseismic and postseismic slip occurred along the central creeping segment. Geodetic and geologic slip rates are compared and different models for the accommodation of transcurrent deformation across the creeping segment are discussed.

This article has been cited by other articles:

				R. A. Harris and J R. Arrowsmith Introduction to the Special Issue on the 2004 Parkfield Earthquake and the Parkfield Earthquake Prediction Experiment Bulletin of the Seismological Society of America, September 1, 2006; 96(4B): S1 - S10. [Abstract] [Full Text] [PDF]

				I. A. Johanson, E. J. Fielding, F. Rolandone, and R. Burgmann Coseismic and Postseismic Slip of the 2004 Parkfield Earthquake from Space-Geodetic Data Bulletin of the Seismological Society of America, September 1, 2006; 96(4B): S269 - S282. [Abstract] [Full Text] [PDF]

				N. A. Toke and J R. Arrowsmith Reassessment of a Slip Budget along the Parkfield Segment of the San Andreas Fault Bulletin of the Seismological Society of America, September 1, 2006; 96(4B): S339 - S348. [Abstract] [Full Text] [PDF]