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) Electronic Supplement 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 Toké, N. A. Articles by Arrowsmith, J R. Search for Related Content GeoRef GeoRef Citation

Reassessment of a Slip Budget along the Parkfield Segment of the San Andreas Fault

¹ Department of Geological Sciences
Arizona State University Box 871404
Tempe, Arizona 85287-1404
Nathan.toke{at}asu.edu
ramon.arrowsmith{at}asu.edu

Historically, the Parkfield segment has represented a transition in fault behavior along the San Andreas fault (SAF). Despite a 33 mm/yr long-term slip rate along the SAF, slip has not been observed on the Cholame segment since the great 1857 Fort Tejón earthquake. During that time, the Parkfield segment has experienced slip from at least six M 6.0 earthquakes, aseismic fault creep, and from minor earthquakes. Data from aseismic slip-rate studies and historical earthquake studies allow us to estimate the total slip released along this portion of the SAF since 1857. Assuming the SAF should slip at the long-term slip rate, a slip deficit of 5 m exists along the Cholame segment since 1857. The slip deficit is approximately equivalent to 1857 offsets measured on the Cholame and the southeast portion of the Parkfield segment. Thus, the slip deficit in southeast Parkfield and Cholame may be as great as the slip accommodated along these segments in 1857. The slip deficit abruptly decreases to the northwest across the Parkfield segment. It is < 2 m near the town of Parkfield and 0 m northwest of Middle Mountain. An M 7 event rupturing all or part of the Cholame segment and the southeastern Parkfield segment (slip decreasing to the northwest) would release the accumulated slip and is plausible. Importantly, this study also shows that the change in the pattern of strain release occurs in the middle of the Parkfield segment, rather than at its ends.

Online material: Tables showing aseismic and coseismic slip estimations and calculations.

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]

				N. A. Toke, J R. Arrowsmith, J. J. Young, and C. J. Crosby Paleoseismic and Postseismic Observations of Surface Slip along the Parkfield Segment of the San Andreas Fault Bulletin of the Seismological Society of America, September 1, 2006; 96(4B): S221 - S238. [Abstract] [Full Text] [PDF]

				D. D. Jackson and Y. Y. Kagan The 2004 Parkfield Earthquake, the 1985 Prediction, and Characteristic Earthquakes: Lessons for the Future Bulletin of the Seismological Society of America, September 1, 2006; 96(4B): S397 - S409. [Abstract] [Full Text] [PDF]