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U.S. Geological Survey Open-File Report 97–690

Revised Long-term Creep Rates on the Hayward Fault, Alameda and Contra Costa Counties, California

By James J. Lienkaemper and Jon S. Galehouse

Thumbnail of and link to report PDF (591 kB)Abstract

Although the Hayward fault is a source of major earthquakes, it also creeps or slips aseismically, and has done so steadily for several decades (certainly since 1921 and probably since 1869). Most of the fault creeps between 3 and 6 mm/yr, except for a 4- to 6-km-long segment near its south end that creeps at about 9 mm/yr. We present results of our recent surveys to recover angles and deflection lines established across the fault in the 1960s and 1970s, but unmonitored since. We have added data from more offset cultural features to the long-term creep rate data set and made substantial improvements to the analytical method used to compute offsets. The revised creep rate values improve our knowledge of spatial and temporal variation along the fault. The more accurate revised data has reduced the estimate of the average creep rate along most of the fault from 5.1 mm/yr to 4.6 mm/yr. Creep rates in the 9 mm/yr section near the south end have remained the same.

Last modified May 24, 2012
First posted July 12, 2011

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Contact Information, Earthquake Science Center, Menlo Park Science Center
U.S. Geological Survey
345 Middlefield Road, MS 977
Menlo Park, California 94025
http://earthquake.usgs.gov/

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Suggested citation:

Lienkaemper, J.J., and Galehouse, J.S., 1997, Revised long-term creep rates on the Hayward Fault, Alameda and Contra Costa Counties, California: U.S. Geological Survey Open-File Report 97–690, 18 p. (Available at https://pubs.usgs.gov/of/1997/0690/.)



Contents

Abstract

Introduction

Analysis of offset cultural features and results

Analysis of alinement arrays and results

Discussion

Acknowledgments

References


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