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Open-File Report 2013–1293

Geodesy- and Geology-Based Slip-Rate Models for the Western United States (Excluding California) National Seismic Hazard Maps

By Mark D. Petersen, Yuehua Zeng, Kathleen M. Haller, Robert McCaffrey, William C. Hammond, Peter Bird, Morgan Moschetti, Zhengkang Shen, Jayne Bormann, and Wayne Thatcher

Thumbnail of and link to report PDF (18 MB)Abstract

The 2014 National Seismic Hazard Maps for the conterminous United States incorporate additional uncertainty in fault slip-rate parameter that controls the earthquake-activity rates than was applied in previous versions of the hazard maps. This additional uncertainty is accounted for by new geodesy- and geology-based slip-rate models for the Western United States. Models that were considered include an updated geologic model based on expert opinion and four combined inversion models informed by both geologic and geodetic input. The two block models considered indicate significantly higher slip rates than the expert opinion and the two fault-based combined inversion models. For the hazard maps, we apply 20 percent weight with equal weighting for the two fault-based models. Off-fault geodetic-based models were not considered in this version of the maps. Resulting changes to the hazard maps are generally less than 0.05 g (acceleration of gravity). Future research will improve the maps and interpret differences between the new models.

First posted May 1, 2014

For additional information contact:
Director, Geologic Hazards Science Center
U.S. Geological Survey
Box 25046, MS-966
Denver, CO 80225-0046
http://geohazards.cr.usgs.gov/

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Suggested citation:

Petersen, M.D., Zeng, Yuehua, Haller, K.M., McCaffrey, Robert, Hammond, W.C., Bird, Peter, Moschetti, Morgan, Shen, Zhengkang, Bormann, Jayne, and Thatcher, Wayne, 2014, Geodesy- and geology-based slip-rate models for the Western United States (excluding California) national seismic hazard maps: U.S. Geological Survey Open-File Report 2013–1293, 80 p., http://dx.doi.org/10.3133/ofr20131293.

ISSN 2331-1258 (online)



Contents

Introduction

Geologic and Geodetic Data for Slip-Rate Estimation

Seismic-Hazard Results

Conclusions

References Cited

Appendixes


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