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Open-File Report 2014–1249

Key Recovery Factors for the August 24, 2014, South Napa Earthquake

By Kenneth W. Hudnut, Thomas M. Brocher, Carol S. Prentice, John Boatwright, Benjamin A. Brooks, Brad T. Aagaard, J. Luke Blair, Joe B. Fletcher, Jemile E. Erdem, Charles W. Wicks, Jessica R. Murray, Fred F. Pollitz, John Langbein, Jerry Svarc, David P. Schwartz, Daniel J. Ponti, Suzanne Hecker, Stephen DeLong, Carla Rosa, Brenda Jones, Rynn Lamb, Anne M. Rosinski, Timothy P. McCrink, Timothy E. Dawson, Gordon Seitz, Ron S. Rubin, Craig Glennie, Darren Hauser, Todd Ericksen, Dan Mardock, Don F. Hoirup, and Jonathan D. Bray

Executive Summary

Through discussions between the Federal Emergency Management Agency (FEMA) and the U.S. Geological Survey (USGS) following the South Napa earthquake, it was determined that several key decision points would be faced by FEMA for which additional information should be sought and provided by USGS and its partners. This report addresses the four tasks that were agreed to. These tasks are (1) assessment of ongoing fault movement (called afterslip) especially in the Browns Valley residential neighborhood, (2) assessment of the shaking pattern in the downtown area of the City of Napa, (3) improvement of information on the fault hazards posed by the West Napa Fault System (record of past earthquakes and slip rate, for example), and (4) imagery acquisition and data processing to provide overall geospatial information support to FEMA.

First posted December 4, 2014

For additional information, contact:
Earthquake Science Center—Pasadena, Calif. Field Office
U.S. Geological Survey
525 South Wilson Ave.
Pasadena, CA 91106-3212

Justin Pressfield

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Suggested citation:

Hudnut, K.W., Brocher, T.M., Prentice, C.S., Boatwright, J., Brooks, B.A., Aagaard, B.T., Blair, J.L., Fletcher, J.B., Erdem, J.E., Wicks, C.W., Murray, J.R., Pollitz, F.F., Langbein, J., Svarc, J., Schwartz, D.P., Ponti, D.J., Hecker, S., DeLong, S., Rosa, C., Jones, B., Lamb, R., Rosinski, A., McCrink, T.P., Dawson, T.E., Seitz, G., Rubin, R.S., Glennie, C., Hauser, D., Ericksen, T., Mardock, D., Hoirup, D.F., and Bray, J.D., 2014, Key recovery factors for the August 24, 2014, South Napa earthquake: U.S. Geological Survey Open-File Report 2014–1249, 51 p.,

ISSN 2331-1258 (online)




Analysis of Ground-Motion in the City of Napa

Fault Hazards

Critical Lifeline Infrastructure Impacts


Conclusions and Closing Statements

References Cited

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