Link to USGS home page.
Scientific Investigations Map 2883
  About USGS /  Science Topics /  Maps, Products & Publications /  Education / FAQ

Seismic-Hazard Maps for the Conterminous United States

By Arthur D. Frankel, Mark D. Petersen, Charles S. Mueller, Kathleen M. Haller, Russell L. Wheeler, E.V. Leyendecker, Robert L. Wesson, Stephen C. Harmsen, Chris H. Cramer, David M. Perkins, and Kenneth S. Rukstales

thumbnail image of map

Probabilistic seismic-hazard maps were prepared for the conterminous United States portraying peak horizontal acceleration and horizontal spectral response acceleration for 0.2- and 1.0-second periods with probabilities of exceedance of 10 percent in 50 years and 2 percent in 50 years. All of the maps were prepared by combining the hazard derived from spatially smoothed historic seismicity with the hazard from fault-specific sources. The acceleration values contoured are the random horizontal component. The reference site condition is firm rock, defined as having an average shear-wave velocity of 760 m/sec in the top 30 meters corresponding to the boundary between NEHRP (National Earthquake Hazards Reduction program) site classes B and C.

This data set represents the results of calculations of hazard curves for a grid of points with a spacing of 0.05 degrees in latitude and longitude. The points were contoured to produce the final representation of the seismic hazard.

Version 1.0

Posted May 2005

Part or all of this report is presented in Portable Document Format. The latest version of Adobe Acrobat Reader or similar software is required to view it. If you wish to download the latest version of Acrobat Reader free of charge, click here.

For viewing and printing.
For viewing and printing.
For viewing and printing.
For viewing and printing.
For viewing and printing.
For viewing and printing.
(This version of the report is accessible as defined in Section 508.)
Metadata files for each sheet available for viewing or download.
ARC/INFO dataset for each sheet available for download in two optional formats of compression. logo