2008 NSHM Figures

Figures corresponding to the 2008 U.S. Geological Survey National Seismic Hazard Maps are available for individual download below, or can be downloaded in their entirety from this zip file (11Mb). These figures are probabilistic ground motion maps for Peak Ground Acceleration (PGA), 1Hz (1.0 second SA), and 5Hz (0.2 second SA). Some additional spectral accelerations (SA) are also included for central and southern California. Most figures correspond to the 2% in 50 year probability of exceedance, but there are a few figures for the 10% in 50 year and the 5% in 50 year probability of exceedance as well. The latter figures are identified in the listing below, or can be identified by examining the file name and looking for a “10pc50” or “5in50” (respectively). All ground motion probabilities are computed for the B/C Boundary (Vs30 = 760 m/s). If similar maps were created for the 2002 update, we have also created ratio maps for easy comparison between the updates.

Click a column header to sort by values in that column. Shift+Click to sort by multiple columns.
Region Name Return Period Spectral Acceleration Download
Conterminous U.S. 5% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Conterminous U.S. 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Conterminous U.S. 2% in 50 Years 1Hz (1.0 Second) [JPG | PS]
Conterminous U.S. 2% in 50 Years Peak Ground Acceleration [JPG | PS]
Conterminous U.S. 10% in 50 Years 3.33Hz (0.3 Seconds) [JPG | PS]
Conterminous U.S. 10% in 50 Years 2Hz (0.5 Seconds) [JPG | PS]
Conterminous U.S. 10% in 50 Years Peak Ground Acceleration [JPG | PS]
Conterminous U.S. 10% in 50 Years 0.5Hz (2.0 Seconds) [JPG | PS]
Conterminous U.S. 5% in 50 Years 1Hz (1.0 Second) [JPG | PS]
Conterminous U.S. 2% in 50 Years 2Hz (0.5 Seconds) [JPG | PS]
Conterminous U.S. 2% in 50 Years 0.5Hz (2.0 Seconds) [JPG | PS]
Conterminous U.S. 10% in 50 Years 10Hz (0.1 Seconds) [JPG | PS]
Conterminous U.S. 10% in 50 Years 1Hz (1.0 Second) [JPG | PS]
Conterminous U.S. 5% in 50 Years 2Hz (0.5 Seconds) [JPG | PS]
Conterminous U.S. 2% in 50 Years 10Hz (0.1 Seconds) [JPG | PS]
Conterminous U.S. 2% in 50 Years 3.33Hz (0.3 Seconds) [JPG | PS]
Western U.S. 2% in 50 Years 2Hz (0.5 Seconds) [JPG | PS]
Western U.S. 10% in 50 Years 2Hz (0.5 Seconds) [JPG | PS]
Western U.S. 10% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Western U.S. 5% in 50 Years 3.33Hz (0.3 Seconds) [JPG | PS]
Western U.S. 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Western U.S. 2% in 50 Years 0.5Hz (2.0 Seconds) [JPG | PS]
Western U.S. 2% in 50 Years 10Hz (0.1 Seconds) [JPG | PS]
California-Nevada 2% in 50 Years 1Hz (1.0 Second) [JPG | PS]
California-Nevada 10% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
California-Nevada 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
California-Nevada 2% in 50 Years Peak Ground Acceleration [JPG | PS]
New Mexico 2% in 50 Years 1Hz (1.0 Second) [JPG | PS]
New Mexico 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Oklahoma 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Oregon/Washington 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Washington 2% in 50 Years Peak Ground Acceleration [JPG | PS]
Washington 10% in 50 Years Peak Ground Acceleration [JPG | PS]
Oregon/Washington 2% in 50 Years 0.5Hz (2.0 Seconds) [JPG | PS]
Oregon/Washington 2% in 50 Years 1Hz (1.0 Second) [JPG | PS]
Oregon/Washington 2% in 50 Years 3.33Hz (0.3 Seconds) [JPG | PS]
Portland, OR Not Applicable Unknown [JPG | PS]
Utah 2% in 50 Years Peak Ground Acceleration [JPG | PS]
Utah 10% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Utah 2% in 50 Years 1Hz (1.0 Second) [JPG | PS]
Utah 2% in 50 Years 0.5Hz (2.0 Seconds) [JPG | PS]
Utah 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Central/Eastern U.S. 2% in 50 Years 1Hz (1.0 Second) [JPG | PS]
Central/Eastern U.S. 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Central/Eastern U.S. 10% in 50 Years 1Hz (1.0 Second) [JPG | PS]
Central/Eastern U.S. 10% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
Central/Eastern U.S. 10% in 50 Years Peak Ground Acceleration [JPG | PS]
Central/Eastern U.S. 2% in 50 Years Peak Ground Acceleration [JPG | PS]
New Madrid Seismic Zone 2% in 50 Years 1Hz (1.0 Second) [JPG | PS]
New Madrid Seismic Zone 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
New Madrid Seismic Zone 2% in 50 Years Unknown [JPG | PS]
South Carolina 2% in 50 Years 5Hz (0.2 Seconds) [JPG | PS]
South Carolina 2% in 50 Years Peak Ground Acceleration [JPG | PS]