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 (V_s³⁰ = 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	10Hz (0.1 Seconds)	[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	3.33Hz (0.3 Seconds)	[JPG \| PS]
Conterminous U.S.	2% in 50 Years	5Hz (0.2 Seconds)	[JPG \| PS]
Conterminous U.S.	10% in 50 Years	10Hz (0.1 Seconds)	[JPG \| PS]
Conterminous U.S.	5% in 50 Years	2Hz (0.5 Seconds)	[JPG \| PS]
Conterminous U.S.	2% in 50 Years	2Hz (0.5 Seconds)	[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.	2% in 50 Years	0.5Hz (2.0 Seconds)	[JPG \| PS]
Conterminous U.S.	10% in 50 Years	Peak Ground Acceleration	[JPG \| PS]
Conterminous U.S.	10% in 50 Years	1Hz (1.0 Second)	[JPG \| PS]
Conterminous U.S.	2% in 50 Years	Peak Ground Acceleration	[JPG \| PS]
Conterminous U.S.	2% in 50 Years	1Hz (1.0 Second)	[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.	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.	5% 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.	2% in 50 Years	10Hz (0.1 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]
California-Nevada	10% in 50 Years	5Hz (0.2 Seconds)	[JPG \| PS]
California-Nevada	2% in 50 Years	1Hz (1.0 Second)	[JPG \| PS]
New Mexico	2% in 50 Years	5Hz (0.2 Seconds)	[JPG \| PS]
New Mexico	2% in 50 Years	1Hz (1.0 Second)	[JPG \| PS]
Oklahoma	2% in 50 Years	5Hz (0.2 Seconds)	[JPG \| PS]
Washington	10% in 50 Years	Peak Ground Acceleration	[JPG \| PS]
Oregon/Washington	2% in 50 Years	1Hz (1.0 Second)	[JPG \| PS]
Portland, OR	Not Applicable	Unknown	[JPG \| PS]
Washington	2% in 50 Years	Peak Ground Acceleration	[JPG \| PS]
Oregon/Washington	2% in 50 Years	5Hz (0.2 Seconds)	[JPG \| PS]
Oregon/Washington	2% in 50 Years	3.33Hz (0.3 Seconds)	[JPG \| PS]
Oregon/Washington	2% in 50 Years	0.5Hz (2.0 Seconds)	[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	Peak Ground Acceleration	[JPG \| PS]
Utah	2% in 50 Years	5Hz (0.2 Seconds)	[JPG \| PS]
Central/Eastern U.S.	2% in 50 Years	Peak Ground Acceleration	[JPG \| PS]
Central/Eastern U.S.	10% in 50 Years	1Hz (1.0 Second)	[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	5Hz (0.2 Seconds)	[JPG \| PS]
Central/Eastern U.S.	10% in 50 Years	Peak Ground Acceleration	[JPG \| PS]
New Madrid Seismic Zone	2% in 50 Years	Unknown	[JPG \| PS]
New Madrid Seismic Zone	2% in 50 Years	5Hz (0.2 Seconds)	[JPG \| PS]
New Madrid Seismic Zone	2% in 50 Years	1Hz (1.0 Second)	[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]