New Earthquake Hazard Map

2014

The 2014 U.S. Geological Survey (USGS) National Seismic Hazard Maps display earthquake ground motions for various probability levels across the United States and are applied in seismic provisions of building codes, insurance rate structures, risk assessments, and other public policy. The updated maps represent an assessment of the best available science in earthquake hazards and incorporate new findings on earthquake ground shaking, faults, seismicity, and geodesy. The USGS National Seismic Hazard Mapping Project developed these maps by incorporating information on potential earthquakes and associated ground shaking obtained from interaction in science and engineering workshops involving hundreds of participants, review by several science organizations and State surveys, and advice from expert panels and a Steering Committee. The new probabilistic hazard maps represent an update of the seismic hazard maps; previous versions were developed by Petersen and others (2008) and Frankel and others (2002), using the methodology developed Frankel and others (1996). Algermissen and Perkins (1976) published the first probabilistic seismic hazard map of the United States which was updated in Algermissen and others (1990).
The National Seismic Hazard Maps are derived from seismic hazard curves calculated on a grid of sites across the United States that describe the frequency of exceeding a set of ground motions. Data and maps from the 2014 U.S. Geological Survey National Seismic Hazard Maps are available for download below. Maps for available periods (0.2 s, 1 s, PGA) and specified annual frequencies can be calculated from the hazard curves. The figure depicts probabilistic ground motion (PGA) with a 2 percent probability of exceedance. All ground motions are calculated for 5 percent damped linear elastic oscillators at site conditions corresponding to the B/C Boundary (Vs30 = 760 m/s).

• Map - Conterminous US, PGA, 2% in 50 years (2MB PDF)
• Data
• Source code (available September 2014)
• Catalogs (available later in 2014)
• Faults Database Search
• Fault Source Map (available later in 2014)
• Documentation - Open File Report 2014-1091