2014 United States (Lower 48) Seismic Hazard Long-term Model

Science Center Objects

Seismicity catalogs, GIS shapefiles, gridded seismic hazard curve data, gridded ground motion data, and mapped gridded ground motion values are available for the 2014 National Seismic Hazard Model for the Conterminous U.S.

2014 U.S. Seismic Hazard Map

2014 U.S. seismic hazard map showing the earthquake peak ground acceleration (PGA) that has a 2% chance of being exceeded in 50 years. Red indicates the highest hazard, and gray indicates the lowest hazard. (Public domain.)

Probabilistic seismic hazard data and maps of the conterminous U.S. for peak ground acceleration (PGA) and 0.2 and 1.0 second spectral acceleration at probability levels of 2 percent in 50 years (annual probability of 0.000404) and 10 percent in 50 years (annual probability of 0.0021), assuming firm rock soil conditions at 760 m/s, are available. Hazard was calculated on a 0.05 degree by 0.05 degree grid, defined by a bounding box encompassing the conterminous U.S. (-125 to -65 degrees longitude west, 24.6 to 50 degrees latitude north). Development of the 2014 National Seismic Hazard Model for the Conterminous U.S. is documented in the USGS Open-File Report 2014-1091.

This dataset is considered a legacy dataset. The original dataset was uploaded to the USGS website at the time of publication of the seismic hazard model (2014) but was later moved over the the USGS ScienceBase Catalog (2019). The original dataset was assumed to be complete and accurate, but may contain inconsistencies when compared to more recent, actively maintained datasets.

NOTE: In 2018, additional period and site class maps were calculated for the 2014 NSHM. For additional period and site class maps and data, please see https://doi.org/10.5066/P9I6BPX5, documented in USGS Open-File Report 2018-1111.

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