ANSS US Stations

Map of free-field seismic stations across the United States (circa 2020) that are operated by national and regional seismic networks of the ANSS. The background shading indicates seismic hazard as defined in the USGS National Seismic Hazard Model. Regions with lighter highlighting have comparatively higher seismic hazard.  Today, ANSS national and regional seismic networks operate over 3,000 seismic stations, including those that power the west coast ShakeAlert® earthquake early warning system.