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ANSS Regions and Stations

The ANSS (Advanced National Seismic System) is composed of representatives from most of the US regional seismic networks and the National Seismic Network.

The ANSS maintains an authoritative catalog of events based on a merging of catalogs from the ANSS member networks. This plot shows the authoritative regions in the western U.S., along with the locations of seismic stations in each network.