Advanced National Seismic System

The Advanced National Seismic System (ANSS) is a collaboration of the U.S. Geological Survey (USGS) and regional, state, and academic partners that collects and analyzes data on significant earthquakes to provide near real-time (generally within 10 to 30 minutes) information to emergency responders and officials, the news media, and the public. Such information is used to anticipate the likely severity and extent of damage, and to guide decisions on the responses needed.
Data is collected by eleven regional seismic networks and the "National Seismic Network" ("ANSS backbone") of dedicated stations, with additional inputs from overseas seismic networks. Analysis is done at the regional data centers, and at the USGS National Earthquake Information Center (NEIC), with the results posted at the USGS earthquake web page (https://earthquake.usgs.gov/earthquakes/).
The National Strong Motion Project of the ANSS has instrumented 168 structures to record their response to very strong shaking. This data is used in research on earthquake-resistant engineering.
Products and services.
The ANSS provides a range of products and services:
These can be accessed at the USGS Earthquake page: https://earthquake.usgs.gov/earthquakes/.
Participating regional networks.
As of 2016 the following eleven networks were participating in the ANSS:
Additional stations are operated by the USGS Albuquerque Seismological Laboratory (ASL).
The regional networks are deemed authoritative for the location and magnitude of earthquakes in their region. The NEIC receives additional data from about 3,000 stations around the world, and provides backup if a regional network is unable to communicate.