Advanced National Seismic System
The Advanced National Seismic System is a collaboration of the United States Geological Survey and regional, state, and academic partners that collects and analyzes data on significant earthquakes to provide near real-time 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 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, with the results posted at the USGS earthquake web page.
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:- Earthquake detections, location, depths, magnitudes, and origin times.
- Earthquake source information, including focal mechanisms, moment tensors, and .
- ShakeAlert: Earthquake early warning messages in California, Oregon, and Washington.
- Immediate notification of earthquakes to government and emergency managers.': customized notifications via e-mail and text messages.ShakeMap: a map of the anticipated severity and extent of ground shaking, based on the measured strength of ground shaking and known characteristics of the affected locality.
- ': automated delivery of ShakeMaps customized for critical infrastructure, providing an estimate of shaking experienced.': combines ShakeMap results with an inventory of buildings and construction types to provide an immediate estimate of
- ': crowd-sourced reports of shaking that augment and interpolate instrumental data.
- ': estimations of the impacts of landslides and liquefaction caused by earthquake shaking.
- The ANSS ' is a repository of data from the participating seismic networks. For significant earthquakes the NEIC prepares a summary of the tectonic setting, nearby fault systems, and historical seismicity.
Participating regional networks
As of 2023 the following networks were participating in the ANSS:- of the Geophysical Institute, University of Alaska Fairbanks.
- , the principal units of which are networks and data centers operated by the California Institute of Technology, the University of California Berkeley, and the USGS Earthquake Science Center at Menlo Park, which are all participants in ANSS, as well as the California Geological Survey.
- , University of Memphis.
- .
- , University of Nevada, Reno.
- Oklahoma Geological Survey, University of Oklahoma.
- Pacific Northwest Seismic Network, operated by the University of Washington and University of Oregon.
- , University of Puerto Rico, Mayaguez.
- .
- .
- .
- USGS Hawaiian Volcano Observatory.
- USGS National Earthquake Information Center.
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.