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:
* Immediate notification of earthquakes to government and emergency managers.
* Earthquake Notification Service (ENS): 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.
* ShakeCast: automated delivery of ShakeMaps customized for critical infrastructure, providing an estimate of shaking experienced.
* Prompt Assessment of Global Earthquakes for Response (PAGER): combines ShakeMap results with an inventory of buildings and construction types to provide an immediate estimate of
* Did-You-Feel-It? (DYFI): crowd-sourced reports of shaking that augment and interpolate instrumental data.
* The ANSS Comprehensive Catalog (ComCat) 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.
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:
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*
Alaska Earthquake Center of the Geophysical Institute, University of Alaska Fairbanks.
*
California Integrated Seismic Network
California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
(CISN), the principal units of which are networks and data centers operated by the California Institute of Technology (Caltech), the Universit