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ANSS Composite Earthquake Catalog

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The ANSS (Advanced National Seismic System) Composite Catalog is a world-wide earthquake catalog that is created by merging the master earthquake catalogs from contributing ANSS institutions and then removing duplicate solutions for the same event. The ANSS Composite Earthquake Catalog grew out of the efforts of the CNSS (Council of the National Seismic System). It was previously called the CNSS Earthquake Catalog.

The ANSS Composite Catalog currently consists of earthquake hypocenters, orgin times, and magnitudes.

Note (4/9/2015): The ANSS Comprehensive Catalog (ComCat), a newer and different ANSS catalog, contains earthquake source parameters (e.g. hypocenters, magnitudes, phase picks and amplitudes) and other products (e.g. moment tensor solutions, macroseismic information, tectonic summaries, maps) produced by contributing seismic networks. This comprehensive collection of seismic information will eventually replace the ANSS Composite Catalog hosted by the Northern California Data Center; however, historic regional seismic network catalogs have not yet been fully loaded into the ANSS Comprehensive Catalog.

For information on current earthquakes from the ANSS, see

Information from the ANSS Composite Catalog:

Information about the ANSS Composite Catalog: