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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 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 catalog currently consists of earthquake hypocenters, orgin times, and magnitudes. We hope to add phase and amplitude readings, as well as first-motion mechanisms and moment tensors in the future.


For information on current earthquakes from the ANSS, see

Information from the ANSS catalog:

Information about the ANSS catalog: