Composite Earthquake Catalog

ANSS 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

• ANSS Maps of Recent Earthquake Activity

Information from the ANSS catalog:

• Search the catalog
  Use the form to generate your own search of the ANSS catalog.

• Earthquake maps & lists
  Examples of seismicity from the ANSS catalog.

• Copying the ANSS catalog
  The ANSS catalog files are available via anonymous ftp.

Information about the ANSS catalog:

• Details of the catalog creation
  Description of the process of catalog generation.

• Data availability & catalog caveats
  Description of the time period of coverage for contributing networks.

• Source codes for the contributing networks
  Table of source codes that identify the contributing network or agency.