ANSS Composite Earthquake Catalog
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:
- Search the ANSS Composite Catalog
Use the form to generate your own search of the ANSS Composite Catalog.
- Earthquake maps & lists
Examples of seismicity from the ANSS Composite Catalog.
Copying the ANSS Composite Catalog
The ANSS catalog files are available via anonymous ftp.
ANSS submissions: Input data from the contributing networks
The input data provided by the various networks for the ANSS Composite Catalog are available via anonymous ftp.
Information about the ANSS Composite 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.