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Northern California Earthquake Data Center

8/24 M6.0 South Napa Quake

Information on the August 24 South Napa quake is available via the Berkeley Seismological Lab's web page or Twitter feed.


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The Northern California Earthquake Data Center (NCEDC) is a permanent archive and distribution center primarily for multiple types of digital data relating to earthquakes in central and northern California. The NCEDC is located at the Berkeley Seismological Laboratory, and has been accessible to users via the Internet since mid-1992. The NCEDC was formed as a joint project of the Berkeley Seismological Laboratory (BSL) and the U.S. Geological Survey (USGS) at Menlo Park in 1991, and current USGS funding is provided under a cooperative agreement for seismic network operations.

World map of NCEDC data distribution
World map of NCEDC data distribution (Click to view larger.)

Time series data come from broadband, short period, and strong motion seismic sensors, and geophysical sensors such as electromagnetic sensors, strain meters, creep meters, pore pressure, water level, and wind speed sensors. Earthquake catalogs can include time, hypocenter, magnitude, moment tensor, mechanisms, phase arrivals, codas, and amplitude data. GPS data are available in both raw observables and RINEX formatted data.

The NCEDC also provides support for earthquake processing and archiving activities of the Northern California Earthquake Management Center (NCEMC), a component of the California Integrated Seismic Network (CISN). The CISN is the California regional organization of the Advanced National Seismic System (ANSS).

The NCEDC is managed by Douglas Neuhauser under the direction of the BSL Director Richard Allen. Stephane Zuzlewski, Mario Aranha, Ingrid Johanson, Taka'aki Taira, Jennifer Taggart, Clay Miller, and Peggy Hellweg of the BSL and David Oppenheimer, Hal Macbeth, Lynn Dietz, and Fred Klein of the USGS Menlo Park contribute to the operation of the NCEDC.

If you use data from the NCEDC, we ask that you acknowledge the data center and the organizations that contributed the data.

We encourage you to contact us with questions, comments and feedback concerning the NCEDC. You can reach us vis email at ncedcinfo@ncedc.org or fill out our comments form.