Northern California Earthquake Catalog Search

 

Note: The Double‑Difference earthquake catalog currently available at the NCEDC is not generated by the most recent version of the software. It uses a depth datum that is referenced to the closest stations that recorded an event. The current USGS routine location procedure references depth with respect to the geoid. As a result, many event depths, especially those recorded at high elevation stations, may be incorrect.

Users should, for the time being, obtain current, geoid referenced DD solutions from the catalog maintained at Lamont‑Doherty Earth Observatory: https://nocaldd.ldeo.columbia.edu

For Researchers: Metadata for reproducing NCSS locations with Hypoinverse 2000

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Help pages for catalog search

Input Catalog
Output Format
NCSS catalog in readable format
NCSS catalog in Hypoinverse format
NCSS catalog + Phase in Hypoinverse format
NCSS catalog in KML format for input into Google Earth
NCSS catalog in CSV format
NCSS catalog in Cross Sectional Set of Events

Notice: On 10/7/15, the NCEDC changed the depth datum for the NCSS earthquake catalog. Reported depths for all events since 1966 are now referenced to the geoid (sea level). More information
Other info on catalog formats:  Raw catalog & phase

BDSN catalog in readable format
BDSN catalog in raw format
BDSN catalog + Phase in raw format
Fault Plane solutions in Fpfit format
Fault Plane solutions in PSVELO format
Moment Tensors in PSMECA format
Moment Tensors in UCB format
Moment Tensors in CMT Standard format
DD catalog in readable format
DD catalog in Hypoinverse format
DD catalog in KML format for input into Google Earth
DD catalog in CSV format
DD catalog in Cross Sectional Set of Events

(Please refer here for more information on this catalog.)

Earthquake Parameters
Help on date and time parameters
Help on lat/lon parameters
 Earthquakes  Blasts (Quarry or Nuclear)  All Events
Additional Search Parameters
Output Mechanism

Acknowledgements and References

When you use data from the NCEDC, please provide a proper acknowledgementof the data source.

When using the double-difference catalog please use the following two references for the base catalog (1984-2011) and the real-time catalog (2012-present), respectively:

  • Waldhauser, F. and D.P. Schaff, Large-scale relocation of two decades of Northern California seismicity using cross-correlation and double-difference methods, J. Geophys. Res.,113, B08311, doi:10.1029/2007JB005479, 2008.
  • Waldhauser, F., Near-real-time double-difference event location using long-term seismic archives, with application to Northern California, Bull. Seism. Soc. Am., 99, 2736-2848, doi:10.1785/0120080294, 2009.

Questions, Comments, and Feedback

We encourage you to contact us at www@ncedc.org with questions, comments and feedback concerning the NCEDC.

Cite the NCEDC:

"NCEDC (2014), Northern California Earthquake Data Center. UC Berkeley Seismological Laboratory. Dataset. doi:10.7932/NCEDC."

Acknowledge the NCEDC:

"Waveform data, metadata, or data products for this study were accessed through the Northern California Earthquake Data Center (NCEDC), doi:10.7932/NCEDC."

Please insert this sentence in your publication acknowledgments.