About the Maps
- Background Seismicity
- Moment Tensor Solutions
- Historical Earthquakes
- Special Region Maps
- Map Details
- Acknowledgements
- Seismicity Maps
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Earthquakes on the seismicity maps are drawn from the ANSS composite catalog. For California and Nevada, contributing networks include USGS Menlo Park/UC Berkeley, USGS Pasadena/Caltech, and UN Reno. The events plotted represent earthquakes of M1.8 and higher from 1970-2003. Events with magnitude less than 5 are plotted as points; events with magnitude greater than 5 are plotted as open squares.
- Moment Tensor Maps
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The moment tensor maps illustrate the beach balls which indicate the style of faulting. Solutions plotted are derived from the Harvard Centroid Moment Tensor project and from the UC Berkeley Regional Moment Tensor catalog. The different colors indicate different types of fault mechansisms. Animations illustrating fault movement are available at the IRIS Web site.
- Historical Earthquake Maps
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The historical earthquake maps are generated from the catalog compiled by Bill Ellsworth, with more recent events added. The color of the event indicates the century of its occurence.
- Under Development
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- We are currently working on the following improvments:
- Links to special event pages
- Maps including seismic stations
- Consistency with the recenteqs maps scaling
- We are currently working on the following improvments:
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Northern California Earthquake Data Center
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Copyright 1995-2003, The Regents of the University of California.
Last modified: Wed Oct 29 08:42:07 PST 2003