San Andreas Fault  sign

Who We Are:

Six organizations have collaborated to form the CISN in order to further the goals of earthquake monitoring. Members of the CISN include: California Geological Survey, Caltech Seismological Laboratory, Berkeley Seismological Laboratory, USGS Menlo Park, USGS Pasadena, and the California Governor's Office of Emergency Services.

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Realtime earthquake activity

Earthquake Activity:

Find real-time earthquake events within the last seven days in California.

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Napa Shakemap


The CISN provides reliable monitoring and continuous reporting of all significant earthquake activity in California. The CISN distributes notification of earthquakes electronically through the Web and through other means.

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CISN Projects: Earthquake Early Warning

For more than 10 years, people in Japan have received an alert when a big earthquake has started and they will imminently experience strong shaking. A similar "Earthquake Early Warning" system, called ShakeAlert, is now available in California and the Pacific Northwest using CISN infrastructure. With political will, scientific effort, and investment in infrastructure, alerts are now publicly available to all US West Coast residents.

Kids underneath a table in response to earthquake drill

CISN Products: Earthquake Information on Your Phone

Have you wondered whether that loud noise was from a nearby earthquake? Do you want to be one of the first to know when a big quake is likely to have caused a tsunami or extensive damage? Sign up for the Earthquake Notification Service hosted by the USGS. You can chose the regions and magnitudes for which you will receive information by email and/or text message.

Graduate student Qingkai holds phone