Loading earthquake data...
Real-time earthquake tracking and seismic analysis for the San Francisco Bay Area, powered by USGS data.
Bay Tremor provides Bay Area residents with comprehensive, real-time earthquake information to help communities stay informed about seismic activity. We believe that access to timely, accurate earthquake data helps people understand their local seismic environment and make better preparedness decisions.
Living in one of the most seismically active regions in the United States, Bay Area residents experience hundreds of earthquakes each year. Bay Tremor makes this data accessible, understandable, and actionable.
Live earthquake data updated continuously from the USGS seismic network, typically within minutes of an earthquake occurring.
Specialized coverage of all 9 Bay Area counties plus San Benito across 12 distinct regions, from San Francisco to Sonoma, with local context for each area.
Automatic detection and analysis of earthquake swarms, helping you understand patterns in local seismic activity.
Access to years of historical earthquake data for trend analysis and understanding long-term seismic patterns.
Continuous data updates around the clock, ensuring you always have access to the latest seismic information.
Educational resources and links to official preparedness guidelines to help you stay ready for the next earthquake.
Bay Tremor uses earthquake data from the United States Geological Survey (USGS), the official source for earthquake information in the United States.
The USGS operates the Northern California Seismic Network (NCSN), a dense network of seismometers that monitors earthquake activity throughout the Bay Area. This network can detect earthquakes as small as magnitude 1.0 in most areas.
We monitor seismic activity across the entire San Francisco Bay Area, with specialized coverage for these regions:
Bay Tremor is an informational service and should not be used as an emergency alert system. For official earthquake alerts and emergency information, please refer to the USGS, local emergency services, and official early warning systems like ShakeAlert. Earthquake data is subject to revision as analysts review recorded data.
Ready to explore earthquake activity in your area?