- USGS Earthquake Hazards Program
 - Learn about current earthquakes and seismological activity in the U.S. and around the world. USGS offers a searchable database of historic earthquakes, preparedness information, seismic maps, and more. - USGS Earthquake Hazards Program - Northern California
- Real time earthquake and shaking maps for California, seismologial activity updates, earthquake probabilities for the San Francisco Bay Area, information on hazards and preparedness, and related resources.
- USGS National Earthquake Information Center
- Mission is to determine location and size of all destructive earthquakes worldwide and to immediately disseminate this information to relevant agencies. Includes a list of current and past earthquakes.
- USGS Earthquake Hazards Program - Southern California
- Offers real-time information and archives of past earthquakes and seismic hazards in Southern California, plus preparedness, research, and monitoring resources.
- Advanced National Seismic System (ANSS)
- Working to provide accurate and timely data and information products for seismic events, including their effects on buildings and structures, employing modern monitoring methods and technologies.
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