Distribution of Global Seismographic Network (GSN) stations in 2015. (Public domain.)

NEIC - National Earthquake Information Center
The NEIC determines the location and size of all significant earthquakes worldwide, disseminates the information immediately, maintains an online database of seismic information, and performs research.

ANSS - Advanced National Seismic System
The United States seismic network.

GSN - Global Seismographic Network
The worldwide seismic network.

Volunteer Monitoring
Opportunities for you to host a seismometer in your private home, business, public building or school.

Seismogram Displays
Real-time waveforms from all over the world.

NSMP - National Strong Motion Project
Seismic stations for strong motion records on the ground and in man-made structures.

Crustal Deformation Monitoring
Monitoring of slow crustal movements.

U.S. Regional and Cooperating Networks

Central U.S.

• St. Louis University Earthquake Center
• University of Memphis (CERI)

Eastern U.S.

• Lamont Cooperative Seismic Network (LCSN)
• MIT Global Seismology Laboratory
• Puerto Rico Seismic Network, University of Puerto Rico
• University of South Carolina

Western U.S.

• Alaska Earthquake Information Center
• Alaska Volcano Observatory
• Cascades Volcano Observatory
• California Integrated Seismic Network (CISN)
• Hawaii Volcano Observatory
• Montana Bureau of Mines and Geology
• Nevada Seismological Laboratory
• Northern California Earthquake Data Center (NCEDC)
• NOAA West Coast and Alaska Tsunami Warning Center
• Pacific Northwest Seismograph Network
• Southern California Earthquake Data Center (SCEDC)
• University of Utah Seismograph Stations

See also:

• Contributors to the Preliminary Determination of Epicenters (PDE) Catalog
• International Registry of Seismograph Stations - registered stations worldwide
• Geophysics Institutions Throughout the World
• Consortium of Organizations for Strong-Motion Observation Systems (COSMOS)
• USArray