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Global, national and regional networks recording earthquakes and crustal movements, maps, station information, and realtime seismic waveforms.
Sources/Usage: Public Domain.
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.