Global, national and regional networks recording earthquakes and crustal movements, maps, station information, and realtime seismic waveforms.
Earthquake Intensity. Exploring Earthquakes and the Modified Mercalli Scale
The California Geological Survey studies earthquakes to help Californians plan and build earthquake resistant communities. We record the strong ground motion from earthquakes, study the distribution of historic earthquakes and evaluate faults that are the source of earthquakes. We combine that information to prepare maps showing the potential for ground shaking, fault rupture, liquefaction and seismically induced landsliding.
Earthquakes in the past 7 days of magnitude 4.0 or greater
An earthquake swarm is a sequence of seismic events occurring in a local area within a relatively short period of time. The length of time used to define the swarm itself varies, but may be of the order of days, months, or even years. Such an energy release is different from what happens commonly when a major earthquake (mainshock) is followed by a series of aftershocks: in earthquake swarms, no single earthquake in the sequence is obviously the mainshock. In particular, a cluster of aftershocks occurring after a mainshock is not a swarm
Arkansas swarm
Enter the latitudes and longitudes using decimal degrees and negative numbers to represent West and South directions.