Did you feel it? In the early afternoon of August 23, 2011, millions of people across the East Coast felt shaking from a magnitude 5.8 earthquake near Mineral, Virginia. The earthquake occurred in what is known by scientists as the Central Virginia Seismic Zone, which has a long history of occasional earthquakes. Identifying the locations and magnitudes of past earthquakes and the likelihood of future earthquakes in the region is an area of active research by U.S. Geological Survey (USGS) scient