2011 Virginia earthquake
The USGS found that the farthest landslide from the 2011 Virginia earthquake was from the epicenter. This is by far the greatest landslide distance recorded from any other earthquake of similar magnitude. Previous studies of worldwide earthquakes indicated that landslides occurred no farther than from the epicenter of a magnitude 5.8 earthquake. The study suggested that the added information about East Coast earthquakes may prompt a revision of equations that predict ground shaking. "What makes this new study so unique is that it provides direct observational evidence from the largest earthquake to occur in more than 100 years in the eastern U.S. Now that we know more about the power of East Coast earthquakes, equations that predict ground shaking might need to be revised."
2009–19 Oklahoma earthquake swarms
Two of the most significant earthquakes in these swarms were the November 5, 2011 Prague earthquake east of the Oklahoma City area and the September 3, 2016 earthquake near Pawnee, north of Prague. The 2011 Prague earthquake, at reported magnitude 5.6, was at the time the strongest recorded earthquake in the history of Oklahoma. The 2016 earthquake was initially reported to be an identical 5.6 magnitude, but this was later upgraded to 5.8, making it the strongest earthquake on record. Simultaneously, the USGS upgraded the magnitude of the Prague earthquake to 5.7. Numerous seismologists had advised local residents of an even greater risk of earthquakes in 2014, by which time the number of earthquakes had increased to a dangerously high level. In response to the major increase in earthquakes in the Central United States, the United States Geological Survey (USGS) began developing a new seismic hazard model to account for risk associated with induced seismicity. By June 26, 2014, no fewer than six individual earthquake sequences in Oklahoma had been identified and named by the Oklahoma Geological Survey (OGS). Other swarms have been observed in south-central Kansas and North Texas.