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."
1787 Boricua earthquake
The 1787 Boricua earthquake struck the island of Puerto Rico on May 2. The magnitude of the earthquake is believed to have been of 8.0–8.5; however, that might not be an exact number. The epicenter is thought to have been somewhere north of Puerto Rico, probably on the Puerto Rico Trench. Puerto Rican geomorphologist José Molinelli considers it "the strongest" in the seismic history of the country.