There was an "overflow" of people who called 911 in Roanoke after an earthquake hit the Roanoke, Va., area early Saturday morning, emergency dispatchers said.
Immediately after the quake, which was recorded at 4:08 a.m., the USGS originally said that it had registered a 2.6 magnitude and that the epicenter was about 4 miles west-southwest of Roanoke, near the Cave Spring area, The Roanoke Times reported.
Later, the USGS reported that the quake was a 2.8 and that the epicenter was 3 miles from Roanoke.
No damage or injuries have been reported, according to officials.
Earthquakes of this intensity usually do not cause much damage, according to the National Earthquake Information Center. Sometimes called microearthquakes, they often are only detected by seismographs and not felt by people.
By 5 a.m., the Earthquake Information Center's Web site listed more than 100 reports of weak or light shaking in Roanoke, Vinton and Salem.
The largest earthquake in Virginia, in both intensity and extent, happened in Giles County, Va., on May 31, 1897. Geologists estimate that it ranked 5.9 magnitude.
