Mild earthquake felt across region

Mike McPhate
Washington Post Staff Writer
Friday, July 16, 2010; 6:36 AM

The U.S. Geological Survey reported a 3.6 magnitude earthquake centered in Montgomery County at 5:04 a.m. Friday.

The epicenter was in Gaithersburg near the intersection of I-270 and Route 124 (39.145°N, 77.222°W), USGS reported in a preliminary finding. Its depth was 3.1 miles.

Authorities in the District and Montgomery and Arlington counties said there were no reports of damage, though many residents were dialing 911 to report the rumbling.

"We are getting flooded with calls," a Montgomery County police spokesperson said.

No traffic or transit delays were reported by local transit agencies, and the quake seemed unlikely to have any effect on the morning rush.

Amy Vaughan, a spokesperson for USGS, said the quake was the largest recorded within about 30 miles of Washington since a database was created to track such activity in 1974. Previously, the largest earthquake reported during that time period was a 2.6 magnitude tremor in 1990.

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