A rare 3.6-magnitude quake rattled Washington and the surrounding area early yesterday, startling locals but failing to rouse the commander-in-chief from his slumber in the White House.

The quake struck 35 kilometres northwest of the US federal capital, in the state of Maryland, at 5.04 a.m. (0904 GMT) the US Geological Survey said.

It was felt by residents living and working in downtown Washington near the White House, but not apparently by President Barack Obama.

Asked if he felt the pre-dawn shaking, Mr Obama told reporters, "I didn't."

The event prompted a flood of calls to emergency services, officials told the Washington Post, which headlined its coverage "Yes, that was an earthquake."

The USGS received thousands of reports about the quake, including from states as far away from the epicenter as Georgia, Wisconsin and New York.

Earthquakes are unusual on the US east coast, and there is no record of a temblor ever having been centred in the US capital.

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