An 4.4-magnitude natural disaster centered near Dover, Delaware but could be felt for hundreds of miles along the East Coast.
The USGS initially reported the quake as a 4.4, then a 5.1, before dropping back to a 4,4, and now at 4.1 magnitude.
The quake, initially reported as a magnitude 6.3, was centered 36 miles (58 km) northeast of Kerman, which has a population of more than 821,000.
The last natural disaster to hit the mid-Atlantic was in 2011, when a 5.8 magnitude quake hit about 90 miles southwest of Washington, with shaking felt across much of the East Coast including here in New England. There were no immediate reports of damage or injuries. However, in DE, the quake jolted downtown Dover, sending lawmakers and workers in the statehouse outdoors to see what happened.
It was followed by two less powerful 5.0 and 5.1 aftershocks in the same area, the survey said.
Paul Caruso, a geophysicist with the USGS's natural disaster information center in Colorado, said he didn't expect any significant damage from the small quake, which he described as unusual.More news: Cyber Monday 'largest online sales day in history'
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This 4.4 was the most powerful quake in the last six months.
The Maryland Emergency Management Agency has no reports of damages in the state.
An even more powerful natural disaster struck DE before that, according to UD, but that was before scientists took measurements.
The USGS downgraded the quake from a 5.1 to a 4.4 on the Richter scale.
The USGS has revised the magnitude down from 5.1.
The USGS reports the temblor's effects were felt in several states, as far west as West Virginia and as far north as Pennsylvania and CT.