Shaking was felt as far north as New York City and as far south as Washington, D.C. from a preliminary magnitude 4.4 quake that struck just before 5 p.m. Thursday northeast of Dover, Delaware.
A strong quake of magnitude 6.0 has struck southeastern Iran near the city of Kerman, the US Geological Survey says. It was hard to immediately predict if there would be aftershocks, she said.
A 2011 Virginia natural disaster, that measured a much larger magnitude 5.8, was felt from North Carolina to even Canada. No damage was reported.
The natural disaster also grazed through parts of Maryland.
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SSgt Aaron Jenne with Dover Air Force Base Public Affairs said he and others weren't sure what it was when it happened, but everyone is thankful that it wasn't worse and for it being so close there was no damage.
"I turned around and one of my co-workers was coming down the hall with the big-eyes look", he said.
"I was talking with the other seismologists and we said, 'Wow, we don't ever remember a quake in DE", he said.
"I was sitting in bed watching TV and I felt the bed shaking and it was pretty scary", said Rebecca from Dover.
For some area residents, the event stirred memories of a magnitude 5.8 quake - centered in Louisa County, Virginia - that rocked much of the eastern United States in August 2011. It caused damage to public buildings, pipes and monuments, most notably the National Cathedral and the Washington Monument.