An quake centered 6 miles east-northeast of Dover, Delaware, hit the Mid-Atlantic region late Thursday afternoon, shaking buildings and people, but causing no apparent damage.
The quake struck at a shallow depth of 10km (6.2 miles), some 60km (37 miles) from the city of Kerman, which has a population of over 800,000, including suburbs.
The U.S. Geological Service reported intensity levels - a different measurement than magnitude - ranging from 3 (weak) to 5 (moderate) throughout Delaware.
The natural disaster hit at 4:47 p.m.
There have been no immediate reports of damage or injury.
The track, known for its Miles the Monster mascot and its reputation as one of NASCAR's toughest venues, responded to the natural disaster with trademark bravado in a tweet.
Thursday's quake was felt as far north as NYC and as far south as the D.C. area.
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FOX 5 viewers have reported feeling the natural disaster in the District, Maryland, including Prince George's County and Montgomery County, and in Virginia, including Prince William County and Fairfax County.
"I felt the whole house nearly like waving", he said.
The quake jolted downtown Dover, sending lawmakers and workers in the statehouse outdoors to see what happened. "Usually the largest aftershocks we see in a series is about 1 magnitude smaller than the main natural disaster".
Martin Pagliughi, coordinator of the Cape May County Office of Emergency Management, said he felt the tremors. Carberry, who is from the West Coast, said she told co-workers, "I'm pretty sure this is an natural disaster".
Caruso said he didn't expect any significant damage, given the small size of the quake.
For some area residents, the event stirred memories of a magnitude 5.8 natural disaster - 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.