The earthquake rattled Philadelphia and registered a magnitude of 4.6, according to earthquake detector website CSEM-EMSC. It was earlier recorded at 5.1.
Citizens from major cities including Philadelphia, New York, Washington DC, Baltimore and Atlantic City recorded shaking.
The quake hit Delaware at around 9.45GMT. It was relatively shallow at a depth of less than five miles.
Testimonies flooded in to CSEM EMSC from civilians shaken up by the earthquake.
One person in Bridgeton said: “The whole house was shaking.”
Another person in Middletown said: “It felt and sounded like very deep thunder. It was scary to say the least.”
A third in Broomall said: “Dog freaked out! We thought the wind was shaking the house but then realized there was no wind.
“We were feeling the shake and hearing a rumble. Lasted about 20 seconds.”
One person even said they thought “a vehicle had hit the building at first”.
This is a breaking story, more to follow…