People from across large parts of England have reported an earth tremor.
The BBC has received calls from people in Yorkshire, the West Midlands, Manchester, Berkshire, London and Gloucestershire about a "quake".
The tremor could be felt in central Birmingham at about 0100 GMT but it is unclear if it has caused any damage.
The US Geographical Survey's website reported a quake of the magnitude of 4.7 and said the epicentre was 30 miles (50km) south of Kingston-upon-Hull.
The West Midlands was hit by an earthquake in 2002 in the Dudley area that reached a magnitude of 5.0 and caused damage to homes.
Jemma Harrison, 22, in Bury, Greater Manchester, said: "It was really bad. I was fast asleep and woke up and the room was shaking and there was a loud bang and alarms were going off."
Natasha Cavey, in Tipton in the West Midlands, said: "All my cupboard doors flew open and the whole house shook, it was unreal. I can't believe it."
David Somerset, 41, from Driffield near Beverley in East Yorkshire, said: "I have never felt one as strong as that one before. I was in my sitting room and the grandfather clock was rattling rather violently.
"It was very strong, I felt the whole room moving."
