A small tremor was felt in the Blackpool area at about 3.30am, a spokesman for Lancashire Police said.
He said the force had received "numerous" calls about properties shaking, but no damage had been reported.
The British Geological Survey recorded the Blackpool earthquake with a magnitude of 2.2 on the Richter scale.
It follows an earthquake measuring 3.5 which struck in Coniston, Cumbria, on December 21 last year in which no injuries or damages were reported.

Shame Blackpool didn't get knocked down.