Another earthquake has shaken the Rutland town of Oakham, experts have confirmed.
The British Geological Survey (BGS) said early information showed a tremor of 3.5 magnitude just north of Oakham at about 07:50 BST.
On Thursday, residents in and around Oakham were woken by a tremor of 3.2 magnitude just after 07:00 BST.
The BGS said it had received more than 200 reports after Friday's tremor and was gathering more information.
There are no reports of any damage or injuries.
John Kennedy tweeted: "Oakham rock again! 2nd earthquake in two days. Will we get a third?"
BBC Radio Nottingham received a text message from a listener in Colwick saying she had felt the tremor, about 32 miles (51km) from Oakham.
The widely-known Richter scale has been generally replaced by moment magnitude scale (Mw). Richter measured the amount of movement while Mw is based on the force involved.
Mw 1.0 - 30 lb of TNT, eg construction site blast
Mw 2.0 - 1 ton of TNT eg large quarry or mine blast
Mw 3.0 - 29 tonnes of TNT
Mw 4.0 - 1 kiloton of TNT eg small atomic bomb
Mw 5.0 - 32 kiloton of TNT eg Nagasaki atomic bomb
Mw scale goes to 9
Source: British Geological Survey
According to the BGS, Thursday's earthquake originated 2.5 miles (4km) below ground. It was reportedly also felt in Lincolnshire and Northamptonshire.
The BGS has also confirmed the quake was preceded by a much smaller one in Solihull in the West Midlands, which happened at 19:16 BST on Wednesday with a magnitude of 0.9.
On Thursday, Suzanne Sergeant, from BGS, said earthquakes were not "uncommon in the UK".
She added: "They occur as a result of the adjustments the geological structures make to the wider stresses that the UK experiences.
"Although we are not close to any plate boundaries we experience a slight squeezing as a result of the mid Atlantic ridge and the pressures that are put on the fault."
The largest-known British earthquake occurred under the sea near Dogger Bank in 1931, with a magnitude of 6.1.
BGS said the UK was expected to experience a magnitude 5 earthquake about every 10 to 20 years.
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