The BGS said the quake was of magnitude 4.4, with an epicentre 20 km (12.5 miles) north of the Welsh city of Swansea, adding that it was the biggest quake in the Britain since 2008.
Earthquakes are not common in Britain and are rarely powerful. The 2008 quake in Market Rasen, north-east England, was magnitude 5.2 - 16 times more powerful than Saturday's quake.
However, Saturday's earthquake in Wales was felt as far away as Carisbrooke Castle on the Isle of Wight, over 200 km (125 miles) away.
"Thank you to everyone who attended our visit day. We hoped that you had a surprisingly 'earth moving' experience!" Swansea University said on Twitter.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
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