Its epicentre fell around eight miles northeast of Swansea city centre.
There were no immediate reports of major damage.
The British Geological Survey (BGS) said the epicentre was 20km (12 miles) north of Swansea, with a 4.4 magnitude at a depth of 7.4km (4.6m).
The Welsh League match between Port Talbot was temporarily delayed after the tremor just after 14:30 GMT on 17 February.
Play had to be stopped, with the club's Twitter account reporting: 'Temporary stop in play.
Sky's Kay Burley felt the effects of the tremor near a lake in the Cotswolds: "The dogs were laying down then suddenly they jumped up and ran to my side, and then I noticed quite a significant ripple on the water. The dogs are not happy at all though", she said. "It was like 'Ooh, what was that?'"
There were also reports in north Wales, with some claiming they felt the tremor in Broughton, Flintshire, and Llangollen, Denbighshire.
A magnitude 4.4 natural disaster felt in parts of Britain Saturday was its strongest in a decade.
"My desk was moving independently of itself and there was a low rumble. We hoped that you had a surprisingly "earth moving" experience!" "It didn't last more than about 10 seconds but it was the strangest sensation I've ever experienced".