The natural disaster occurred at 2:30 p.m. Saturday at depth of 4.5 miles about 12.5 miles northeast of Swansea, according to the BGS.
The BGS said an event of this magnitude only occurs once every two to three years in the UK.
The UK has been hit by its biggest quake in ten years, the British Geological Survey has confirmed.
Alex from Swansea added: 'I could feel the building moving and I looked out the window and could see the cars outside shaking'.
What is thought to have been the biggest natural disaster in the United Kingdom for a decade has been felt across Cornwall.
Ann Lewis, from Aberdare, also told the newspaper: "I'm just a bit shook up, it was very odd".
This image shows the impact in Wales. Credit British Geology Survey
Thousands of people reported to have felt the tremors on Saturday afternoon..
It's extremely rare that the British Isles are hit by an natural disaster and when one does hit, it's never strong enough to cause much damage *touch wood*.
Dyfed Powys Police said it was getting "an extremely high call volume" about the tremor but told people: "There is nothing to worry about". "Thought i was going mad".
RESIDENTS across the region have been shaken by an quake in the UK.
Did you feel the quake in Berkshire?
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