There was a magnitude 4.4 earthquake at 14:31 today.

Epicentre was a couple of km south of  Cwmllynfell, South Wales. This is only about 10km from Dan yr Ogof.

http://www.earthquakes.bgs.ac.uk/earthquakes/recent_events/20180217142554.html

I hope there's no significant damage and more importantly, no injuries.

Weird - it seems to be posted at varying locations and depth, depending where you look. BBC says under Bristol Channel at the moment, but the BGS and USGS both say north of Swansea. But USGS says 11km deep, BGS says 7km, whilst BBC says 5km!