The British Geological Survey has received more than 100 reports from people who felt the earthquake, most of whom were within a 100km radius.
The epicentre of the earthquake in the Irish Sea was 15km away from Abersoch.
More top news
After shock results suggesting that the Conservatives were ahead in Wales, the latest Welsh Barometer poll puts Labour back in the lead.
Gwent Police received calls of a distressed woman in Caerphilly area in the early hours of Saturday.
Welsh Labour has promised to establish a "real partnership" with a Jeremy Corbyn-led UK Government, as it launched its own manifesto.