Lleyn peninsula hit by earthquake of 2.8 magnitude
- 27 June 2013
- From the section Wales
A small earthquake measuring 2.8 in magnitude hit north Wales late on Wednesday night, the second small earthquake to affect the area in a few weeks.
The tremor centred on the Lleyn peninsula, Gwynedd, but was felt throughout north Gwynedd, said the British Geological Survey (BGS).
A small earthquake of 3.8 in magnitude was felt in the area last month.
A smaller tremor measuring 0.9 was also recorded on Wednesday in Blaenau Gwent.
Elfed Morgan, 40, of Efailnewydd near Pwllheli, said friends on Facebook had also felt the tremor across the Llyn peninsula.
"I heard this noise and I thought the little boy was getting up from his bed because we've just put him in his cot bed," he said.
"I was on the computer at the time and I heard the floorboards going in the house but when we went upstairs he was asleep.
"When I looked on Facebook, everybody heard it across the Llyn peninsula area.
"It makes you wonder and a bit scared really. It's very unusual to get it in the same spot."
He said friends as far as Llanberis in Snowdonia had also heard it.
BGS said the tremor happened at 23:28 BST, 8km (five miles) underground, off Porth Colmon, and was felt in Bangor, Caernarfon, Blaenau Ffestiniog and Holyhead on Anglesey.
There were two tremors 30 seconds apart and the BGS is looking into the possibility there was a third.
On Wednesday evening, BGS said a separate tremor was felt at Brynithel, Blaenau Gwent, at around 21:00 BST.
On 29 May, a small earthquake measuring 3.8 magnitude happened just half a kilometre away, followed by several smaller tremors on successive days.
Julian Bukits, of the BGS, said north Wales was one of the more seismically active areas of the United Kingdom.
"It's always been active. It's no more active than it was 100 years ago or 1,000 years ago," he said.
"We get them in north Wales regularly."
He said there had been 70 reports from people about the tremor so far, compared to 480 reports for the larger tremor last month.
"A 3.8 magnitude is more widely felt - that one was felt over distances up to 150km away while this one is 90 to 100km," said Mr Bukits.
"Also, the 3.8 magnitude is 32 times more powerful in terms of energy than the 2.8 magnitude."
The latest tremor is just a few miles from the point on the Llyn peninsula where an earthquake struck in July 1984 with a magnitude of 5.4.
It was the most powerful recorded in mainland Britain in the past 200 years.