A 3.1 magnitude earthquake has struck an area of Scotland, shaking houses and jolting residents out of bed.
Startled residents took to social media to report the early hours disturbance shortly before 2am on Tuesday.
The epicentre of the quake was near the town of Lochgilphead, north west of Glasgow, and was confirmed to have a magnitude of 3.1.
More than 30 people reported to the United States Geological Survey that they had felt the tremor, with reports coming from as far as Edinburgh and Ballycastle in Northern Ireland.
Nearby residents said their homes shook during the tremor.
One said: "Nothing like an earthquake to jolt you up. That's the biggest one I've felt. Whole house shook."
They added: "I'm in Tarbert Argyll. I've never felt one that big, everything in my room shook."
Another said: "Argyll earthquake was around 7km from Lochgilphead and felt widely across Argyllshire. Possible 4.2 magnitude which would make sense for reporter duration."
One person said on social media they were woken up by 'shaking and rattling' while another said it was widely felt across the region, including in Oban, Inveraray and Tarbert.
The United States Geological Survey says the quake was a 10km deep 3.1 size tremor.
It is said to have struck at 1.44am about 11 miles northwest of Lochgilphead.
The latest tremor in the UK comes a month after an earthquake was felt in north Wales.
People in Snowdonia had their Sunday night interrupted by an earthquake which caused a "big rumble sound."
The British Geological Survey (BGS) confirmed the area had suffered a mini earthquake measuring 1.0 on the Richter scale.
It was recorded at a depth of 6km with the epicentre given as "3km north-north-east of the village of Dolgarrog, Conwy".
In September last year Leighton Buzzard, Bedfordshire was hit by three earthquakes in just two weeks as part of a 'swarm' of tremors.
A 3.0-magnitude quake in the town sparked a flurry of questions from concerned residents about the cause of the town's quakes.
According to the British Geological Survey between 200 and 300 earthquakes are detected in the UK every year.
Earthquakes that occur on the mainland with a magnitude of between 3 and 3.9 happen on average every three years.
Larger magnitude five quakes occur on average every eight years, say experts
