BBC website readers have been describing their experiences of an earth tremor felt across large parts of the UK at about 0100 GMT on Wednesday.
ANDY SENIOR - LUDFORD, LINCOLNSHIRE
We had just gone to bed and felt the whole house shake violently. Our dogs were barking and our cockatoo was agitated. We have looked on the BBC website for Lincolnshire this morning and discovered that the epicentre was below our small rural village. Everyone is talking about it this morning. No-one can quite believe it.
ADAM WILSON - COTGRAVE, NOTTINGHAM
I was lying in bed playing poker online. I felt the window start to vibrate for a few seconds and then it carried on and I was thinking "come on, stop now". I was a bit nervous, my blinds were making a racket. It probably lasted 10 seconds but felt much longer.
I walked around to check damage and noticed a crack in the kitchen. We do a lot of decorating so I know it was as a result of the tremor.
GUY ROBINSON - SHEEPY MAGNA, LEICESTERSHIRE
Our house shook gently for five to 10 seconds with a short spell of significant vibration. The wardrobe doors banged during this period, which subsided to another five to 10 seconds and then peace again. It was very scary - we have a small baby that my wife and I were worried for.
PETER THORP - POYNTON, CHESHIRE
I was just about to shut down my computer when the quake occurred at just after 0055, the weird thing was that there was no noise when it started, the room just started shaking and the chair I was sat on started moving on its casters.
There was then the noise of the house shaking and the illusion of the room moving, I would have said it lasted for five to 10 seconds, but for at least the same time again the lamp in my room continued to shake.
SIMON WHITELEY - LYTHAM ST ANNES, BLACKPOOL
I've just felt an earthquake. Shook the whole apartment building for about 10 seconds, appears to be no damage. Very concerning as I live next to the airport 1,000 yards from the sea. Strange experience - was like someone was shaking my bed quite violently.
EDWARD PALUSINSKI - RUGBY, WARWICKSHIRE
I live in Rugby and the tremor was quite severe. It was about the same as the Dudley quake in 2002 which was 5 on the Richter scale. I cannot understand why Dr Brian Baptie, of the BGS, said: "An earthquake of this size, of magnitude five or thereabouts, will occur roughly every 10 to 20 years in the UK" when the last one was only six years ago.
LYNETTE - MALVERN, WORCESTERSHIRE
Just been woken by our computer monitor and desk and whole bedroom shaking. Just before 1am, very similar to the earthquake in 2002. Neighbours' children were woken up by it too and started crying with fear. My daughter slept right through it.
MARGARET MASON - HARROW, NORTH WEST LONDON
I was asleep in bed. I was awoken by the sensation of my room shaking and it lasted for five to 10 seconds. My first thought was that there was an intruder thumping about in my room; my second thought was that it was a poltergeist. Then I realised that there was no noise, only vibration.
I only realised some hours later that there had been an earthquake.
PHIL - MILTON KEYNES, BUCKINGHAMSHIRE
It felt as though someone was shaking the sofa, when I realised the whole room was moving I jumped up and looked out of the window. I noticed lights coming on all down the street and then it stopped as suddenly as it started, a very strange experience.
DAVID RENDELL - BERKSHIRE
I thought I was getting a bit giddy or something. I was just sitting in a chair doing some work and suddenly the whole place seemed to be moving a bit and I thought I must just be getting giddy but it turned out that it really was an earthquake.
HELEN BROWN - KING'S LYNN, NORFOLK
We were woken just before 1am, our old house was really shaking. We were not sure what was going on. At first we thought it could be a lorry on the road but it lasted too long for it to be that.
GRAHAM - SHEFFIELD, SOUTH YORKSHIRE
I've just sat through an earthquake. Pretty weird for the UK I think. Scared the hell out of me, must have been around 12:55am. I am on the fifth floor - everything started shaking and there was a rumbling.
JULIAN COLLIER - CARRONSHORE, SCOTLAND
In bed reading just before 1 am and felt tremors like a train passing outside my first floor flat, looked to see if any large vehicles were outside and didn't think much of it at the time!
IAN WALKER - ABERGELE, CONWY
It was felt here - I was talking to a friend in Macclesfield - they seemed to feel it about 30 seconds before it reached me 75 miles away - which means it was travelling at above 2,000 miles an hour. Wicked!
TINA GRIFFITHS - WREXHAM, NORTH WALES
I was just getting into bed when I heard a relatively loud noise, the whole room started shaking, my bed (which is solid to the floor) started shaking, car alarms went off. Even my wardrobe shook. My neighbour's child fell off his bunk bed, but was unhurt. I remember a similar experience as a teenager.
LEIGH COCKER - EXETER, DEVON
My whole house just shook... I didn't know what on earth was happening and ignored it as we often get trucks that drive past our house. But this seemed bigger though.
KIM HAMILTON - GREYABBEY, NORTHERN IRELAND
My husband and I felt the tremor while we were in bed. The bed, wardrobe doors, etc in the bedroom all shook. It felt like a number of heavy lorries driving passed our home - but worse.