About Shock Wave
In physics, a shock wave, or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium.
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Earthquake: Brynmawr, Cardiff and valleys feel tremors
An earthquake has shaken parts of Wales overnight.
The British Geological Survey (BGS) said the 3. 7 magnitude quake happened at 23:59 GMT on Friday. The epicentre was just north of Brynmawr, Blaenau Gwent , and west of Crickhowell, Powys.
BBC journalist Alex Humphreys said she felt the " mini earthquake" in Cardiff, 30 miles (50km) away.
Gwent Police said it had received " multiple calls" overnight but it was " business as usual" for The Force .
The BGS said the earthquake was 1. 8 miles (3km) under The Earth 's surface.
" My whole bed shook, " Ms Humphreys. Others described it as a experience.
The was in the North Sea on 7 June 1931, with a magnitude of 6. 1.
The epicentre was in the Dogger Bank area, 75 miles (120km) north-east of Great Yarmouth , Norfolk .
was on the Llyn Peninsula , Gwynedd, in 1984.
Measuring 5. 4, it began at a depth of More Than 12 miles (20km) and created a Shock Wave that could easily have caused major structural damage.
The BGS said smaller quakes were not unusual in Wales, with 70 measuring More Than 3. 5 between 1727 and 1984.
Listeners told that they felt the " earth shake" in Ebbw Vale , which brought people out of their homes and into The Streets .
Robert Griffiths , from Rhiwbina, Cardiff, said he had just sat down to watch TV after a Night Out when " all of a sudden the whole house shook".
" The ceiling creaked, we immediately turned the television off and thought 'what on Earth was that?'
" It was kind of like 20 trucks had driven in front of The House so it was most unusual and quite strange. "
Elsewhere, Cat said she " thought we were going mad" in Blaenavon, Torfaen, as her " bed and house shook side to side".
" My husband ran downstairs to see what was going on, " She Said .
Related TopicsSource of news: bbc.com
