|ORIGIN TIME||13:21:30.0 UTC|
The magnitude 4.1 ML Bristol Channel earthquake occurred on the 20 February 2014 at 13:21 UTC with an epicentre approximately 18 km NNW of Ilfracombe, Devon, and 33 km SW of Swansea, Wales. This was the largest earthquake to have occurred in the vicinity since a magnitude 3.6 ML earthquake off Hartland Point on 31 May 2001. The estimated area over which an earthquake with a magnitude of 4.1, and depth of 3 km, would be felt was calculated to be a distance of up to 200 km from the epicentre (at intensities of up to 2 EMS). Analysis of the results from an automatic online questionnaire survey agrees with this. Of the 315 felt reports received from members of the public, almost all of them came from within a distance of up to 125 km from the epicentre, namely from the whole of Devon, Somerset, western Gloucestershire, Glamorganshire and Monmouthshire. A few reports were received from around Cheltenham, Swindon and Guilford (between 150 and 250 km to the east of the epicentre). Single reports were also received from near Telford (185 km to the north) and Rhyl (220 km to the northeast) (see map).
Most people described the shaking strength of the earthquake to be either weak or moderate, with mainly a trembling effect, whilst others described the effect as swaying or jerky. About half of the reports described the sound strength as being faint-moderate. About one third of the reports stated that windows rattled and/or crockery and furniture shook. Reports described “felt like the vibration of a large vehicle passing the building”, “water in bottle swayed from side to side”, “pots on balcony rocked”, “my heavy office desk lifted and shook”, “slight movement of settee where I was seated”, “clock chimes resonated”, “the whole house seemed to move/wobble back and forth a few times”, “windows and glass cabinet shook” and “felt like someone was shaking me as I sat on the sofa”.
Updated 28 February 2014 10:15 UTC