Felt earthquake on 8th August
Many of you will have heard on the news, and some of you may have experienced first-hand, a felt earthquake a few minutes before 6pm on Thursday 8th August. It was detected on our seismic monitoring system (below) and on the British Geological Survey (BGS) national monitoring network.
We also picked it up on our ‘Raspberry Shake’ installations; two in schools in Truro, one in Falmouth and one in Penzance.
The BGS interpretation of the event puts the epicentre 7km to the southwest of Helston. It was about 5km deep and had a magnitude of 2.3.
This was a natural event and the UK gets about 15 of this size or larger each year. Globally, there are about 700 every day.
It was about the same size as the largest event we have recorded since our monitoring system became operational in May 2018. That was a magnitude 2.3 event near Constantine in September. But, unlike the Constantine event, this one was heard and felt quite widely, with several people initially mistaking it for thunder.
The BGS web page showing UK earthquakes in the last 50 days is here: