The British Geological Survey says there was a magnitude 5.4 earthquake in the area in 1984.
It describes that year's event as "significant".
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Kenyans Eliud Kipchoge and Vivian Cheruiyot won the men's and women's races respectively, in a scorching hot London Marathon.
Most areas will have a dry night with some clear spells.
The collision took place on the A525 Denbigh bypass at around 11pm and involved a blue Porche Cayman.