1984 Llŷn Peninsula earthquake
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| Date | 19 July 1984 |
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| Magnitude | 5.4 ML |
| Depth | 20.7 kilometres (13 mi) |
| Epicenter | 52°58′N 4°23′W / 52.96°N 4.38°WCoordinates: 52°58′N 4°23′W / 52.96°N 4.38°W |
| Areas affected |
United Kingdom Ireland |
| Max. intensity | VI (Slightly damaging) |
The 1984 Llŷn Peninsula earthquake struck the Llŷn Peninsula in Gwynedd, north-west Wales on Thursday 19 July 1984 at 06:56 UTC (07:56 BST). It measured 5.4 on the Richter scale, and is the largest known onshore earthquake to occur in the UK since instrumental measurements began.
The effects were felt throughout Wales, most of England and parts of Ireland and Scotland. There were many reports of minor damage to chimneys and masonry throughout Wales and England, the biggest concentration of damage being in Liverpool, which is located around 65 miles north-east of the epicentre. Minor injuries were also reported in the areas surrounding the epicentral area, and rockslides occurred at Tremadog in Gwynedd.
It was followed by many aftershocks in the following months, the largest measuring 4.3 on the Richter scale, which itself was felt as far away as Dublin, in Ireland.
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