1984 Llŷn Peninsula earthquake

1984 Llŷn Peninsula earthquake
1984 Llŷn Peninsula earthquake is located in Gwynedd
1984 Llŷn Peninsula earthquake
1984 Llŷn Peninsula earthquake is located in the United Kingdom
1984 Llŷn Peninsula earthquake
UTC time1984-07-19 06:56:10
ISC event549253
USGS-ANSSComCat
Local date19 July 1984 (1984-07-19)
Local time07:56 (UTC +1)
Magnitude5.4 ML
Depth20.7 kilometres (13 mi)
Epicentre52°58′N 4°23′W / 52.96°N 4.38°W / 52.96; -4.38Coordinates: 52°58′N 4°23′W / 52.96°N 4.38°W / 52.96; -4.38
Areas affectedUnited Kingdom
Ireland
Max. intensityVI (Strong)

EMS-98 VI (Slightly damaging)

The 1984 Llŷn Peninsula earthquake struck the Llŷn Peninsula in Gwynedd, northwest Wales on Thursday 19 July 1984 at 06:56 UTC (07:56 BST). Measuring 5.4 on the Richter scale, it is the largest 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 northeast of the epicentre. Minor injuries were also reported in the areas surrounding the epicentral area, and rockslides occurred at Tremadog in Gwynedd.

The 19 July earthquake 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.


This page was last updated at 2022-05-30 23:03 UTC. Update now. View original page.

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