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1984 Llŷn Peninsula earthquake

From Wikipedia, the free encyclopedia

1984 Llŷn Peninsula earthquake
UTC time1984-07-19 06:56:10
ISC event549253
Local date19 July 1984 (1984-07-19)
Local time07:56 BST
Magnitude5.4 ML
Depth20.7 kilometres (13 mi)
Epicentre52°58′N 4°23′W / 52.96°N 4.38°W / 52.96; -4.38
Areas affectedUnited Kingdom
Max. intensityVI (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.[1][2]

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.[2] Minor injuries were also reported in the areas surrounding the epicentral area, and rockslides occurred at Tremadog in Gwynedd.[3]

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.[4]


  1. ^ "BGS FAQ What are the largest two instrumental, onshore earthquakes?". BGS. Archived from the original on 9 October 2007. Retrieved 10 October 2007.
  2. ^ a b "19 July 1984 Lleyn Peninsula". BGS. Archived from the original on 9 June 2007. Retrieved 10 October 2007.
  3. ^ "USGS Significant earthquakes of the world 1984". USGS. Archived from the original on 12 October 2007. Retrieved 10 October 2007.
  4. ^ "Manchester Earthquake Sequence report (Mentions this event)". BGS. Archived from the original on 6 August 2007. Retrieved 10 October 2007.

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This page was last edited on 27 December 2020, at 22:24
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