The 1984 Llŷn Peninsula earthquake struck the Llŷn Peninsula in

Gwynedd Gwynedd (; ) is a county and preserved county (latter with differing boundaries; includes the Isle of Anglesey) in the north-west of Wales. It shares borders with Powys, Conwy County Borough, Denbighshire, Anglesey over the Menai Strait, and C ...

, 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 Tremadog (formerly Tremadoc) is a village in the community of Porthmadog, in Gwynedd, north west Wales; about north of Porthmadog town-centre. It was a planned settlement, founded by William Madocks, who bought the land in 1798. The centre of ...

in Gwynedd. The 19 July earthquake was followed by many

aftershock In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousand ...

s 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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Lleyn Penin, NW Wales
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British Geological Survey The British Geological Survey (BGS) is a partly publicly funded body which aims to advance geoscientific knowledge of the United Kingdom landmass and its continental shelf by means of systematic surveying, monitoring and research. The BGS h ...

{{DEFAULTSORT:1984 Llyn Peninsula Earthquake 1984 Llŷn Llyn Llyn Peninsula earthquake History of Gwynedd Natural disasters in Wales Environment of Gwynedd July 1984 events in the United Kingdom Geology of Gwynedd

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