1960 Valdivia earthquake
The 1960 Valdivia earthquake () or Great Chilean earthquake ("Gran terremoto de Chile") of 22 May is the most powerful earthquake ever recorded. Various studies have placed it at 9.4–9.6 on the moment magnitude scale. It occurred in the afternoon (19:11 GMT, 15:11 local time), and lasted approximately 10 minutes. The resulting tsunami affected southern Chile, Hawaii, Japan, the Philippines, eastern New Zealand, southeast Australia and the Aleutian Islands.
1984 Llŷn Peninsula earthquake
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 onshore earthquake to occur in the UK since instrumental measurements began.