Supervolcano

1943

1958, Glasgow, Strathclyde, Scotland, UK

1959, Innisfail, Alberta, Canada

13 January 1974, Terrace, British Columbia, Canada

20 January 1983, Toronto, Ontario, Canada

17 February 1952, Southampton, England, UK

22 July 1960, Vancouver, British Columbia, Canada

4 February 1962, London, Ontario, Canada

9 September 1958, Edmonton, Alberta, Canada

14 March 1955, Truro, Nova Scotia, Canada

8 December 1955, Penticton, British Columbia, Canada

1949, Columbus, Ohio, USA

25 May 1957, Middlesbrough, Teeside, England, UK

31 March 1974, Wrexham, North Wales, UK