Supervolcano

13 January 1974, Terrace, British Columbia, Canada

1949, Columbus, Ohio, USA

14 March 1955, Truro, Nova Scotia, Canada

22 July 1960, Vancouver, British Columbia, Canada

25 May 1957, Middlesbrough, Teeside, England, UK

20 January 1983, Toronto, Ontario, Canada

31 March 1974, Wrexham, North Wales, UK

1958, Glasgow, Strathclyde, Scotland, UK

1943

9 September 1958, Edmonton, Alberta, Canada

8 December 1955, Penticton, British Columbia, Canada

17 February 1952, Southampton, England, UK

1959, Innisfail, Alberta, Canada

4 February 1962, London, Ontario, Canada