Supervolcano

25 May 1957, Middlesbrough, Teeside, England, UK

17 February 1952, Southampton, England, UK

14 March 1955, Truro, Nova Scotia, Canada

13 January 1974, Terrace, British Columbia, Canada

1943

22 July 1960, Vancouver, British Columbia, Canada

1958, Glasgow, Strathclyde, Scotland, UK

20 January 1983, Toronto, Ontario, Canada