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Tongariro

A vulcanian explosion from Ngauruhoe volcano in New Zealand on February 19, 1975, ejects a dark, ash-laden cloud. Large, meter-scale ejected blocks trailing streamers of ash can be seen in the eruption column. Blocks up to 20 m across were projected hundreds of meters above the vent.

Photo by Ian Nairn, 1975 (New Zealand Geological Survey).

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