Pyroclastic flows traveling down the flanks of Ngauruhoe volcano on 19 February 1975 as an ash plume rises above the summit crater. The eruption column rose 12 km above the vent and ash fell 160 km away in Hamilton City. Explosive activity had begun on the 12th and continued until the 23rd. Photo by Graham Hancocks, 1975 (New Zealand Geological Survey).
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