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Pinatubo Volcano, Philippines
The climactic eruptions on June 15, 1991, created a 2.5-km-wide caldera at the summit of Pinatubo volcano.
The elevation of the caldera floor is more than 900 m below that of the pre-eruption summit of Pinatubo.
Steam rises from fumaroles on the caldera floor in this October 4, 1991, view from the north.
The outer flanks of the caldera are stripped of vegetation and covered with deposits of airfall ash and pyroclastic surges.
PHOTO SOURCE: Chris Newhall 1991, US Geological Survey, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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