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The second-largest volcanic eruption of the 20th century occurred at Mount Pinatubo in the Philippines on June 15, 1991. By far the largest eruption in the past 100 years to affect a densely populated area, Pinatubo produced high-speed avalanches of pyroclastic flows and a cloud of volcanic ash hundreds of miles across. Meanwhile, Typhoon Yunya brought cascading hazards such as flooding and fast-moving lahars when it arrived within 75 km of the volcano during the eruption’s peak activity.
Source: appliedscience...