Synopsis
The second-largest volcanic eruption of the 20th century, and by far the largest eruption to affect a densely populated area, occurred at Mount Pinatubo in the Philippines on June 15, 1991. The eruption produced high-speed avalanches of hot ash and gas, giant mudflows, and a cloud of volcanic ash hundreds of miles across. This animation shows the ozone measurements around Mt Pinatubo reacting to the eruption. That "hole" in the days immediately following the eruption of Pinatubo is due to…
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