“Ash clouds rise above a pyroclastic flow traveling down the Buang valley on the upper NW
“Ash clouds rise above a pyroclastic flow traveling down the Buang valley on the upper NW flank of Mayon volcano in the Philippines on September 12, 1984. The toe of the advancing pyroclastic flow is visible at the lower right. These pyroclastic flows traveled down to 100 m elevation at rates of about 20 m/sec.” Photo by Olimpio Pena. -- source link
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