class="extiw" title="en:Pyroclastic_flows" href="http://en.wikipedia.org/wiki/Pyroclastic_flows">Pyroclastic flows at Mayon Volcano, Philippines, 1984.Pyroclastic flows descend the south-eastern flank of Mayon Volcano, Philippines. Maximum height of the eruption column was 15 km above sea level, and volcanic ash fell within about 50 km toward the west. There were no casualties from the 1984 eruption because more than 73,000 people evacuated the danger zones as recommended by scientists of the Philippine Institute of Volcanology and Seismology.
(Photo and text courtesy of author, C.G. Newhall, Wikimedia Commons; Photo courtesy of the US Geological Survey (USGS)
href="http://en.wikipedia.org/wiki/Mayon_Volcano">Mayon Volcano, the "perfect cone." is an active stratovolcano in the Philippines' province of Albay, the Bicol Region (Courtesy of Wikipedia)