Mayon Volcano could be gearing up for explosive activity
Detailed Description
Pyroclastic flows descend the south eastern flank of Mayon Volcano, Philippines, during its 1984 eruption. There were no casualties from that eruption because more than 73,000 people evacuated the danger zones, as recommended by scientists of the Philippine Institute of Volcanology and Seismology (U.S. Geological Survey photo).