Mount Pinatubo, on the Philippine island of Luzon, explodes June 15, 1991, sending more than a cubic mile of volcanic material some 22 miles into the air, while pyroclastic flows bury nearby ...

Experts predict that every town in a 50-mile (80km) radius would be all but annihilated by the same pyroclastic flows ... in the smaller eruptions of Mount Pinatubo in 1991 and Krakatoa in 1883 ...

This is Mount Pinatubo, an active stratovolcano ... to-air missile installations that have since been buried by pyroclastic flows and subsequent lahar. The off-road drive along the O'Donnell ...