USGS/Cascades Volcano Observatory, Vancouver, Washington Mount Pinatubo, Philippines Background and Information DESCRIPTION: Pinatubo Volcano -- Geographic Setting, Geologic and Eruptive History -- includes 1991 eruption Maps, Graphics, and Images Map : Major Volcanoes of the Philippines -- includes Pinatubo CVO Photo Archives - Pinatubo Items of Interest 1991 Eruption - Pinatubo Volcano 1991 ...

In early 1991, Mt. Pinatubo, a volcano north of Manila on the Philippine island of Luzon, had been dormant for more than 500 years. Few geologists would have guessed that it would produce one of the worlds most explosive eruptions in the twentieth century. Indications of unrest started a few months before the June 1991 eruption, but the size and impact of the eruption were completely unexpected.

A two-page color fact sheet about the cataclysmic eruption of Mount Pinatubo, Philippines that occured in 1991.