Mount Pinatubo (IMAGE) U.S. National Science Foundation Caption This photo shows an 18-kilometer-high plume from one of a series of eruptions in 1991 at Mount Pinatubo. Credit USGS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.