Mount Pinatubo Eruption (IMAGE) Rutgers University Caption Mount Pinatubo in the Philippines erupting on June 12, 1991. A much larger eruption occurred three days later. Credit U.S. Geological Survey 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.