Mount Pinatubo (IMAGE) Carnegie Institution for Science Caption This is ash from the 1991 eruption of Mount Pinatubo in the Philippines. Credit Courtesy of Jackson K./USGS Usage Restrictions With credit 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.