Toba Caldera (image) University of Bristol Share Print E-Mail Caption The Toba caldera was the site of a massive super-eruption 75,000 years ago. Credit NASA/METI/AIST/Japan Space Systems, and U.S./Japan ASTER Science Team. Usage Restrictions None Share Print E-Mail 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.