Mt. Merapi (IMAGE) Penn State Caption This is a lethal pyroclastic flow and surge in progress at Mt. Merapi, Indonesia. Credit M. Mongin, Penn State Usage Restrictions non advertising use only 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.