Simulation of the Volcanic Ash (IMAGE) Helmholtz Association Caption This is a simulation of the volcanic ash concentration between a height of approx. 2,000 and 7,000 meters on April 17, 2010 (right). On the left, by way of comparison, is the spread forecast by the VAAC (red line). Credit GKSS Research Centre Geesthacht 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.