Rock Avalanche (IMAGE) University of Zurich Caption The major rock avalanche in the Bregaglia after Christmas 2011 could be a result of temperature rise in permafrost areas. Credit Heli Bernina 2011 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.