Avulsion (IMAGE) California Institute of Technology Caption Satellite view of a river avulsion, whereby the river abruptly and catastrophically changed its course to the ocean. This delta is found in East Aceh, Sumatra. Credit Base image courtesy of Sentinel 2, Vamsi Ganti, and Sam Brooke. Usage Restrictions For use in news stories 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.