Jessica DePaolis (IMAGE) Virginia Tech Caption Jessica DePaolis (second from left) and the team of researchers studied and compared sedimentary core samples in Montague Island, Alaska, and found evidence that four of the past eight earthquakes there included a secondary slip from the splay fault attached to the subduction zone, which precipitated an additional tsunami. Photo courtesy of Peter Haeussler. Credit Photo courtesy of Peter Haeussler. Usage Restrictions Photo courtesy of Peter Haeussler. License Original 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.