A landslide last fall caused a giant wave not seen in Alaska since a storied 1958 event in Lituya Bay. After a period of heavy rains, a mountainside near Tyndall Glacier collapsed into a fiord of Icy Bay on Oct. 17, 2015. The displaced water generated a wave that sheared alders more than 500 feet up on a hillside across from the slide at the Southeast Alaska location. To put that in perspective, the 2011 tsunami in Japan reached about 130 feet above sea level. The Icy Bay wave may be the largest since a magnitude-8 earthquake shook much of...