Scientist holding dead tree stump

Research Geologist Peter Haeussler holding a stump from a tree that was killed in the penultimate great earthquake - the last giant earthquake before the 1964 M9.2 earthquake in southcentral Alaska. The sample was collected at a tidal marsh near Girdwood, Alaska, for dendrochronology, that is tree ring, studies, which indicate this previous giant earthquake was about 850 years ago.