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Scientist holding dead tree stump

Detailed Description

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. 


Public Domain.

Photo by Rob Witter, U.S. Geological Survey