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A research team from the University of Arizona compared tree rings, with their data pinpointing that the two earthquakes happened back to back in either late A.D. 923 or early 924.
Learning From The Past About The Possible Future: Tree Rings Reveal Quake Threat To Pacific Northwest
Washington State’s Puget Sound could face previously unknown earthquake risks, according to a new study that has pinned down the date of an ancient earthquake using tree rings and the radiation left by a mysterious cosmic force
Analysis of tree rings shows that two faults near Seattle, Washington ruptured at the same time or soon after each other more than 1000 years ago – a repeat today would cause a major disaster in the region
A research team from the University of Arizona compared tree rings, with their data pinpointing that the two earthquakes happened back to back in either late A.D. 923 or early 924.