Tree-ring study enables researchers to link massive American earthquake to Japanese tsunami in January 1700
University of WashingtonStumps of cedar trees are revealing details of a huge earthquake along North America's west coast more than 100 years before the arrival of the first European occupants. University of Washington researchers are reporting in Nature that evidence in the dead wood confirms that a great earthquake struck the Pacific Northwest coast in 1700 and set off a tsunami, a train of massive ocean waves, that flooded coastal Japan.