![]() ![]() Archaeological research in the region has uncovered evidence of several coastal villages having been flooded and abandoned around 1700. ![]() Core samples from the ocean floor, as well as debris samples from some earthquake-induced landslides in the Pacific Northwest, also support this timing of the event. Sediment layers in these locations demonstrate a pattern consistent with seismic and tsunami events around this time. This includes both inland stands of trees, such as one on the Copalis River in Washington, and pockets of tree stumps that are now under the ocean surface and become exposed only at low tide. The most important clue linking the tsunami in Japan and the earthquake in the Pacific Northwest comes from studies of tree rings ( dendrochronology), which show that several " ghost forests" of red cedar trees in Oregon and Washington, killed by lowering of coastal forests into the tidal zone by the earthquake, have outermost growth rings that formed in 1699, the last growing season before the tsunami. ![]() The Japanese records exist primarily in the modern-day Iwate Prefecture, in communities such as Tsugaruishi, Miyako (Kuwagasaki) and Ĺtsuchi. Although there are no written records for the region from the time, the timing of the earthquake has been inferred from Japanese records of a tsunami that does not correlate with any other Pacific Rim quake. The earthquake took place at about 21:00 Pacific Time on Janu( NS). ![]()
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