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Old Japanese Tsunami Data Points To Massive Quakes In North America
"The online version includes a downloadable animation, prepared by Satake, which shows hourly snapshots of the simulated tsunami sloshing across the Pacific Ocean for a full day.
Reston - Nov 25, 2003
"Guided by Japanese writings from an era of shoguns, an international team of scientists today reported new evidence that an earthquake of magnitude 9 struck the northwestern United States and southwestern Canada three centuries ago. The findings are likely to affect the region's precautions against future earthquakes and tsunamis.
Writing this week in the American Geophysical Union's Journal of Geophysical Research, scientists from Japan, Canada and the United States summarize old reports of flooding and damage by a tsunami in 1700 on the Pacific coast of Japan.
With the aid of computer simulations, they conclude this tsunami required a North American earthquake close to magnitude 9. Such an earthquake, in a few minutes, would release about as much energy as the United States now consumes in a month.
The report's authors are Kenji Satake, of the Geological Survey of Japan; Kelin Wang, of the Geological Survey of Canada; and Brian Atwater, of the United States Geological Survey based at the University of Washington in Seattle.
The earthquake apparently ruptured the full length of an enormous fault, the Cascadia subduction zone, which extends more than 600 miles along the Pacific coast from southern British Columbia to northern California."
