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Tsunami Hits Japan After Massive 8.9 Earthquak
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Credit: NHK via AP View full size image
Video of tsunami striking Kamaishi, Japan, March 11, 2011.
by Jeanna Bryner , Live Science Managing Editor | March 11, 2011 04:54am ET
Update 5:00 p.m. ES
Much of the harbor iCrescent City,California, has beendestroyed, and one
person is feared deadaccording to the LosAngeles Times. InChile, officials haveupgraded a tsunamiwarning to an alert aordered coastal
residents to evacuateCNN Chile reported
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Update 3:05 p.m. EST:
The U.S. National Oceanic and Atmospheric Administration released a video showing how the tsunami haspread. Crescent City, California, has been hit hard, with reports of waves up to 6 feet (1.8 meters) tall.
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Credit: US GS
View full size image
The epicenter of
the March 11
earthquake occurred near the
east coast of Honshu, Japan.
waves are rolling in every 15 minutes. No major damage has been reported in the two hours since the firstwaves hit.
Below is our original news story, which remains as originally posted:
Editor's Note: This story was updated at 9:25 a.m. EST.
An 8.9-magnitude earthquake struck northern Japan today (March 11), triggering tsunamis across the areathat reportedly swept cars, buildings and other debris well inland.
The epicenter of the earthquake was 231 miles (373 kilometers) northeast of Tokyo and 80 miles (130 km)east of Sendai, Honshu, according to the U.S. Geological Survey.
A tsunami is a series of waves where the first one may not be the largest; wave heights can't be predicted acan change as the water hits the coast, according to the USGS.
The March 11 earthquake was preceded by a series of large foreshocks over the last two days — the first owhich was a 7.2-magnitude quake on March 9 about 25 miles (40 km) from the March 11 earthquake.Today's temblor occurred as a result of thrust-faulting on or near the subduction zone, where Earth's Pacifi
plate thrusts underneath Japan at the Japan Trench.
The Japan Meteorological Society has forecast more major tsunamis in the area, with some expected to reamore than 30 feet (10 m) off the coast of Hokkaido, Japan's second largest island. A tsunami was alsogenerated off the coast of Hawaii, one that could cause damage along the coastlines of all islands in the staof Hawaii, according to the Pacific Tsunami Warning Center. Tsunami warnings are in effect across Hawaas well.
A Tsunami Warning is also in effect for:
Coastal areas of California and Oregon from Point Concepcion, Calif., to the Oregon-Washington border.Coastal areas of Alaska from Amchitka Pass, Alaska (125 miles west of Adak) to Attu, Alaska.
(A Tsunami Warning is the highest tsunami alert and means a tsunami is imminent. All coastal residents inthe warning area who are near the beach or in low-lying regions should move immediately inland to higherground and away from all harbors and inlets including those sheltered directly from the sea.)
A Tsunami Advisory is in effect for:
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Coastal areas of California from the California-Mexico border to Point Concepcion, Calif.Coastal areas of Washington, British Columbia and Alaska from the Oregon-Washington border toAmchitka Pass, Alaska.
(A Tsunami Advisory is the third highest tsunami alert and means that a tsunami capable of producing strocurrents or waves dangerous to people near water is expected.)
As for why some earthquakes trigger tsunamis and others don't, scientists say several factors come into pla
including the strength of the quake (below 7.5- or 7.0-magnitude quakes don't typically cause tsnamis), thedirection of the temblor's motion and the topography of the seafloor, according to the USGS.
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Jeanna Bryner
Before becoming managing editor, Jeanna served as a reporter for Live Science and SPACE.com for aboutthree years. Previously she was an assistant editor at Scholastic's Science World magazine. Jeanna has anEnglish degree from Salisbury University, a Master's degree in biogeochemistry and environmental sciencfrom the University of Maryland, and a science journalism degree from New York University.Jeanna Bryner on
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