Most Alaska communities vulnerable to local tsunamis have tsunami siren systems that can be activated by local emergency officials to warn residents to head for high ground. The center within minutes of a quake can put out alerts to warn West Coast and Hawaii communities that a big wave is headed their way. The 1964 quake and the tsunamis played a role in the formation of the West Coast and Alaska Tsunami Warning Center, renamed the National Tsunami Warning Center, operated by the National Oceanic and Atmospheric Administration. Geological Survey, the Government Hill Elementary School is shown destroyed by a landslide following an earthquake in Anchorage, Alaska. In this March 1964 photo released by the U.S. The "avalanche of sediment" created the wave that struck Chenega. The huge delta of unstable sediment descended down a steep escarpment into the third basin in a giant underwater landslide, Brothers said. "The intermediate basin filled up with sediment, setting the stage for this instability, and the trigger that occurred when this earthquake struck," Brothers said. As glaciers retreated, sediment from rivers filled the underwater basins with unstable sediment washed from land. The basins are bound by steep sides and were carved by glaciers when sea level was lower.īrothers said Monday the basins are like a series of bowls setting on shelves at different heights. The study found three basins covering 10 to 15 miles along Dangerous Passage, a fjord.
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