posted by Surfurrus at 10:47 AM on October 16, 2006
Around 120,000 years ago, says Fryer, the coastal shelf collapsed into the ocean, creating a cataclysmic megatsunami that washed over the Hawaiian Islands, penetrating up to four miles inland and a third of a mile high.
In the intervening millennia, says the University of Hawaii geophysicist, the coastline has built back up and is ripe for a repeat.
That doesn't mean it will happen tomorrow, or next year, or even next century.
"Those things happen few and far between, but we cannot ignore them because when they do happen they are so catastrophic that they are sort of culture-ending disasters," says Fryer. "I am pretty much convinced that if there would be a big landslide like that, there would be abundant warning. There would be lots of little earthquakes, and it should be pretty well defined. I think there would be months or even years of warning. But it would still be a catastrophe."
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posted by caddis at 9:33 AM on October 16, 2006