Quake moved Japan by 8 feet: USGS
Washington, Mar 13: Japan’s recent massive earthquake, one of the largest ever recorded, appears to have moved the island by about eight feet, the US Geological Survey has said.
“That’s a reasonable number,” USGS seismologist Paul Earle told AFP. “Eight feet, that’s certainly going to be in the ballpark.”
Friday’s 8.9 magnitude quake unleashed a terrifying tsunami that engulfed towns and cities on Japan’s northeastern coast, destroying everything in its path in what Prime Minister Naoto Kan said was an “unprecedented national disaster.”
The quake and its tectonic shift resulted from “thrust faulting” along the boundary of the Pacific and North America plates, according to the USGS.
The Pacific plate pushes under a far western wedge of the North America plate at the rate of about 3.3 inches per year, but a colossal earthquake can provide enough of a jolt to dramatically move the plates, with catastrophic consequences.
“With an earthquake this large, you can get these huge ground shifts,” Earle said. “On the actual fault you can get 65 feet of relative movement, on the two sides of the fault.”
He said similar movements would have been seen for Chile and Indonesia.
In December 2004, a 9.1 magnitude quake off Sumatra caused a tsunami that killed an estimated 228,000 people. An 8.8 quake off the coast of Chile in February 2010 killed more than 500.
There was not a similar ground shift in the 7.0 earthquake that devastated Haiti in February 2010, Earle said.
“A magnitude 7.0 is much smaller than the earthquake that just happened in Japan,” he said. “We’ve had aftershocks (in Japan) larger than the Haiti earthquake.” (AFP)
Lastupdate on : Sun, 13 Mar 2011 21:30:00 Makkah time
Lastupdate on : Sun, 13 Mar 2011 18:30:00 GMT
Lastupdate on : Mon, 14 Mar 2011 00:00:00 IST
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