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Posts Tagged ‘Japan Trench’

Threatening, active faults found off Boso

March 27, 2012 Comments off

japantimes

Dual jolt could trigger Tokyo temblor up to magnitude 9

Kyodo

Credit-Wikipedia

Two previously unknown active faults were found off the Boso Peninsula in Chiba Prefecture, with one researcher warning that a jolt in the two faults at the same time could trigger an earthquake of magnitude 8 to 9.

The two faults, one at least 160 km long and the other more than 300 km, were found on the floor of the Pacific Ocean around 100 to 200 km southeast of the southern tip of the peninsula, according to a group of researchers from Hiroshima University, Nagoya University, the Japan Agency for Marine-Earth Science and Technology and other parties.

“The faults have been unmarked and uninvestigated. There is a possibility of strong jolts and tsunami reaching the southern Kanto region (including Tokyo) and the Tokai region (central Honshu). It should be promptly investigated in detail,” said research group member Mitsuhisa Watanabe, a professor at Toyo University.

The group will report its findings at a Thursday meeting of the Association of Japanese Geographers in Tokyo.

The group used a bathymetric chart made by the Japan Coast Guard to analyze the geography of the seafloor in detail. It then estimated the location of the active faults by taking into consideration cliffs formed by earthquakes and other elevated features.

According to Watanabe, the two faults were Read more…

Strain from Japan earthquake may lead to more seismic trouble, scientists say

April 11, 2011 Comments off

washingtonpost

Japan won’t stop shaking. One month after the March 11 earthquake and tsunami, the nation rode out yet another powerful aftershock Monday, the second in four days. This one rattled buildings in Tokyo and briefly cut power to the damaged nuclear plant in Fukushima.

 

With soldiers still looking for the bodies of thousands of people who vanished in the killer wave a month ago, Japan is coping with the painful reality that it sits in a seismic bull’s-eye.

A new calculation by American and Japanese scientists has concluded that the March 11 event may have heightened the stress on faults bracketing the ruptured segment of the Japan Trench.

“There’s quite a bit of real estate on which stress has increased, by our calculations,” said U.S. Geological Survey geophysicist Ross Stein. “The possibility of getting large, Read more…