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Posts Tagged ‘faultline’

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…

Ancient faults still prove to be powerful

August 26, 2011 Comments off

physorg.com

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“Our discussion was interrupted,” Department Chair Chuck Bailey said, “by a motion from the floor.”

All joking aside, even the experts didn’t realize what was going on at first.

“We thought it was construction,” Chancellor Professor of Geology Heather Macdonald said.

However, when the tremor continued for nearly 20 seconds the geologists realized they had a quake on their hands – a major quake. A 5.8 on the Richter scale is significant for the region.

According to reports, the occurred at 1:51 p.m. and was centered in Mineral, Va., which is about half way between Richmond and Charlottesville. Tremors were felt as far north as Maine.

Bailey, a structural geologist who teaches courses on Virginia geology, is particularly familiar with the area’s seismic activity. Following Tuesday’s event, his expertise was sought out by national and local media.

“This is a once-in-a-century earthquake, anyway you slice it”, Bailey told the Associated Press, adding that quakes of a similar Read more…

Christchurch torn by entirely new fault

February 25, 2011 Comments off

A new threat of landslides has emerged near to the epicentre of the quake, where boulders loosened by the tremor have already killed two and crushed homes. An aerial survey by scientists found no surface trace of the fault, which is centred southeast of Christchurch. But the expedition found worrying evidence of slips on the crest of the Port Hills, and above Lyttelton, Rapaki and Sumner. Geologists would place monitoring stakes in the hills to measure whether the landslides were creeping towards populated areas.

Early investigations have suggested that the shallow earthquake was an aftershock of the September quake in Darfield, but did not come from the same faultline. GNS Science natural hazards platform manager Kelvin Barryman said tests indicated it occurred on a “blind” or unknown Read more…