Earth Science News  





.
SHAKE AND BLOW
Liquefaction major culprit in Japan quake

Some degree of soil liquefaction, in which saturated soils, particularly sand, gravel or fill, can lose much of their strength and flow during an earthquake, is common in most incidents, an OSU release said.
by Staff Writers
Corvallis, Ore. (UPI) Apr 18, 2011
U.S. seismologists studying the earthquake and tsunami disaster in Japan say the temblor caused significant soil "liquefaction" responsible for much damage.

The broad geographic extent of the liquefaction over hundreds of miles was surprising to experienced engineers accustomed to seeing earthquake disaster sites, including the recent events in Chile and New Zealand.

"We've seen localized examples of soil liquefaction as extreme as this before, but the distance and extent of damage in Japan were unusually severe," said Scott Ashford, a professor of geotechnical engineering at Oregon State University and a member of the research team.

"Entire structures were tilted and sinking into the sediments, even while they remained intact," Ashford said. "The shifts in soil destroyed water, sewer and gas pipelines, crippling the utilities and infrastructure these communities need to function. We saw some places that sank as much as 4 feet."

Some degree of soil liquefaction, in which saturated soils, particularly sand, gravel or fill, can lose much of their strength and flow during an earthquake, is common in most incidents, an OSU release said.

However, the length of the Japanese earthquake -- almost 5 minutes -- may require a reconsideration of the extent of liquefaction damage possible in similar situations, researchers said.

"With such a long-lasting earthquake, we saw how structures that might have been OK after 30 seconds just continued to sink and tilt as the shaking continued for several more minutes," Ashford said.




Share This Article With Planet Earth
del.icio.usdel.icio.us DiggDigg RedditReddit
YahooMyWebYahooMyWeb GoogleGoogle FacebookFacebook



Related Links
Bringing Order To A World Of Disasters
When the Earth Quakes
A world of storm and tempest



Tempur-Pedic Mattress Comparison

Newsletters :: SpaceDaily Express :: SpaceWar Express :: TerraDaily Express :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News
SHAKE AND BLOW
6.6-magnitude quake hits off New Zealand: USGS
Wellington (AFP) April 19, 2011
A strong 6.6-magnitude undersea earthquake hit off the northeast coast of New Zealand on Tuesday, the US Geological Survey said. The Pacific Tsunami Warning Center issued a local tsunami warning but said there was no threat of a widespread destructive tsunami. The quake struck at 1:03 am (1303 Monday GMT) around 550 kilometres (350 miles) east of Auckland, USGS said, with an epicentre 90 ... read more

.
Get Our Free Newsletters Via Email
  


SHAKE AND BLOW
Taiwan fears impact of Japan-style disaster

Latvia's president marked by role at Chernobyl

Leaders pledge aid to complete Chernobyl shelter

Nuclear workers patrol Chernobyl's ruined reactor

SHAKE AND BLOW
Don't stigmatise nuclear evacuees, says Japan govt

Robot readings in Japan nuke plant 'harsh'

Technology addiction takes toll in Asia

Researchers Discover The Cause Of Irradiation-Induced Instability In Materials Surfaces

SHAKE AND BLOW
Oxygenation At A Depth Of 120 Meters Can Save The Baltic Sea

How Do You Manage U.S. Oceans? Look At Local Successes

New count made of world's barrier islands

Mekong nations at odds on controversial Laos dam

SHAKE AND BLOW
Arctic coastline eroding with warming

Arctic Coasts On The Retreat

West Antarctic Warming Triggered By Warmer Sea Surface In Tropical Pacific

Arctic Sea Ice Flights Near Completion

SHAKE AND BLOW
Nationwide Study Finds US Meat And Poultry Is Widely Contaminated

Activists save Chinese dogs from cooking pot

Japan asks Brazil to ease food import rules

New Citrus Variety Released By Uc Riverside Is Very Sweet, Juicy And Low-Seeded

SHAKE AND BLOW
Floods force hundreds to evacuate in central Canada

Liquefaction major culprit in Japan quake

6.6-magnitude quake hits off New Zealand: USGS

Increasing activity at Philippine volcano

SHAKE AND BLOW
Work on Sudan split continues

Chinese aid good for Africa: ministers

Military helicopter crashes in Darfur, five dead: army

Senegal opens Chinese-built theatre

SHAKE AND BLOW
Missing The Gorilla

Human Rules May Determine Environmental Tipping Points

World's oldest man turns 114 in Japan

Scripps Research Scientists Identify Mechanism Of Long-Term Memory


The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement