Earth Science News  





.
TECTONICS
Japan quake upgraded to 9.0 magnitude

Scientists describe 'fossil seismograph'
Tel Aviv, Israel (UPI) Mar 14, 2011 - Scientists at Tel Aviv University in Israel say they've developed a "fossil seismograph" that can uncover signs of ancient seismic activity. Professor Shmuel Marco of the Department of Geophysics says he was inspired by a strange "wave" phenomenon he found in disturbed sediment in the Dead Sea region, a TAU release reported Monday. The new research method, developed with input from geologists and physicists, is relevant to areas where earthquakes affect bodies of water, such as the West Coast of the United States or the current situation in Japan, Marco said.

"Current seismographical data on earthquakes only reaches back a century or so," Marco said. "Our new approach investigates wave patterns of heavy sediment that penetrates into the light sediments that lie directly on top of them. "This helps us to understand the intensity of earthquakes in bygone eras -- it's a yardstick for measuring the impact factor of earthquakes from the past." The researchers considered the geometry of the deformation they found in the Dead Sea sediment and combined it with a number of other parameters found in physical science to calculate how earthquakes from the past were distributed in scale, time and place. "We've expanded the window of observation beyond 100 years, to create, if you will, a 'fossil seismograph,'" Marco said. The researchers say the ability to learn from earthquakes of the ancient past could help better predict earthquakes of the future.
by Staff Writers
Washington (AFP) March 14, 2011
US experts on Monday upgraded the strength of the earthquake which rocked Japan last week from a magnitude of 8.9 to 9.0, making it the fourth largest in the world since 1900.

The US Geological Survey (USGS) said Japanese seismologists have also independently updated their estimate of the earthquake which struck northern Japan on Friday unleashing a devastating tsunami.

"The USGS often updates an earthquake's magnitude following the event," the US-based center said in a statement. "Updates occur as more data become available and more time-intensive analysis is performed."

It added that Friday's quake was also the strongest ever recorded in Japan since modern readings began 130 years ago.

The largest earthquake ever recorded was in Chile on May 5, 1960 when a 9.5 temblor struck off the southern coast, the USGS said. More than 1,600 people were killed and two million left homeless.

On March 27, 1964 a quake and tsunami killed 128 people and caused severe damage to Anchorage the largest city in Alaska.

And then on December 26, 2004, came the undersea quake off Indonesia, which caused a massive tsunami that devastated coastlines in countries around the Indian Ocean, killing more than 220,000 people.

A 9.0-magnitude quake also hit off the coast of the remote Kamchatka peninsula in Russia's far east on November 4, 1952, causing Pacific-wide tsunamis.

The USGS said on its website that quake magnitudes are often revised once its experts have received all the seismology reports from around the world and the estimates from other national and international agencies.

"Some methods give approximate values within minutes of the earthquake, and others require more complete data sets and extensive analysis," it added.

Japan has been left reeling by Friday's natural catastrophe, with more than 10,000 feared dead, whole villages devastated, at least 1.4 million people left without running water and more than 500,000 crammed into shelters.

The Asian nation is also facing a nuclear emergency after the quake and tsunami crippled the ageing Fukushima plant, located 250 kilometers (160 miles) northeast of Tokyo, knocking out the cooling systems.

Two explosions have rocked the complex and the Japanese government said part of the container of one of the reactors appeared to be damaged, indicating possible serious radiation leaks.




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



Related Links
Tectonic Science and News



Tempur-Pedic Mattress Comparison

Newsletters :: SpaceDaily Express :: SpaceWar Express :: TerraDaily Express :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News
TECTONICS
Japan quake shifted Earth on its axis
Pasadena, Calif. (UPI) Mar 14, 2011
The magnitude-9.0 earthquake that struck Japan shifted the Earth on its axis and shortened the length of a day by a hair, U.S. scientists said. It also moved Japan's coastline, the U.S. Geological Survey said. The redistribution of mass caused by the quake tilted the Earth's axis 6.5 inches and shortened the day by a 1.8 millionths of a second, the NASA Jet Propulsion Laboratory ... read more

.
Get Our Free Newsletters Via Email
  


TECTONICS
Outside View: Disaster's consequences

Japan struggles with enormous relief effort

In tragedy, Japan impresses the world

Almost 600,000 evacuated in Japan after quake: UN

TECTONICS
Apple delays iPad 2 release in Japan

Online sites top newspapers for Americans: report

Made-for-Internet movie debuts on YouTube

Mideast unrest pushing up gem prices, say traders

TECTONICS
'Pancake' stingrays found in Amazon

Sinohydro inks $2 bn deal to build Iran dam: report

Shallow-Water Shrimp Tolerates Deep-Sea Conditions

Weed-Eating Fish Key To Reef Survival

TECTONICS
Arctic-Wide Measurements Verify Rapid Ozone Depletion In Recent Days

Wheels Up for Extensive Survey of Arctic Ice

Pace of polar ice melt 'accelerating rapidly': study

Soot Packs A Punch On Tibetan Plateau's Climate

TECTONICS
Untapped Crop Data From Africa Predicts Corn Peril If Temperatures Rise

Knee-high fence to halt rampaging Australian toads

Seedlings Thrive With Distant Relatives, Seeds With Close Family

Seedless Cherimoya, The Next Banana

TECTONICS
US host Beck blasted for Japan quake comments

Tsunami survivor recounts nursing home 'nightmare'

EU clears aid for flood-ravaged eastern Europe

Japan volcano again sends columns of ash in air

TECTONICS
Cameroon suspends Twitter for 'security reasons'

Over 500 flee restive Casamance flee to Gambia: UN

First protests in Guinea since Conde takes power

China lends Angola $15 bn but creates few jobs

TECTONICS
Abortions give rise to Asia's 'lost boy' generation

Age Affects All Primates

Brain Has 3 Layers Of Working Memory

Missing DNA Helps Make Us Human


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