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
Tectonic Science and News
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
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
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
'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
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
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
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
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
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|