Subscribe free to our newsletters via your
. Earth Science News .

Subscribe free to our newsletters via your

Fault Movement Continues Since 2004 Asian Tsunami

by Staff Writers
Logan UT (SPX) Oct 23, 2007
Researchers say ongoing uplift following the 2004 Great Sumatra-Andaman Earthquake, which triggered massive tsunamis the day after Christmas, is caused by continuing slip on the quake fault. "Parts of the Andaman Islands subsided, or rose, by up to a yard during the earthquake," said Utah State University geophysicist Tony Lowry who, along with colleagues in Tennessee, Colorado and India, has monitored restless tectonic movements using GPS technology in the remote Indian Ocean islands, a focal point of the disaster. The findings were published October 13, 2007, in Geophysical Research Letters.

Scientists have observed dramatic post-earthquake movement following several large temblors, including the 2004 quake, though the latter boasts the largest movement recorded since GPS technology became available. GPS sites in the Andamans have recorded uplift ranging from six inches to more than a foot since the earthquake and even larger horizontal movements toward the southwest.

A hot topic of debate is what causes the movement.

In a study funded by the National Science Foundation, Lowry and associates from the University of Memphis' Center for Earthquake Research and Information, the University of Colorado and India's Society for Andaman and Nicobar Ecology collected GPS measurements at 11 sites in the Andaman Islands starting three weeks after the quake.

"Post-quake movement has generally been modeled as either deep rock flow in response to the stress change during an earthquake or as continued slip on the fault," said Lowry, assistant professor in USU's geology department. "Our research indicates that the Andaman post-earthquake movements resulted mostly from continuing silent slip on the fault, below the depth that slipped during the 2004 earthquake."

The findings have further implications for the earthquake cycle on faults, including how stress accumulates in the time between quakes, he said.

"The data we're collecting may eventually help us to better understand how and how often these sorts of really big earthquakes happen," Lowry said.

Email This Article
Comment On This Article

Related Links
Utah State University
Tectonic Science and News

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

India's lithospheric roots are studied
Hyderabad, India (UPI) Oct 22, 2007
The Indian sub-continent collided with the enormous Eurasian continent 50 million years ago with enough force to create the Himalayan Mountains.

  • Satellites Help Save Lives
  • Vietnam villagers face hunger amid floods
  • 3,000 evacuated after China landslide blocks river
  • ORNL Resilience Plan To Help Tennessee, Mississippi And South Carolina Communities Beat Disaster

  • Rise In Atmospheric CO2 Accelerates As Economy Grows, Natural Carbon Sinks Weakening
  • North Atlantic Slows On The Uptake Of CO2
  • Environment ministers to meet in Indonesia
  • Tiny Pacific islands say climate change threatens survival

  • A Roadmap For Calibration And Validation
  • Key Found To Moonlight Romance
  • GeoEye Contract With ITT Begins Phased Procurement Of The GeoEye-2 Satellite
  • ITT Sensors Aboard DigitalGlobe's WorldView-1 Satellite Capture First High-Res Images

  • Researchers Examine World's Potential To Produce Biodiesel
  • Ukraine Settles Gas Debts In Line With Agreements
  • US sanctions Against Iran Could Threaten LUKoil Project
  • Energy poses major 21st century crisis: scientists

  • After extinction fears, Botswana learns to live with AIDS
  • West Nile Virus Spread Through Nerve Cells Linked To Serious Complication
  • New Model Predicts More Virulent Microbes
  • China denies cover-up of pig disease

  • Life's Early Vision
  • Researchers Studying How Singing Bats Communicate
  • Small-scale fishing threatens sea turtles
  • Symposium Marks 30th anniversary Of Discovery Of Third Domain Of Life

  • Space Sensors Shed New Light On Air Quality
  • Pitt Professor Says Harmful Byproducts Of Fossil Fuels Could Be Higher In Urban Areas
  • Analysis: Olympics and Beijing pollution
  • Scientists Estimate Mercury Emissions From US Fires

  • Researchers Find Earliest Evidence For Modern Human Behavior In South Africa
  • Neandertals And Humans Share Key Changes To Language Gene
  • Genetic Ancestral Testing Cannot Deliver On Its Promise
  • Family trees flourish on the Internet

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2007 - 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