Earth Science News  





.
SHAKE AND BLOW
'Ring of fire' volcano locations explained

disclaimer: image is for illustration purposes only
by Staff Writers
Oxford, England (UPI) Oct 14, 2010
British researchers say they've solved the mystery of why volcanoes on the Pacific "ring of fire" are confined to bands of only some tens of miles wide.

Scientists at Oxford University say most of the molten rock that comes out of the explosive volcanoes is rich in water, but paradoxically they lie in narrow regions in Earth's mantle where water-free melting of rock can take place, ScienceDaily.com reported Thursday.

"It has been recognized for almost 50 years that the volcanic arcs form where one oceanic plate sinks beneath another," Professor Philip England of Oxford University's Department of Earth Sciences said, "but while many models of this process have been put forward, none has been able to explain the location, and narrowness, of the volcanic arcs."

Ring of Fire eruptions are extremely violent because the molten rock contains a high proportion of water, which, as superheated steam, powers for the explosive eruptions.

This water comes from the plates descending beneath the volcanoes and lowers the melting point of rocks in the mantle.

"Most previous explanations for the origins of volcanoes suggested that this kind of 'wet' melting is responsible for getting a volcano started," researchers Richard Katz said.

Wet melting occurs over very broad regions of the mantle, inconsistent with the narrowness of the volcanic chains.

Using a mathematical model of heat movement where two plates collide, the Oxford team found the narrowness of the pattern can only be explained if the volcanoes are above narrow regions in which mantle melts in the absence of water.

Researchers say they believe melt rising from this region blazes a trail for more water-rich magma to follow all the way to the surface where it erupts to form volcanoes.




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
Mystery Of Mount Etna Could Be Explained By New Model
Melbourne, Australia (SPX) Oct 13, 2010
Internationally renowned geophysicist Dr Wouter Schellart has developed the first dynamic model to explain the mystery of the largest and most fascinating volcano in Europe, Mount Etna. Dr Schellart's results from fluid dynamic models provide an alternative explanation for the existence of Mount Etna, its geological environment and evolution, as well as volcanism in the surrounding region. ... read more

.
Get Our Free Newsletters Via Email
  


SHAKE AND BLOW
Pakistan told to shape up in exchange for aid

China web users slam nation's mine safety amid Chile rescue

Malnourished Pakistani flood children face winter peril

Pakistan flood damage 9.7 billion dollars: World Bank, ADB

SHAKE AND BLOW
Polymer Behaviors Below The 1 Nanometer Level

Examining How Materials Bond At The Atomic Level

TanDEM-X Leader Has A Connection With Antennas

Breakthrough Promises Bright Fast Displays At Low Power

SHAKE AND BLOW
Crocheted coral exhibit carries environmental warning

Mekong countries should delay dam projects for decade: study

US lifts Gulf of Mexico deepwater drilling ban

Australia Must Have Better Plan For A Variable Water Future

SHAKE AND BLOW
Study: Glaciers protected Antarctic range

Crew circles North Pole in one summer

Himalayan climate change action urged

Disappearing Glaciers Enhanced Biodiversity

SHAKE AND BLOW
Japan biodiversity meet adopts rules on GM crop damages

Extreme weather forces Indonesia to import rice

States rip apart EU bid to fix GM crops mess

U.N. hails eradication of a cattle disease

SHAKE AND BLOW
'Ring of fire' volcano locations explained

Tropical Storm Paula tests Cuba's infrastructure

Cuba on storm alert as Hurricane Paula approaches

Hurricane Paula heads for Mexican tourist coast

SHAKE AND BLOW
Niger former junta number two arrested: family

Europe must reinforce African armies or 'move': Niger

Niger junta leader says no arrests: regional official

Ethiopia signs peace agreement with rebel faction

SHAKE AND BLOW
'Missing link' fossil debated by science

Research Suggests Volcanoes Nixed Neanderthals

Study finds brain changes during sleep

Canadian helps severely disabled speak through music


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