Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. Earth Science News .




SHAKE AND BLOW
Water extraction boosts California quake risk: study
by Staff Writers
Paris (AFP) May 14, 2014


Strong 6.1-magnitude quake hits near Micronesia: USGS
Wellington (AFP) May 14, 2014 - A strong 6.1-magnitude earthquake struck near Micronesia on Thursday, geologists said, but no tsunami warning was issued.

The quake hit at 6:56 am (2056 GMT Wednesday) at a depth of 10 kilometres (six miles), 99 kilometres south-southeast of Ifalik in Micronesia, the United States Geological Survey (USGS) said.

The Hawaii-based Pacific Tsunami Warning Center said there was no threat of a destructive widespread tsunami.

Relentless pumping of water to irrigate farms in part of California's Central Valley is boosting the risk of earthquakes on the San Andreas fault, geologists said on Wednesday.

A century and a half of water extraction has bit by bit released a massive weight on a local part of the Earth's crust, causing it to spring up and ease a brake on the notorious fault, they said.

"This process brings the fault closer to failure," the experts said in a study published in the journal Nature.

They did not say if a large quake could result, or when or where it may strike.

The region, the San Joaquin Valley, is one of the world's breadbaskets, providing a huge and plentiful variety of crops.

But it has very little rainfall, so the irrigation water is not being replenished.

According to the scientists' calculations, farmers in the valley have extracted around 160 cubic kilometers (38 cubic miles) of groundwater since 1860.

This is slightly more than Lake Tahoe, the 27th biggest lake in the world by volume.

The extraction has caused the crust surrounding the valley to lift by about one to three millimetres (0.04 to 0.12 inches) per year, according to Global Positioning System (GPS) measurements.

At the same time, southern parts of the valley have subsided as the porous rock below, deprived of water, starts to compact.

The long-term rebound, along with seasonal uplift in late summer when groundwater levels are at their lowest, is slyly easing the vertical clamp on the San Andreas fault running down southern California, the team believe.

Evidence for this comes from seasonal episodes of mini-quakes at a monitoring site at Parkfield in late summer and autumn, the paper said.

The findings should prompt a rethink of earthquake risk prediction, said the authors, led by Colin Amos of Western Washington University in Washington state.

Estimates are typically based on a fault's seismic history and knowledge of the friction mechanics of the crustal plates that are in contact with each other.

But man-made forces such as groundwater loss may be playing "a new and unappreciated" role in the process, the study said.

.


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






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




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





SHAKE AND BLOW
Questions remain as China remembers 6 years since quake
Beijing (AFP) May 12, 2014
Six years after a huge earthquake killed tens of thousands of people in China, questions over poor building work and corruption were still being asked on Monday's anniversary, as online posters remembered the dead. More than 80,000 were left dead or missing when a 8.0 magnitude tremor struck Sichuan on the afternoon of May 12 2008, including 5,335 school pupils. The disaster provoked wid ... read more


SHAKE AND BLOW
Australia commits up to $84 million to MH370 search

Tech troubles hinder resumption of MH370 search

Hollywood revives Godzilla, Japan's 'king of monsters'

Italy warns EU on asylum as shipwreck survivors land

SHAKE AND BLOW
Ultrafast laser technique developed to observe electron action

Quantum trimer -- from a distance

Conducting polymer films decorated with biomolecules for cell research use

The Tallest Skyscrapers Currently Under Construction

SHAKE AND BLOW
The physics of ocean undertow

MH370 search on hold after trouble with mini-sub

Imploding sub a 'tragic loss': Titanic director

Eight dead, hundreds ill from 'tainted water' in Philippines

SHAKE AND BLOW
West Antarctic Glacier Loss Appears Unstoppable

A Slow Collapse As West Antarctic Melts

Greenland melting due equally to global warming, natural variations

International team maps nearly 200,000 global glaciers in quest for sea rise answers

SHAKE AND BLOW
Corn dwarfed by temperature dip suitable for growing in caves, mines

Winners and losers in cereal production from El Nino

Bee biodiversity boosts crop yields

Study says pesticides to blame for honeybee colony collapse

SHAKE AND BLOW
Questions remain as China remembers 6 years since quake

Water extraction boosts California quake risk: study

Three dead in China rain storms: government

Yellowstone Geyser Eruptions Mostly Influenced By Internal Processes

SHAKE AND BLOW
Meni Mbugha brings pygmy style to city life in DR Congo

Troops needed to shore up shaky South Sudan peace: US

US general in Nigeria to aid search for schoolgirls

No US troops to aid search for Nigeria schoolgirls: Hagel

SHAKE AND BLOW
US military opens door to gender treatment for Manning

Preschool teacher depression linked to behavioral problems in children

Longevity gene may boost brain power

Rocks lining Peruvian desert pointed to ancient fairgrounds




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news 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 Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.