News / Science & Technology

    Western US Drought Causing Earth's Crust to Rise

    A GPS station is seen in the Inyo Mountains of California. (Shawn Lawrence, UNAVCO)
    A GPS station is seen in the Inyo Mountains of California. (Shawn Lawrence, UNAVCO)

    The major drought gripping the western United States is not only drying the landscape, it’s causing the land to rise.

    Researchers at Scripps Institution of Oceanography at the University of California at San Diego used GPS data to determine the drought has caused the land to rise, on average, 4 millimeters across the western states. The Sierra mountains of California rose over half an inch.

    Duncan Agnew, a Scripps Oceanography geophysics professor and co-author of the paper said that “in areas of deep soil, the material behaves like a sponge. When the water dries out, it shrinks or goes down.”

    “If you’re not on deep spoil the effect is that the earth is like a spring,” he said “The water is no longer pressing down on that area so it rises.”

    That’s what’s happening in the western U.S., and the findings quantify the staggering water loss wrought by the drought.

    Based on the findings, Agnew said he and his team believe the water loss due to the drought exceeds 240 trillion liters of water.

    “It’s like covering the western half of the U.S. with a layer of water 10 centimeters thick,” he said.

    If the drought lifts, expect the land to fall under the weight of the water. In fact, Agnew said, there was a downward shift in 2011, which saw a very wet winter.

    Agnew said the rise would not effect California’s earthquake prone San Andreas Fault.

    “It does change the stress on the fault, but by a very small amount,” he said. “It’s the same pressure you’d feel putting your hand in an inch of water.”

    Last year was the driest on record in California, and this year may be just as dry.  

    Some reservoirs are empty and the Sierra mountain snowpack, which melts and fills rivers in the springtime, is at dangerously low levels - just one quarter of normal.  

    Farmers warn of another "Dust Bowl" - referring to the drought and dust storms that ravaged American farmlands in the 1930s.  

    The drought is so bad that California Governor Jerry Brown called it “epochal.”

    Eighty percent of the state is experiencing “extreme” or “exceptional” drought, leading to strict measures restricting the use of water.

    Agnew’s paper appears in the August 21 online edition of the journal Science.

    You May Like

    Hope Remains for Rio Olympic Games, Despite Woes

    Facing a host of problems, Rio prepares for holding the games but experts say some risks, like Zika, may not be as grave as initially thought

    IS Use of Social Media to Recruit, Radicalize Still a Top Threat to US

    Despite military gains against IS in Iraq and Syria, their internet propaganda still commands an audience; US officials see 'the most complex challenge that the federal government and industry face'

    ‘Time Is Now’ to Save Africa’s Animals From Poachers, Activist Says

    During Zimbabwe visit, African Wildlife Foundation President Kaddu Sebunya says poaching hurts Africa as slave trade once did

    This forum has been closed.
    Comment Sorting
    Comments
         
    by: tom carney from: new jersey
    September 01, 2014 5:25 PM
    In about 700-800 AD wasn't there a 200-year drought over what is now the American Southwest? Didn't it last long enough and be severe enough to move whole peoples from the area of Chaco Canyon and Mesa Verde down to where today's North American Pueblos are? If true, this is really not a unique situation, no? Just unique in our times?

    by: Mark from: Arizona
    August 24, 2014 1:51 PM
    We are fine with water in Arizona. Been raining here all over for 2 months now.

    Featured Videos

    Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
    Ivorian Chocolate Makers Promote Locally-made Chocolatei
    X
    July 29, 2016 4:02 PM
    Ivory Coast is the world's top producer of cocoa but hardly any of it is processed into chocolate there. Instead, the cocoa is sent abroad to chocolate makers in Europe and elsewhere. This is a general problem throughout Africa – massive exports of raw materials but few finished goods. As Emilie Iob reports from Abidjan, several Ivorian entrepreneurs are working to change that formula - 100 percent Ivorian chocolate bar at a time.
    Video

    Video Ivorian Chocolate Makers Promote Locally-made Chocolate

    Ivory Coast is the world's top producer of cocoa but hardly any of it is processed into chocolate there. Instead, the cocoa is sent abroad to chocolate makers in Europe and elsewhere. This is a general problem throughout Africa – massive exports of raw materials but few finished goods. As Emilie Iob reports from Abidjan, several Ivorian entrepreneurs are working to change that formula - 100 percent Ivorian chocolate bar at a time.
    Video

    Video Tesla Opens Battery-Producing Gigafactory

    Two years after starting to produce electric cars, U.S. car maker Tesla Motors has opened the first part of its huge battery manufacturing plant, which will eventually cover more than a square kilometer. Situated close to Reno, Nevada, the so-called Gigafactory will eventually produce more lithium-ion batteries than were made worldwide in 2013. VOA's George Putic reports.
    Video

    Video Polio-affected Afghan Student Fulfilling Her Dreams in America

    Afghanistan is one of only two countries in the world where children still get infected by polio. The other is Pakistan. Mahbooba Akhtarzada who is from Afghanistan, was disabled by polio, but has managed to overcome the obstacles caused by this crippling disease. VOA's Zheela Nasari caught up with Akhtarzada and brings us this report narrated by Bronwyn Benito.
    Video

    Video Hillary Clinton Promises to Build a 'Better Tomorrow'

    Democratic presidential candidate Hillary Clinton urged voters Thursday not to give in to the politics of fear. She vowed to unite the country and move it forward if elected in November. Clinton formally accepted the Democratic Party's nomination at its national convention in Philadelphia. VOA national correspondent Jim Malone has more.
    Video

    Video Trump Tones Down Praise for Russia

    Republican presidential candidate Donald Trump is toning down his compliments for Russia and Vladimir Putin as such rhetoric got him in trouble recently. After calling on Russia to find 30.000 missing emails from rival Hillary Clinton, Trump told reporters he doesn't know Putin and never called him a great leader, just one who's better than President Barack Obama. Putin has welcomed Trump's overtures, but, as Zlatica Hoke reports, ordinary Russians say they are not putting much faith in Trump.
    Video

    Video Uganda Unveils its First Solar-powered Bus

    A solar-powered bus described by its Ugandan makers as the first in Africa has made its public debut. Kiira Motors' electric bus, Kayoola, displayed recently at a stadium in Uganda's capital. From Kampala, Maurice Magorane filed this report narrated by Salem Solomon.
    Video

    Video Silicon Valley: More Than A Place, It's a Culture

    Silicon Valley is a technology powerhouse and a place that companies such as Google, Facebook and Apple call home. It is a region in northern California that stretches from San Francisco to San Jose. But, more than that, it's known for its startup culture. VOA's Elizabeth Lee went inside one company to find out what it's like to work in a startup.
    Video

    Video Immigrant Delegate Marvels at Democratic Process

    It’s been a bitter and divisive election season – but first time Indian-American delegate Dr. Shashi Gupta headed to the Democratic National Convention with a sense of hope. VOA’s Katherine Gypson followed this immigrant with the love of U.S. politics all the way to Philadelphia.
    Video

    Video Dutch Entrepreneurs Turn Rainwater Into Beer

    June has been recorded as one of the wettest months in more than a century in many parts of Europe. To a group of entrepreneurs in Amsterdam the rain came as a blessing, as they used the extra water to brew beer. Serginho Roosblad has more to the story.
    Video

    Video Commerce Thrives on US-Mexico Border

    At the Democratic Convention in Philadelphia this week, the party’s presumptive presidential nominee, Hillary Clinton, is expected to attack proposals made by her opponent, Republican presidential nominee Donald Trump, to build a wall along the U.S.-Mexico border. Last Friday, President Barack Obama hosted his Mexican counterpart, President Enrique Peña Nieto, to underscore the good relations between the two countries. VOA’s Greg Flakus reports from Tucson.
    Video

    Video Film Helps Save Ethiopian Children Thought to be Cursed

    'Omo Child' looks at effort of African man to stop killings of ‘mingi’ children
    Video

    Video London’s Financial Crown at Risk as Rivals Eye Brexit Opportunities

    By most measures, London rivals New York as the only true global financial center. But Britain’s vote to leave the European Union – so-called ‘Brexit’ – means the city could lose its right to sell services tariff-free across the bloc, risking its position as Europe’s financial headquarters. Already some banks have said they may shift operations to the mainland. Henry Ridgwell reports from London.

    Special Report

    Adrift The Invisible African Diaspora