Sound The Trumpet : Californian Drought is so Severe It's 'Causing the Ground to Move'

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“Californian Drought is so Severe It's 'Causing the Ground to Move'”
by independent.co.uk
August 31st, 2014

Scientists says 63 trillion gallons of water has been lost on west coast of the United States

Vanishing water is causing the ground to rise in the western United States, according to a new study.

Scientists estimate that 63 trillion gallons of water has been lost in the west over the past 18 months.

The surface of the Earth is much more springy than you might think. When you put something very heavy on it, there’s a good chance the ground will sink at least a little bit. And in the same way, when you remove something very heavy, the ground will lift.

As it turns out, 63 trillion gallons of water is pretty heavy.

That is how much water scientists at Scripps Institution of Oceanography at UC San Diego estimate has gone missing from the western US over the past 18 months. That incredible water deficit weighs nearly 240 billion tons, and as it evaporated, the ground began to shift.

A network of GPS devices, the Plate Boundary Observatory, is laid out in the western US, used to study shifting tectonic plates. As small earthquakes happen, the distance that the ground shifts can be measured with the same technology that gets you from here to there in your car.

Below is a sequence of images of Lake Oroville in California, which show high water levels pictured in July 2011 and images taken this month of significantly lower levels caused by the drought

Above: High and low water levels at a section of Lake Oroville near the Bidwell Marina in Oroville, California pictured in 2011 and 19 August 2014

The Green Bridge of Lake Oroville

The Bidwell Marina in Oroville

The lake is currently at 32 per cent of its total 3,537,577 acre feet While scouring the GPS data, researchers noticed that the ground was slowly rising beneath their feet, coinciding with the drought. Taking a closer look, they found that across the western US, the ground has risen an average of 0.15 in since 2013. The effect is much more pronounced in the mountains of California, where the uplift was as high as half an inch.

Using these measurements, scientists were able to put a number on the vast amount of water that the West has lost. Scripps scientist Dan Cayan is hopeful these results can prove to be helpful in monitoring water shortages across the globe. “These results demonstrate that this technique can be used to study changes in fresh water stocks in other regions around the world, if they have a network of GPS sensors,” Cayan said in a press release.

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