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SCOTUS skeptical that state abortion bans conflict with federal health care law; Iowa advocates for immigrants push back on Texas-style deportation bill; new hearings, same arguments on both sides for ND pipeline project; clean-air activists to hold "die-in" Friday at LA City Hall.

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"Squad" member Summer Lee wins her primary with a pro-peace platform, Biden signs huge foreign aid bills including support for Ukraine and Israel, and the Arizona House repeals an abortion ban as California moves to welcome Arizona doctors.

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The urban-rural death divide is widening for working-age Americans, many home internet connections established for rural students during COVID have been broken, and a new federal rule aims to put the "public" back in public lands.

UNR Research Links CA Water Use to Land Shifts, Earthquakes

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Tuesday, May 20, 2014   

RENO, Nev. - Research from the University of Nevada-Reno (UNR) has linked water extraction in California's Central Valley to upward movement of the Sierra Nevada mountains and earthquakes on the San Andreas Fault. Professor Geoff Blewitt with the UNR College of Science says his research shows that draining the aquifer beneath the Central Valley for farm irrigation causes the earth's surface in that area to flex upward.

The 400-mile long Sierra Nevada range is lifting as much as three millimeters per year, he says.

"With that massive extraction of water, there's less pressure on the Earth's crust. And with less pressure, the Earth rebounds in an elastic way. It's like a spring," Blewitt explains.

The study is based on detailed Global Positioning System (GPS) measurements from California and Nevada, he says, adding that the real importance of the research is that it demonstrates a potential link between human activity and its impact on the "solid" Earth.

Blewitt says pumping trillions of gallon of water out of the aquifer over the past century and a half is also impacting the San Andreas Fault, by prompting movements that can cause earthquakes to happen faster.

"What's stopping earthquakes from happening is this force that is pushing one side of the San Andreas fault against the other. It's like friction. It's reducing that force so it makes it easier for earthquakes to happen. So, it might precipitate earthquakes sooner than they would have occurred otherwise," he postulates.

Blewitt says it's unclear what effect draining the aquifer might have on bigger earthquakes, because they don't happen often enough to make a determination.





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