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Person of interest identified in connection with deadly Brown University shooting as police gather evidence; Bondi Beach gunmen who killed 15 after targeting Jewish celebration were father and son, police say; Nebraska farmers get help from Washington for crop losses; Study: TX teens most affected by state abortion ban; Gender wage gap narrows in Greater Boston as racial gap widens.

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Debates over prosecutorial power, utility oversight, and personal autonomy are intensifying nationwide as states advance new policies on end-of-life care and teen reproductive access. Communities also confront violence after the Brown University shooting.

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Farmers face skyrocketing healthcare costs if Congress fails to act this month, residents of communities without mental health resources are getting trained themselves and a flood-devasted Texas theater group vows, 'the show must go on.'

USGS: Man-made Earthquakes Up 4,000 Percent in NM

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Monday, April 27, 2015   

SANTA FE, N.M. - Man-made earthquakes in New Mexico, linked to oil and gas exploration, have increased by about 4,000 percent in recent years, according to a new report from the U.S. Geological Survey.

Robert Williams, a geophysicist with the USGS, explains how the millions of gallons of water extracted with oil and gas, and then returned underground through disposal wells, appear to be causing the instability that leads to more earthquakes.

"When you inject that water back into a different location in the earth, you're changing the stress conditions of the rocks," says Williams. "It can lead to changes and stresses on the fault, and weaken those forces holding the fault together, which can then cause an earthquake."

In the first 13 years of this century, Williams says there were 16 earthquakes measured at magnitude 3.8 in New Mexico compared to only one quake of that size in the preceding 32 years. He says the major spike in quake activity began in 2009, and mirrors major growth in oil and gas development. Williams says the USGS will use its research to help in future forecasting of earthquakes.

The report also notes major man-made earthquake increases in Alabama, Arkansas, Colorado, Kansas, Ohio, Oklahoma, and Texas. Williams says last year, Oklahoma, the most active of the states for the first time ever, had more quakes of 'magnitude three' and higher, than California.

"For Oklahoma in 2014, there were 585 earthquakes magnitude three and greater," he says. "California had about 200 of that size."

Prior to 2009, Williams says Oklahoma experienced one or two quakes of a 'magnitude three' or higher each year whereas now, there are one or two quakes that size, each day.


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