A jar holding waste water from hydraulic fracturing is held up to the light at a recycling site in Midland, Texas. (AP Photo/Pat Sullivan)

Many chemicals used in Texas fracking remain a mystery

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For the past five years, biochemist Zac Hildenbrand has investigated potential links between unconventional drilling and water quality, collecting thousands of samples throughout the major shale plays in Texas.
Texas will deploy additional sensors to study a rash of earthquakes shaking the state as researchers try to determine whether the tremors are linked to the underground disposal of oilfield waste.
(martinluff/Flickr)

First research links California quakes to oil operations

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In Kern County, the shaking topped out on Sept. 22, 2005, with three quakes, the biggest magnitude 4.6, researchers said.
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U.S. to halt approvals of hydraulic fracturing off California coast

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The government will study whether the practice is safe for the environment.
Todd Halihan, a hydrogeology professor at Oklahoma State University, answers questions during an earthquake forum at the Capitol hosted by Rep. Richard Morrissette, D-Oklahoma City. Friday, Jan. 15, 2016, in Oklahoma City, Okla.  (Chris Landsberger/The Oklahoman via AP) LOCAL STATIONS OUT (KFOR, KOCO, KWTV, KOKH, KAUT OUT); LOCAL WEBSITES OUT; LOCAL PRINT OUT (EDMOND SUN OUT, OKLAHOMA GAZETTE OUT) TABLOIDS OUT; MANDATORY CREDIT

More quakes rattle Oklahoma, but state avoids tough measures

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The quakes, which have been mostly small to medium sized, have caused limited damage, and no one foresees anything like the massive damage and deaths in the famous quakes in California, seismologists say.
In this June 26, 2014 file photo, Austin Holland, research seismologist at the Oklahoma Geological Survey, hangs up a chart depicting earthquake activity at their offices at the University of Oklahoma in Norman, Okla. A study published Thursday, July 3, 2014 by the journal Science explains how just four wells forcing massive amounts of drilling wastewater into the ground are probably causing quakes in Oklahoma. The wells seem to have triggered more than 100 small-to-medium earthquakes in the past five years, according to a study (AP Photo/Sue Ogrocki, File)

Oklahoma regulators order reduced injection well volumes after quakes

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The Oklahoma Geological Survey has said it is “very likely” that most earthquakes are triggered by the subsurface injection of wastewater from the drilling operations.
Texas will deploy additional sensors to study a rash of earthquakes shaking the state as researchers try to determine whether the tremors are linked to the underground disposal of oilfield waste.
(martinluff/Flickr)

Oklahoma officials, company try settling disposal well fight

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The Oklahoma Corporation Commission issued a voluntary directive to a dozen energy companies Dec. 3 after the Medford and Cherokee area felt a swarm of earthquakes, including a 4.7-magnitude quake.
Technip's office at 11700 Old Katy Rd. in Houston (Carlos Antonio Rios/Houston Chronicle)

Air Products contracts Technip to build $400 million Baytown plant

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Pennsylvania-based Air Products is planning for the world-scale steam methane reformer plant in Texas to produce 125 million cubic feet a day of hydrogen and carbon monoxide, much of which will ship through its Gulf Coast pipeline that runs from the Houston Ship Channel to New Orleans.
(Flickr user martinluff)

4 quakes of magnitude 4.0 or more hit northwest Oklahoma

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The Oklahoma Corporation Commission, which regulates the state’s oil and natural gas industry, on Monday ordered five wastewater injection wells to reduce volume after a swarm of quakes.
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The EPA called fracking safe. Now its scientists disagree.

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An EPA spokeswoman said the agency will use comments from the scientists and the public to “evaluate” possible changes to the report.
(Flickr user martinluff)

Hundreds more earthquakes jolt Oklahoma in 2015

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Quakes have been on the rise in Oklahoma following a boom in oil and gas activity — state officials have blamed the seismic activity on an increase in wastewater injections in drilling areas.