Earthquakes

5:00am

Sat August 9, 2014
Energy

Earthquakes Taper Off At Greeley Injection Well

A seismograph near a Greeley injection well in early June 2014.
Jim Hill KUNC

A scientist monitoring earthquakes near a Weld County wastewater injection well said the tremors have decreased significantly in both number and intensity.

"Seismicity has been very low," since the well – which had been shut down for 20 days – was reopened, said Anne Sheehan, a geophysics professor at the University of Colorado Boulder. 

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2:52pm

Thu July 17, 2014
Energy

Greeley Injection Well Possibly Linked To Quakes, Regulators Require Changes

Trucks delivering waste water to an injection well in Platteville, Colo. The site pictured is not involved in any current seismic activity.
William Ellsworth USGS

The Colorado Oil and Gas Conservation Commission is requiring operators of a Weld County injection well to alter how wastewater is disposed of in that well, saying they believe the well may be linked to recent earthquakes in the area.

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11:59am

Thu July 3, 2014
Environment

Researchers Link Quakes With Oklahoma Wells, Colorado Study Ongoing

Oilfield waste arrives by truck at a wastewater disposal facility near Platteville, Colo., Jan. 2013. No earthquakes are associated with injection at the site in this photograph.
William Ellsworth USGS

Scientists have linked earthquakes in Oklahoma with wastewater injection wells associated with the oil and gas industry, in a new paper published in the journal Science.

Four injection wells with a "high rate" of injection, meaning they accepted a large quantity of barrels of wastewater per month, likely caused 20 percent of earthquakes in that area from 2008-2013, the researchers said.

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8:00am

Sat June 28, 2014
An Eneregy Travelogue

Liquid Drill Waste, Quakes And Spills: Connecting Both East And West

Journalists canoe Ohio's Cuyahoga River. Its pollution in the 1960s inspired the modern environmental movement.
Stephanie Paige Ogburn KUNC

The headwaters of the Cuyahoga River run smooth and pudding-brown; warblers dart through flooded underbrush, and the canoe I'm in travels swiftly and silently downstream.

This river, an icon of the modern environmental movement, is perhaps most famous for catching fire multiple times in the 1960s and catalyzing the series of environmental protections the U.S. Congress passed in that era. It's now mostly clean, and serves as a symbol for another environmental problem -- the potential risk the natural gas boom poses to clean water in Ohio and other states experiencing a rush of energy activity.

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5:30am

Wed June 25, 2014
Oil and Gas

COGCC's Lepore: No 'Causative Determination' Yet On Second Greeley Quake

One of the seismometers placed by a team from the University of Colorado following a quake at the end of May. The network detected a 2.6 magnitude event June 23, prompting regulators to halt activity at a nearby injection well.
Jim Hill KUNC

The Colorado Oil and Gas Conservation Commission has ordered a 20 day halt to wastewater injection at a well near the Greeley/Weld County airport. The order follows a second earthquake in the Greeley area, a 2.6 magnitude event June 23.

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