Tag Archives: man-made earthquakes

21Feb/15
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USGS: Fracking Is The Cause of Earthquakes In Oklahoma

OKLAHOMA — It’s the million dollar question in Oklahoma: What’s causing all the earthquakes?

There have been a lot of theories about fracking causing earthquakes. But now, the U.S. Geological Survey (USGS) says that fracking, is indeed, to blame. Continue reading

15Feb/15
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California Loses Earthquake Crown to Oklahoma

Oklahoma rocketed to the top of the earthquake charts in 2014, tripling the number of 3.0 shakers in California, the one-time undisputed champion of the United States.

But like the steroid scandal that tarnished baseball and ruined the statistical landscape in the 1990s, many scientists are pointing to the introduction of performance-enhancing chemicals to explain the recent 40-fold-plus increase in quakes—in Oklahoma’s case, hydraulic fracturing (fracking). Continue reading

22Sep/14
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And then, we saw it…

Stillwater, OK. It was July. We were driving in unfamiliar territory in central Oklahoma, navigating through dusty, hot ranching communities and along miles of barbwire fence that separated us from distant livestock. The GPS spouted off a series of commands that led to narrower roads with horses, cattle, and homes closer to the fence lines. A mile or so beyond where the pavement ended, we saw it. Continue reading

31May/14
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Earthquake – M3.2 – 9km ENE of Greeley, Colorado

Induced Seismicity

As is the case elsewhere in the world, there is evidence that some central and eastern North America earthquakes have been triggered or caused by human activities that have altered the stress conditions in earth’s crust sufficiently to induce faulting. Activities that have induced felt earthquakes in some geologic environments have included impoundment of water behind dams, injection of fluid into the earth’s crust, extraction of fluid or gas, and removal of rock in mining or quarrying operations. In much of eastern and central North America, the number of Continue reading

07Mar/14
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Wastewater Injection Triggered Oklahoma’s Earthquake Cascade

One of Oklahoma’s biggest man-made earthquakes, caused by fracking-linked wastewater injection, triggered an earthquake cascade that led to the damaging magnitude-5.7 Prague quake that struck on Nov. 6, 2011, a new study confirms.

The findings suggest that even small man-made earthquakes, such as those of just a magnitude 1 or magnitude 2, can trigger damaging quakes, said study co-author Elizabeth Cochran, a seismologist with the U.S. Geological Survey.

“Even if wastewater injection only directly affects a low-hazard fault, those smaller events could trigger an event on a larger fault nearby,” she told Live Science. Continue reading