More drilling-linked earthquakes rattle Oklahoma

2015-07-28 12:46

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Oklahoma City - Several earthquakes shook Oklahoma on Monday as the state experiences a sharp increase in the frequency of tremors linked to wastewater disposal from gas and oil drilling, including from fracking, state and federal officials said.

Three of Monday's quakes measured above a magnitude 4.0, with a 4.5 earthquake centred just north of Crescent, roughly 72km north of Oklahoma City, the US Geological Survey (USGS) said.

The largest tremor, logged a "significant earthquake" by the USGS, could be felt as far away as Wichita, Kansas, about 260km north, broadcaster KOTV reported.

There were no reports of damage.

The rate of earthquakes in Oklahoma has increased by about 50% since 2013, greatly increasing the chance for a damaging quake, according to the USGS.

Noticeable quakes - above magnitude 3.0 - now hit the state at a rate of two per day or more, compared with two or so per year prior to 2009. During the past seven days, Oklahoma has experienced about 40 earthquakes, according to the USGS.

Scientists say the seismic activity is triggered by the injection of wastewater from booming oil and gas drilling operations into deep geological formations.

The state's oil and gas regulator released a directive this month expanding "Areas of Interest", parts of the state that have been worst-hit by the quakes, and adding restrictions for 211 disposal wells.

In March, the regulator – the Oklahoma Corporation Commission – also directed 347 wells to reduce their injection depths to above the Arbuckle formation. High-volume injections into the Arbuckle, the state's deepest formation, have the highest potential for seismic activity, according to the USGS.

Twenty-one of Oklahoma's 77 counties are under the order, and oil and gas drilling operators have until August 14 to comply with reducing injection depth.

Read more on:    us  |  earthquakes

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