earthquakes

Though the rate of earthquakes “has declined from its peak,” the 5.8-magnitude earthquake near Pawnee has made 2016 the most seismically active year on record “as measured by seismic energy release,” Oklahoma Geological Survey Director Jeremy Boak tells the Enid News‘ Sally Asher.

Joe Wertz / StateImpact Oklahoma

Federal and state regulators on Monday expanded and modified emergency orders limiting oil and gas activity at wells near a fault line that produced Oklahoma’s strongest earthquake on record.

This Week in Oklahoma Politics, KOSU's Michael Cross talks with ACLU Oklahoma Executive Director Ryan Kiesel and Republican Political Consultant Neva Hill about the political fallout over what has now become the strongest earthquake in Oklahoma history at 5.8 magnitude this past Saturday, the declaration by Governor Fallin of no special session to use $140M in surplus money for teacher raises and a lawsuit by medical marijuana supporters saying Attorney General Scott Pruitt's rewrite of their ballot initiative is biased.

A 5.8-magnitude earthquake rocked Oklahoma on Saturday, prompting Gov. Mary Fallin to declare a state of emergency. On Wednesday, officials said it was the strongest quake in the state’s history.

The quake followed a string of thousands of smaller tremors that have raised questions about the impact of drilling for oil and gas, and the controversial technique of hydraulic fracturing, also known as fracking.

Joe Wertz / StateImpact Oklahoma

The U.S. Geological Survey is upgrading the strength of an earthquake that shook the state on Sept. 3 to 5.8 magnitude. That change makes the Labor Day weekend temblor the most powerful earthquake ever recorded in Oklahoma. The quake is the latest in a seismic surge researchers say has largely been fueled by the oil industry practice of pumping waste fluid into underground disposal wells.

Joe Wertz / StateImpact Oklahoma

Federal regulators have shut down 17 wastewater disposal wells in the Osage Nation of northeastern Oklahoma following a weekend earthquake that matched the state's strongest on record.

Because the wells are located on tribal land, Oklahoma regulators have no jurisdiction over oil- and gas-producing facilities in the region. Oklahoma Corporation Commissioner Matt Skinner told The Associated Press that the U.S. Environmental Protection Agency notified the state Tuesday that 17 wells were ordered closed.

Bridges in Oklahoma are safe to travel after Saturday’s 5.6 magnitude earthquake.

Department of Transportation Director Mike Patterson says his crews inspected more than 180 bridges in Oklahoma.

"There were three field divisions that responded out of Tulsa, Perry and Buffalo to get those bridges inspected and provide some safe confidence to the traveling public that everything was okay."

In all the crews managed to complete an in depth look at all the bridges about five hours after the quake.

Joe Wertz / StateImpact Oklahoma

After one of the strongest earthquakes ever to hit Oklahoma struck Saturday, state regulators ordered oil and gas companies to shut down all their wastewater disposal wells in a 725-square-mile area around the site of the quake's epicenter near Pawnee.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

MICHEL MARTIN, HOST:

An earthquake struck northern Oklahoma early Saturday morning, rattling houses and waking residents in the region around Pawnee, about 74 miles north of Oklahoma City. Preliminary measurements show the quake had a magnitude of 5.6 — believed to be one of the strongest in state history.

The quake was felt in five states, according to the U.S. Geological Survey: Oklahoma, Kansas, Missouri, Arkansas and Texas. It struck just after 7 a.m. local time, at a depth of 6 kilometers (3.7 miles).

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