Oklahoma's magnitude 5.6 quake comes amid concerns around oil and gas boom
 

Oklahoma's magnitude 5.6 quake comes amid concerns around oil and gas boom
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A record-tying earthquake rattled Oklahoma and five surrounding states on Saturday morning.

The 5.6.-magnitude temblor near Pawnee, Oklahoma, is one of thousands to strike the state in the last few years.

State and federal scientists say the swarm of earthquakes in central and **rth-central Oklahoma is connected to the area's oil and gas companies, which are pumping copious amounts of drilling wastewater into underground disposal wells.

SEE ALSO: Here's why Italy is prone to devastating earthquakes


Oklahoma's Gov. Mary Fallin this weekend declared a state of emergency for Pawnee County after the earthquake struck on Sept. 3 near Pawnee, a city of about 2,200 people. Read more...

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