The study did not investigate whether hydraulic fracturing – better known as fracking – was causing the faults to be reactivated.
Any larger earthquake could be worsened by the fact that building codes in Oklahoma aren't as strict as areas like California, Reuters reported. That's especially worrisome because there are as many as 12 fault zones capable of triggering a magnitude-5 or -6 earthquake. More than a dozen homes and multiple businesses sustained damage from a 5.6-magnitude temblor back in 2011. Last year there were 5,417 earthquakes in Oklahoma, and 585 of those quakes were magnitude-3 or larger, according the Oklahoma Geological Survey,
http://www.weather.com/news/news/oklahoma-earthquakes-fault-line
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