Oklahoma officials are still assessing the damage from an earthquake that shook at least six states Saturday morning. The magnitude 5.6 quake, centered just south of the Kansas border was felt throughout eastern Kansas and western Missouri and as far north as Lincoln, Nebraska. Parts of northern Oklahoma and southern Kansas have seen a dramatic rise in the frequency and magnitude of earthquakes during the past few years. The Oklahoma Corporation Commission has shut down nearly 40 wastewater disposal wells in the area around Pawnee where Saturday's temblor was centered. Many of those wastewater wells lie on top of earthquake fault lines and Rex Buchanan of the Kansas Geological Survey says many experts are concerned about the potential for more seismic activity.
Those deep underground injection wells are associated with the hydraulic fracturing process used in oil and gas drilling.
