Quakes part of an increase in across Oklahoma, Texas and Kansas that some scientists say could be connected to fracking
The US Geological Survey has recorded seven small earthquakes shaking central Oklahoma in a span of about 14 hours.
The temblors are part of an increase in earthquakes across Oklahoma, Texas and Kansas that some scientists say could be connected to the oil and gas drilling method known as hydraulic fracturing, and especially the wells in which the industry disposes of its wastewater.