More than 70 earthquakes hit Oklahoma this week, causing alarm over drilling in the state.<br />State officials at the Oklahoma Geological Survey warn that drilling for oil and natural gas may be the culprit, particularly the use of injection wells, reports USA Today.<br />“The OGS considers it very likely that the majority of recent earthquakes, particularly those in central and north-central Oklahoma, are triggered by the injection of produced water in disposal wells,” the agency announced.<br />Earthquakes have become a common occurrence in states like Texas, Kansas, Arkansas, Colorado and Oklahoma—where the state has seen an uptick in magnitude-3 or greater quakes, from 109 in 2013 to 585 in 2014, according to USA Today.<br />This past year is still being computed.
