The US Geological Survey (USGS) reported that nine quakes ranging in magnitude from 2.5 to 3.7 were recorded between 5.07pm on Saturday and 5.27am on Sunday. No injuries or damage were reported. Geologists say damage is not likely in quakes below magnitude 4.0.
The Guardian, 11 October 2015
http://www.theguardian.com/world/2015/oct/11/small-earthquakes-oklahoma-crude-oil-storage-hub