Keranen, Katie M.; Savage, Heather M.; Abers, Geoffrey A.; Cochran, Elizabeth S. (2013). "Potentially induced earthquakes in Oklahoma, USA: Links between wastewater injection and the 2011 Mw 5.7 earthquake sequence". Geology. 41 (6): 699–702. Bibcode:2013Geo....41..699K. doi:10.1130/G34045.1.via EBSCO
Keranen, Katie M.; Savage, Heather M.; Abers, Geoffrey A.; Cochran, Elizabeth S. (2013). "Potentially induced earthquakes in Oklahoma, USA: Links between wastewater injection and the 2011 Mw 5.7 earthquake sequence". Geology. 41 (6): 699–702. Bibcode:2013Geo....41..699K. doi:10.1130/G34045.1.via EBSCO
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"Earthquake Summary". Magnitude 5.6 – Oklahoma. United States Geological Survey. Archived from the original on January 13, 2015. Retrieved November 6, 2011.