Follow up to related postings on Marcellus Shale and fracking, Oklahoma Geological Survey Open-File Report, OF1-2011, Examination of Possibly Induced Seismicity from Hydraulic Fracturing in the Eola Field, Garvin County, Oklahoma, August 2011
“On January 18, 2011, The Oklahoma Geological Survey (OGS) received a phone call from a resident living south of Elmore City, in Garvin County, Oklahoma, that reported feeling several earthquakes throughout the night. The reporting local resident had also offered that there was an active hydraulic fracturing project occurring nearby. Upon examination there were nearly 50 earthquakes, which occurred during that time. After analyzing the data there were 43 earthquakes large enough to be located, which from the character of the seismic recordings indicate that they are both shallow and unique. The earthquakes range in magnitude from 1.0 to 2.8 Md and the majority of earthquakes occurred within about 24 hours of the first earthquake.”
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