Oklahoma Earthquakes Tied to Fracking-related Wastewater Disposal: Statement of the OK Geological Survey

Statement on Oklahoma Seismicity
Oklahoma Geological Survey / statement of Richard D. Andrews and Austin Holland
http://wichita.ogs.ou.edu/documents/OGS_Statement-Earthquakes-4-21-15.pdf

Based on observed seismicity rates and geographical trends following major oil and gas plays with large amounts of produced water, the rates and trends in seismicity are very unlikely to represent a naturally occurring process. Historically, the Oklahoma Geological Survey (OGS) recorded on average about 1½, magnitude three or greater (M3+) earthquakes each year, within Oklahoma. During 2013, the OGS observed on average about 2, M3+ earthquakes each week on average, and this rate continued to increase during 2014. Currently, the OGS is reporting on average about 2½, M3+ earthquakes each day. 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…

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