![]() ![]() Use of the output of this website does not imply approval by the governing building code bodies responsible for building code approval and interpretation for the building site described by latitude/longitude location in the search results of this website. In addition, 15 other shocks, intensity V or VI, have originated within Oklahoma. A second intensity VII earthquake, felt over a very small area, occurred in October 1956. The intensity VII (Modified Mercalli Scale) tremor was felt over 362,000 sqaure kilometres. Users of the information from this website assume all liability arising from such use. The strongest and most widely felt earthquake in Oklahoma occurred on April 9, 1952. SEAOC / OSHPD do not intend that the use of this information replace the sound judgment of such competent professionals, having experience and knowledge in the field of practice, nor to substitute for the standard of care required of such professionals in interpreting and applying the results of the seismic data provided by this website. The material presented in this web application should not be used or relied upon for any specific application without competent examination and verification of its accuracy, suitability and applicability by engineers or other licensed professionals. This is compared to the quakes obtained from the 100 preceding 3 days intervals with a standard mean deviation () of 2. In Oklahoma over 90% of the wastewater that is injected is a byproduct of oil extraction process and not waste frack fluid.While the information presented on this website is believed to be correct, SEAOC / OSHPD and its sponsors and contributors assume no responsibility or liability for its accuracy. The total number of quakes above magnitude 2 that occurred during the 3 days in or near Oklahoma was 3, 2 more than usually. The majority of earthquakes in Oklahoma are caused by the industrial practice known as "wastewater disposal". Wastewater disposal is a separate process in which fluid waste from oil and gas production is injected deep underground far below ground water or drinking water aquifers. The largest known fracking induced earthquake in the United States was a M4.0 earthquake that occurred in Texas in 2018. In September and October 2015, three M4+ earthquakes occurred as a sequence along a fault northwest of the Cushing city, Oklahoma, followed by another M5 earthquake in November 2016. Information pertaining to time, magnitude, epicenter. Only earthquakes of greater than or equal to magnitude 4.5 are included. The following is a list of historical earthquakes with epicenters located within the boundaries of Oklahoma. The largest earthquake known to be induced by hydraulic fracturing in Oklahoma was a M3.6 earthquakes in 2019. Oklahoma portion of 2014 National Seismic Hazard Map does not incorporate hazard from induced seismicity. While these earthquakes have been induced by oil and gas related process, few of these earthquakes were induced by fracking. California earthquake counts are shown as a blue bar and Oklahoma earthquake counts are shown as a red bar. 23Oklahoma City SW 7.5 Quadrangle 24Oklahoma City SE 7.5 Quadrangle 25Moore 7.5 Quadrangle 26Franklin 7.5 Quadrangle 27Blanchard 7.5 Quadrangle 28Newcastle 7.5 Quadrangle 29Norman 7.5 Quadrangle 30Denver 7.5 Quadrangle 31Luther 7.5 Quadrangle 32Horseshoe Lake 7.5 Quadrangle 33Harrah 7.5. Bar graph showing the number of M3+ Earthquakes in Oklahoma vs California from 1990 to 2019. A 4.7-magnitude tremor was followed 30 seconds later by another 4.8-magnitude quake centered in a sparsely populated area about 20 miles northwest of Fairview, Oklahoma, about 97 miles northwest. This faulting regime and the fault orientation is consistent with the statistical analysis of earthquake focal mechanisms, in situ stress analysis, field mapping, and 3D seismic interpretation at. ![]()
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