![]() At the time, it was the strongest earthquake ever recorded in Oklahoma. Ī magnitude 5.5 earthquake had occurred near El Reno on April 9, 1952 at 10:29 a.m. The total affected area was approximately 20,000 km 2 (7,700 sq mi). On September 27, 1929, another tremor of intensity VI was centered in the same area and was felt in central and western Oklahoma minor damage occurred in nearby areas and one chimney fell. The first earthquake known to have occurred within the boundaries of Oklahoma since the state was established occurred in September 1918 when a series of shocks was felt in El Reno, Oklahoma, the strongest of which was an estimated intensity V on September 10. By mid-March 2016, there were already 226 earthquakes of magnitude 3.0 and larger in the CEUS. In 2015 there were 1,010 earthquakes in the CEUS region. (CEUS) had undergone the most dramatic increase in seismic activity in the United States since 2009 with an average of 318 earthquakes of magnitude 3.0 a year up from 24 a year from 1973 to 2008. Although the 2011 earthquake was the largest on record until that time, the USGS reported that the central and eastern U.S. On March 28, 2016 the USGS released the USGS National Seismic Hazard Map which concluded that the primary cause of the earthquake in Oklahoma in 2011 was pressure on fault lines from cumulative effects of injecting oil drilling wastewater under high pressure into the underground. In March 2013, a peer-reviewed paper published by a research team led by seismologist Katie Keranen at the University of Oklahoma in the scientific journal Geology reported that "the volume of fluid injected into the subsurface related to the production of unconventional resources continues to rise" and that there was a link between the "zone of injection and the seismicity" potentially triggering the Prague earthquake. Other swarms have been observed in south-central Kansas and North Texas. ![]() By June 26, 2014, no fewer than six individual earthquake sequences in Oklahoma had been identified and named by the Oklahoma Geological Survey (OGS). In response to the major increase in earthquakes in the Central United States, the United States Geological Survey (USGS) began developing a new seismic hazard model to account for risk associated with induced seismicity. Numerous seismologists had advised local residents of an even greater risk of earthquakes in 2014, by which time the number of earthquakes had increased to a dangerously high level. Simultaneously, the USGS upgraded the magnitude of the Prague earthquake to 5.7. The 2016 earthquake was initially reported to be an identical 5.6 magnitude, but this was later upgraded to 5.8, making it the strongest earthquake on record. The 2011 Prague earthquake, at reported magnitude 5.6, was at the time the strongest recorded earthquake in the history of Oklahoma. Two of the most significant earthquakes in these swarms were the November 5, 2011 Prague earthquake east of the Oklahoma City area and the Septemearthquake near Pawnee, north of Prague. Scientific studies attribute the rise in earthquakes to the disposal of wastewater produced during oil extraction that has been injected more deeply into the ground. Thousands of earthquakes have occurred in Oklahoma and surrounding areas in southern Kansas and North Texas since 2009. state of Oklahoma rapidly increased from an average of fewer than two 3.0+ magnitude earthquakes per year since 1978 to hundreds each year in the 2014–17 period. Beginning in 2009, the frequency of earthquakes in the U.S. The Oklahoma earthquake swarms are an ongoing series of human activity-induced earthquakes affecting central Oklahoma, southern Kansas, northern Texas since 2009.
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