<P> The United States Geological Survey updated its National Seismic Hazard Map in 2014; however, potentially induced earthquakes were intentionally not considered in this analysis as geologists were uncertain how to incorporate non-tectonic earthquakes . Several months later in April 2015, a comprehensive assessment was released analyzing the link between the increase in seismic activity in the Central United States and oil and gas operations . Seventeen induced seismicity zones for earthquakes over the past 50 years were delineated in this assessment, including one region encompassing northern Oklahoma and parts of southern Kansas, a second region covering central Oklahoma down to the Oklahoma--Texas border, and a third region encompassing the Dallas--Fort Worth area of Texas . </P> <P> On April 21, 2015, the Oklahoma Geological Survey abandoned its skepticism of the possible link between earthquakes and industrial activities and said in an official statement that it "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 ." In 2013, the seismicity rate was "70 times greater than the background seismicity rate observed in Oklahoma prior to 2008", potentially although unlikely explainable by natural variations in seismicity, but the seismicity rate by the time of the statement was "about 600 times greater than the background seismicity rate" and was "very unlikely the result of a natural process ." </P> <P> Late on August 16, the number of earthquakes in Oklahoma with moment magnitudes of ≥ 3.0 for the year of 2015 surpassed the yearly total for 2014 of 585 such earthquakes with over six times as many M 3.0 + earthquakes as California . Through August 19, Oklahoma average 2.5 M 3.0 + earthquakes a day in 2015; if earthquakes were to continue to occur at this rate through the remainder of 2015, Oklahoma would total over 912 such earthquakes, an increase of over 55% as compared to 2014 . </P> <P> On December 29, a magnitude 4.3 earthquake struck in northeastern Oklahoma County near the town of Edmond . The quake caused structural damage to at least one home and caused power outages to over four thousand residents . This was followed by a 4.2 magnitude earthquake on the morning of January 1, 2016, again in northeastern Oklahoma County in a nearby area . Then on January 6, two earthquakes - one of magnitude 4.4 and one of magnitude 4.8 - struck near Fairview in northwest Oklahoma within just 30 seconds of each other . On February 13, slightly over five weeks later, an earthquake with an estimated magnitude of 5.1 struck 28 kilometers (17 miles) northwest of Fairview . It was the third - strongest earthquake ever recorded in Oklahoma at the time it occurred . </P>

When was the last time there was an earthquake in texas