An aftershock measuring 5.7 magnitude was felt Change_sentiment on January 15 , an event not widely reported Reporting outside the country until after the February quake , which initially was assessed by the USGS at 5.7 magnitude as well .

According to the United States Geological Survey ( USGS ) , it was the most powerful earthquake Catastrophe ever recorded Recording in Oklahoma ; this record Recording was surpassed Cause_change_of_position_on_a_scale by the 2016 Oklahoma earthquake .

In March 28 , 2016 the USGS released the USGS National Seismic Hazard Map which concluded Statement that the primary cause Causation of the earthquake Catastrophe in Oklahoma in 2011 was pressure on fault lines from cumulative effects of injecting Filling oil drilling Action wastewater under high pressure into the underground .

In March 28 , 2016 the USGS released the USGS National Seismic Hazard Map which concluded Statement that the primary cause Causation of the earthquake Catastrophe in Oklahoma in 2011 was pressure on fault lines from cumulative effects of injecting Filling oil drilling Action wastewater under high pressure into the underground .

According to the United States Geological Survey Scrutiny ( USGS ) the cities experiencing Perception_active the strongest shaking—VIII ( `` Severe '' ) on the Mercalli intensity scale ( MM ) —were Concepción , Arauco and Coronel .

It was measured at M 5.9 by the United States Geological Survey ( USGS ) and M 6.0 by the European Alert System .

Another strong quake Catastrophe occurred Coming_to_be about one hour later , measured at 5.6 magnitude by the USGS .