Oklahoma experiences seven earthquakes, the largest is a magnitude 4.3. The earthquakes originate about five miles from the surface of the Earth.
Earthquakes are going to be a normal part of everyday life in Oklahoma. They are going to become more and more a part of life there.
The USGS records five earthquakes, four of them a magnitude 3 or greater. The largest, a magnitude 3.1, has an epicenter near Crescent in Logan County. Three magnitude 3.0 quakes are recorded near Enid, Stillwater and Chandler, while a 2.5 magnitude quake hits near Stillwater in Payne County. This brings the total number of earthquakes recorded over the past month to 102. Oklahoma has had 183 earthquakes, magnitude 3 or more, recorded between October 2013 and April 14, 2014.
The USGS says the rate of earthquakes in Oklahoma has increased by about 50 percent, significantly increasing the chance for a damaging magnitude 5.5 or greater quake:
While it’s been known for decades that Oklahoma is ‘earthquake country’, we hope that this new advisory of increased hazard will become a crucial consideration in earthquake preparedness for residents, schools and businesses in the area. Building owners and government officials should have a special concern for older, unreinforced brick structures, which are vulnerable to serious damage during sufficient shaking.
According to the USGS and the Oklahoma Geological Survey, statistical analysis shows that the quakes aren’t just a normal variation. Waste water injection is a likely contributing factor. The OGS has also increased the number of seismic stations.