WHATS IN THIS BLOG: • Where was the earthquake? • Were there after-shocks in that area? • What causes earthquakes in Oklahoma? • To find out more about fracking and earthquakes.
EARTHQUAKES HAVE BEEN DECLINING IN OKLAHOMA, since the Oklahoma Corporation Commission issued a plan in February 2016 to cut volumes of saltwater disposal by 40% in a large area north-west of Oklahoma City. However, that area did not include the spot just a little east of the north-south line between Stillwater and Ponca City, near Ralston and Pawnee.
This morning, Saturday 3 September 2016, in a small area (but larger than the red dot), an equal largest-ever earthquake of magnitude M = 5.6 occurred at 7:02 am and was followed in the next 3.5 hours by five post-shock tremors of magnitude 3.1 to 3.6.… More