Ohio Dept. of Natural Resources is reporting that the December 24th quake in south Trumball country Ohio was within 1 mile of a fracking waste water injection well. 100's of last years Arkansas Guy Swarm quakes occurred mostly within a mile of an injection well situated on top of a fault. Recent Oklahoma quakes were 25-30 miles from any fracking waste water injection wells and are likely not connected, while the Mag 5 Virginia quake last year was over 75 miles from any fracking activity.
Business Journal reports:
"Information freshly obtained from the Columbia University scientists, and further analyzed by ODNR geological experts, indicates that an earthquake occurred on Dec. 24 approximately two miles below and within a mile of the injection site,"
Thats the standard I use, 1 mile, Combined with the Arkansas USGS quote "Temporal and spatial relationships". I think the Guy Swarm has become the textbook case for fracking waste water injection wells causing quakes. Over 600 quakes in an 8 month period, over 250 epicenters within a few hundred yards of an injection well that was literally on top of a fault. See the link at the bottom of the diary for detailed information on the Guy Swarm.
WKSU reports
Another earthquake in the Youngstown area has caused the state to shut down a well that’s been taking in millions of gallons of fluid left over from the drilling process called “fracking.”
Natural Resources Director James Zehringer says the state’s top priority is the public’s health and protection of natural resources, and he is not willing to gamble with safety.
The Dallas Fort Worth Airport was hosting fracking waste water injection wells, which were shut down when seismic equipment showed epicenters within one mile of the injection wells. When injection wells in Guy Arkansas were shut down, quake frequency went down from 60 a month to 2 or 3 a month within 4 weeks. Neither the Oklahoma or Virginia quakes last year appear to have any connection to fracking waste water injection activities.
Past experience has shown that once injection wells are shut down it takes at least 2 weeks to as much as a month for the quakes to stop.
Info on Aug, 2011 Virginia quake
http://www.dailykos.com/...
Info on Arkansas Guy Swarm
http://www.dailykos.com/...