Quake Shuts Ohio Injection Wells

CNN:

Ohio Department of Natural Resources Director James Zehringer had announced on Friday that one such well -- which injects "fluid deep underground into porous rock formations, such as sandstone or limestone, or into or below the shallow soil layer," the U.S. Environmental Protection Agency explains -- was closed after a series of small earthquakes in and around Youngstown.
Then on Saturday, a magnitude 4.0 earthquake struck that released at least 40 times more energy than any of the previous 10 or more tremors that had rattled the region in 2011.
Andy Ware, deputy director of Ohio's natural resources department, told CNN on Sunday that Zehringer and Gov. John Kasich subsequently ordered that four nearby injection well projects will not open in the coming weeks, as had previously been planned. They 'll be inoperational until a determination is made in an investigation of a possible link between the earthquakes and the fluid-injection wells, he added.
"They will (not open) until we are satisfied that the process can be safely resumed," said Ware.

These earthquakes around injection wells are curious.  If there isn't any property damage, they might not be a big deal, but if quakes start damaging houses, there's going to be some serious trouble.