The days of Spindletop are gone, sadly. Volume wise, is their really much difference between salt water injection and fracking? The water injection has been done for many decades and people, I mean media idiots, seem to think it is something new.
Huge difference, as most saltwater injection is produced water that is many times greater over the life of a well compared to the amount of water used to frack it.
Also there is no fracking currently done in the Arbuckle formation which is a fractured limestone. The wells that are being fracked are in different formations that are a thousand feet or more above the Arbuckle and pose no danger to the faults in the bedrock.
Some of the formations that are currently being drilled horizontally produce high ratios of water to oil and this has lead to increased use of the Arbuckle for disposal because it readily takes water without much pumping which means less energy and less cost.
Much of the older disposal was done in depleted oil wells in formations that do not contact the bedrock.