I am not a geologist and I don't even play one on TV, but this has been my take on this from the start:
(For the sake of the following point, we're assuming that there is a connection between fracking and earthquakes - a point I'm not convinced has been proven, but of course it's possible.)
Earthquakes are simply stress relief in the crust. This crust is moving and stress is going to build and then be released. The stress itself is not man made. Anything man can do to lubricate the crust and make it build up less stress would be a good thing, not a bad thing. If fracking causes quakes to be small and numerous rather than large and devastating, that would be a good thing.
Lubrication can't make an earthquake bigger -- only smaller.
But what do I know?
JB
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