[Island Chris]

It seems like Oklahoma has been even more active than it has been the last year, with larger quakes, including a M4.7 strike-slip quake. The link is to the Summary: if you scroll down there is a very cautious discussion of induced quakes. I suspect this excessive caution has to do with the importance of petroleum/gas there: some are denying the quakes are triggered.

http://earthquake.usgs.gov/earthquakes/e...al_summary

My daughter worked near that quake spring-summer 2014, at Salt Flats, on snowy plover (birds).

Chris