Big earthquakes have come back okeydokey land.
There is no harder correlation than between the price of natgas and earthquakes in OK. There is even good physics, which is unusual with correlations.
This was a 'pure extension' earthquake, which has low ground motion compared to magnitude. However, it will soon be accompanied by its +1 of a shallow thrust. That's the giant mechanism they're tickling here.
ps. AssPrat would be happy to negotiate a reasonable solution for their problem.