Yale Environment 360: Hydraulic fracturing and underground wastewater disposal may trigger earthquakes at tens of kilometers from the wells in which water is injected a greater range than previously thought, according to new research from seismologists. In one case, an earthquake swarm in Oklahoma has been linked to a cluster of fracking injection wells up to 50 kilometers (31 miles) away, Cornell University researchers report. So-called "induced seismicity" when human activity causes tremors in the earth's crust...