But you guys are pros at the whole shake, rattle, and roll thing, right?

This past Saturday, a 5.6 magnitude earthquake struck the tiny town of Sparks in Lincoln County, Oklahoma. The quake was one of the largest ever recorded in the state’s history, and another example of the sharp increase in seismic activity Oklahoma has experienced in recent years. Up through 2009, Oklahoma had averaged about fifty earthquakes a year. The total number of quakes reported in 2010? 1,047.

This swift and dramatic change in Oklahoma’s vulnerability to earthquakes has some people wondering if the practice of hydraulic fracturing — or “fracking” — might be the culprit. Fracking is the process of injecting highly-pressurized fluids into the earth to break up shale and rock and release otherwise inaccessible sources of natural gas. The waste fluid is then shot back underground at sites called “injection wells.” There are 181 active injection wells in Lincoln County Oklahoma.