Filed by Ben Allen in Feature.
February 1, 2013

The number, and intensity, of earthquakes in Oklahoma has risen in recent years. Some point to more natural gas and oil drilling activity, whether its the process of fracturing shale rock far underground (known as “fracking”), or injecting fluid into areas underground (which has been done for decades).

StateImpact Oklahoma examined the issue in a three part series over the past month.

First, an overview of the state’s seismic history. What are the facts, and how have they changed over these past couple years?

So where does oil and natural gas fit into the conversation?

And they wrapped things up with the difficulty facing scientists as they try to determine what is causing the rise.