* Fracking halted temporarily after 4.6-magnitude earthquake near Fort St. John Progress Energy's activities being investigated for links to quake

The B.C. Oil and Gas Commission is investigating the cause of a 4.6 magnitude earthquake earlier this week that triggered the shutdown of a major fracking operation just a few kilometres away.

The earthquake struck on Monday afternoon, some 110 kilometres north of Fort St. John, and was felt in Charlie Lake, Fort St. John and Wonowon.

The earthquake's epicentre was just three kilometres from Progress Energy's fracking site, which the company immediately shut down, even though their activities have not been linked to the quake.

After shutting down, Progress Energy notified the commission of the quake, as it is required to do under B.C. regulations.

Those rules also say fracking must halt if an operation triggers an earthquake greater than magnitude 4.0, and cannot resume until a mitigation plan is put in place.