An earthquake that struck northeastern B.C. on Thursday evening was "very likely" caused by fracking, a preliminary investigation has found.

Earthquakes Canada said the quake had a preliminary magnitude of 4.5, with the epicentre about 16 kilometres southwest of Fort St. John.

The epicentre coordinates from Earthquakes Canada:

It hit around 5 p.m. PT, followed by another tremor of similar magnitude, classified as an aftershock, less than an hour later.

The Geological Survey of Canada and the B.C. Oil and Gas Commission launched an investigation to figure out what caused the tremor.

EARTHQUAKE Mag=4.5 on 29 Nov at 18:27 MST.<br><br>Details : <a href="https://t.co/v9hU3lptAX">https://t.co/v9hU3lptAX</a><br><br>16 km SSW of Fort St. John, BC —@CANADAquakes

On Friday, a statement said they had confirmed there was active fracking happening near the epicentre when the quake struck.

"The likelihood this was induced … there's a very high correlation," said Honn Kao, seismology research scientist with the Geological Survey of Canada.

Kao stressed the link was a preliminary finding and more investigation is required before the agency confirms the quake was "100 per cent" a result of fracking — but said it's "very likely" that's the case.

Hydraulic fracturing — or fracking — is the process of injecting water, sand and other chemicals underground at a very high pressure to fracture shale rock, in order to extract natural gas.

Western Alberta and northeast B.C. have a high rate of fracking-induced earthquakes, according to a study from the University of Alberta.

Tremor 'lightly felt'

People in Fort St. John, as well as Taylor, Chetwynd and Dawson Creek, reported feeling the earthquake on social media, but there are currently no reports of damage.

We had an earth shaking start to the Beginning Band Concert but the show went on! <a href="https://twitter.com/hashtag/yxj?src=hash&ref_src=twsrc%5Etfw">#yxj</a> <a href="https://twitter.com/hashtag/sd60?src=hash&ref_src=twsrc%5Etfw">#sd60</a> <a href="https://twitter.com/hashtag/fortstjohn?src=hash&ref_src=twsrc%5Etfw">#fortstjohn</a> <a href="https://t.co/DtAEyUNcIF">pic.twitter.com/DtAEyUNcIF</a> —@sd60

My couch and bookshelf shook... sent the cats running! —@aleishahendry

Kao said early data suggests the quake had a relatively shallow depth, which is likely why the quake was widely felt.

"This is certainly an event that has been felt quite a bit by the local residents," Kao said. "Although this is a significant event for the region, I don't think it's going to cause significant damage."

According to the U.S. Geological Survey, the quake had a preliminary magnitude of 4.2.

With files from Johanna Wagstaffe and Rhianna Schmunk