If you felt a big jolt on the western slope last night, you weren't alone. An earthquake struck near the town of bedrock.

The earthquake information center in golden reported the quake registered a magnitude 3.9 on the Richter scale.           

Even though the quake's epicenter was 56 miles southwest of Grand Junction, plenty of folks here said they felt it.

Around 9:45 pm Wednesday night an earthquake shook things up in the town of Bedrock, sending a jolt out to areas as far away as the Grand Valley.

A Grand Junction resident said, "Mostly it was just like a shaking of a table, and most people didn't realize it was an earthquake. They just thought there was maybe some ice sliding off the roof."

"I was a little before 10, I was in bed but he mentioned he felt something rumbling just a little bit. My step-son said the same thing. That he felt something," said another Grand Junction resident.

"It felt like the building was going to fall over or something," said Brian Sloan.

Eric Johnson, a resident of the small western Montrose county town, says he's felt about ten earthquakes in the area, but this one was the most powerful. Causing much more shaking than what folks in the Grand Valley experienced.

Johnson explained, "All of sudden it was almost like an explosion or something, the house shook very hard. The doors all opened up, every door just popped open. We heard this really loud crack sound. We actually thought the house was going to fall in, we saw the walls move."

Johnson said he believes the cause of the earthquake was a nearby deep well injection - a liquid waste disposal technology, which uses injection wells to place treated or untreated liquid waste into geologic formations.

"It's very dangerous, there's hydrogen sulfide gas and pressures that can reach five thousand pounds per square inch when they inject."

The federal government says under certain circumstances the increased pore pressure resulting from fluid injection can trigger earthquakes. 

Johnson added, "Earthquakes are intrinsic to them. Most of them are very small, that well though has produced thousands of earthquakes.”

No major injuries or damage have been reported from the quake.

Some bedrock residents we spoke to told us they had cracks in their wall, and many broken items that fell off their shelves.

Earthquake experts say the particular type of bedrock in the Paradox Valley causes ground shaking to be felt over a much larger area, part of the reason some of us felt that unexpected jolt last night.