TAFT, Calif. -- An investigation into extension cords all over Taft led to a company looking for oil.

PGS Onshore has been in Taft since February of this year and will probably be there until December. They also plan on finding oil.

The company has been using 65,000-pound trucks called "thumpers" that use massive metal platforms that slam into the ground and create signals that can detect oil. The signals are sent back to the electrical cords.

Although the discovery of oil could mean good economic news for the city of Taft, some residents aren't welcoming PGS Onshore with open arms.

"All of a sudden the house started shaking like an earthquake. Just crazy," said one resident who spoke on condition of anonymity. "After they left, I started looking around and I noticed, gosh, the driveway's lower in one area, and then I notice the new crack that went up to the garage door. I noticed the new crack going all the way to the sidewalk."

Other residents claim that items were broken after the truck's vibrations knocked things off their walls.

Dick Merchant, the project manager for PGS Onshore, denied that the company is at fault and says that tests were done to ensure no damage would be done.

He said anyone with a complaint can contact their company at (877) 333-9385 and get in touch with PGS' insurance company.