People from all over El Dorado County say they’re hearing loud booms several times a week, but there are many theories on what is causing them.
“I thought it was thunder,” said one person.
“It’s definitely not thunder; too consistent. I thought it was just mining,” said another person.
“I always considered them to be sonic booms from flying aircrafts for years,” said Loring Brunius, owner of Sierra Rock Diamond Quarry.
People who live near Pleasant Valley say their days have been interrupted by loud booms, shaking the floor beneath them.