Mysterious Loud Boom And Rattling Felt Along Orange And San Diego County Coastlines Early Monday Morning
Some residents said they thought it was an earthquake, while others believed it was possibly a sonic boom.
Watch CBS News
Some residents said they thought it was an earthquake, while others believed it was possibly a sonic boom.
A shudder felt across most of Southern California wasn't an earthquake – it was a sonic boom, according to the U.S. Geological Survey.
