Around 12:20 p.m. Monday, a series of loud booms was heard in many parts of Jefferson City and Cole County. The origin remains a mystery, but an aircraft breaking the sound barrier is considered the most likely cause. Numerous calls were received at the 911 centre. Some reports indicated the noises rocked and shook buildings, but authorities reported no damage being attributed to the booms.
Mysterious shaking rattled the Central Coast late Wednesday morning. It happened around 11:00 and was felt all the way from Santa Maria to Morro Bay. Some said it felt like a small earthquake. Others thought it may be another sonic boom. Caltech and seismic experts at UC Santa Barbara says there was no earthquake in the region during that timeframe, except for a couple small ones in the Paso Robles area. They agree that it was most likely caused by military flight testing.