Groonk's Newsmine 2.0

Whatever it was, it caused a woman's bed to shake in Lakeside. It created waves in a backyard pool in Carmel Valley. It set off car alarms in Kearny Mesa and rattled windows from Mission Beach to Poway to Vista. At various spots throughout the county, people reported a rumbling sound or a booming noise.

Scientists insist it wasn't an earthquake. The Federal Aviation Administration has no record of any planes producing a sonic boom by breaking the sound barrier.

Camp Pendleton officials say no activities on the Marine base could have created such a disturbance. There were no large explosions in San Diego County that day, and no meteor fireballs were reported in the sky that morning.

What was it, then?

[...]

Among bloggers and Web-based conspiracy theorists, one of the leading explanations for the San Diego disturbance is that the military is testing a top-secret spy plane called the Aurora, which supposedly can travel several times the speed of sound.

“Sir, I've never even heard of that plane before,” an Air Force spokeswoman in Virginia responded when asked about the possibility.

Even UFO experts are baffled by what happened in San Diego. Asked whether a flying saucer might have caused such an event, Peter Davenport of the Seattle-based National UFO Reporting Center said, “Probably not.”

“UFOs almost never generate sonic booms or shock waves,” he added. “They accelerate so rapidly that they leave a vacuum in the sky, much the way lightning does.”