SAN DIEGO (AP) - Some San Diego-area residents say they heard a loud boom and felt the ground shake, but there are no reports of earthquake or damages.
The U.S. Geological Survey says it received more than 500 reports from people in San Diego County who felt shaking Friday. The survey maintains an online site where people can report what they felt.
USGS geophysicist Bruce Presgrave says it was most likely a sonic boom.
San Diego police spokeswoman Lt. Andra Brown says three residents called to report the noise, including one in the La Jolla area whose windows rattled about five seconds. One police sergeant said it sounded like a sonic boom.
Miramar Marine Corps Air Station says its jets would not have been traveling fast enough to cause a sonic boom.