For at least the third time in 2021, occupants of homes and businesses in San Diego were startled late Tuesday morning by an unexplained, abrupt shaking. According to NBC San Diego, Residents reported feeling the brief, violent shake at 11:36 in the Mission Hills and San Carlos neighborhoods of San Diego, as well as in Santee and El Cajon in East County.

Shortly after the jarring incident, many San Diegans took to Twitter and other social media platforms. One person tweeted out that “San Diego is cool bc I’m like oh wow just felt an earthquake but no actually it was a sonic boom.” Another tweeted, “I’m just logging in to confirm if that really was an earthquake or if I was losing my mind lmao.

San Diego acting real sus right now, quaking while it’s raining.” Official confirmation of the incident was slow in coming, but an official with the United States Geological Society said that there no quakes locally at that time. Spokesman Robert DeGroot said USGS sensors did not detect anything seismic activity at that time.

Representatives for San Diego Sheriff’s and San Diego Police said Tuesday morning that they had not received any calls reporting the incident, and the National Weather Service said they were unaware of anything that might have caused the event. NBC 7 put in a request for a statement with officials at Marine Corps Air Base Miramar and received the following reply:

“MCAS Miramar does not have the ability to track aircraft outside of its immediate airspace directly in and around the base. The FAA is the federal agency responsible for monitoring flight throughout San Diego and would best be able to answer your query.” NBC 7 asked the FAA if it could confirm whether any aircraft, military or otherwise, was operating at speeds in or around San Diego County at the time that could cause such an event? READ MORE