A mysterious boom was heard across San Diego at 4.52pm on Wednesday and residents reported feeling shaking for about three seconds, echoin...
A mysterious boom was heard across San Diego at 4.52pm on Wednesday and residents reported feeling shaking for about three seconds, echoing similar incidents last month and last year.
People reported feeling the windows and doors of their homes rattle as the United States Geological Survey said it did not record even a slight earthquake, the San Diego Union Tribune reported.
However, one Twitter user noted that the Southern California Seismic Network, a co-operative project of Caltech and the USGS, recorded what appears to be the boom on a live feed on YouTube of its seismograph.
A mysterious boom was heard across San Diego at 4.52pm on Wednesday afternoon
Residents reported feeling windows and doors shake across the San Diego area on Wednesday
One Twitter user noted that the Southern California Seismic Network, a co-operative project of Caltech and the USGS, recorded what appears to be the boom on a seismograph
The thunderous noise caused other social media users to contemplate what may have caused the sound, with top theories being: fighter jets from the nearby Camp Pendleton military base and stormy weather.
However, the military theory may have been ruled out, the Union Tribune reported.
'That wasn't one of ours,' Cmdr. Zachary Harrell, a Navy spokesman, told the outlet.
Harrell noted that military jets are required to break the sound barrier far off the coast where they would not be heard.
One Twitter user speculated the sound came from artillery rounds at Camp Pendleton.
'Live in Valley Center, North County and assumed it was just a much louder round of artillery at Camp Pendleton. Website says they are doing Mortar Fire all day and I thought I heard some earlier and again this evening,' @scarrcats tweeted.
Officials with Camp Pendleton confirmed to KGTV that soldiers were conducting artillery training on Wednesday but could not confirm if that was responsible for the boom.
The Marines and local defense contractors that operate at Pendleton and other nearby bases did not respond to requests for comment from the outlet.
Some Twitter users speculated that the boom was caused by the nearby Camp Pendleton
One resident tweeted that she thought that the boom was a noisy neighbor moving furniture
Another Twitter user simply surmised 'aliens' after the boom was felt in San Diego on Wednesday
San Diego County Sheriff's Department received calls about the boom but KSWB-TV that they did not know what caused it.
A researcher at the Center of Scientific Research and Higher Education told the Union Tribune that supersonic airplanes could have caused the 'rumble.'
But Humberto Mendoza Garcilazo also suggested it could may have been caused by stormy weather and atmospheric pressure changes, the Union Tribune reported.
National Weather Service meteorologist Brandt Maxwell told the outlet he was skeptical that it was caused by weather.
There were no thunderstorms in the area at the time of the boom and 'even with a strong cold front, you won't get that kind of rumbling,' he told the outlet.
Another Twitter user simply explained: 'Aliens.'
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