(ETH) – For the third time since February, a mysterious boom was heard and shaking felt Tuesday night by residents across San Diego County.

The latest mystery phenomena — sometimes referred to as a sky quake — was reported just before 8:20 p.m. by residents as far south as Tijuana, as far east as El Cajon, and in San Diego neighborhoods in the southeast and coastal areas, as well Linda Vista, Clairemont, and Tierrasanta. A similar incident shook the region on Feb. 16.

At the time, the United States Geological Survey tweeted that the shaking wasn’t an earthquake “but it may have been a sonic boom which are not too uncommon” in San Diego. About three weeks later, on March 10, residents across the region again reported a similar shaking and loud boom, though no earthquakes were reported.


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On Tuesday night, the USGS website again showed no seismic activity in the region. While the two previous mystery shaking events occurred within 10 minutes of 5 p.m., Tuesday night’s incident occurred after the sun had set.

A few minutes later, San Diego police received several calls regarding the noise and shaking, according to Sgt. Kevin Gibson. One caller reported hearing what they thought was someone on their roof, though dispatchers and officers believed it was likely related to the mysterious shaking, according to police radio traffic. READ MORE