A mysterious boom heard around San Diego was probably from a supersonic aircraft on a training mission... Supersonic Aircraft Tracked Off San Diego Coincided With Mysterious "Skyquake" - There are strong indications that a mysterious boom heard in and around San Diego was from a supersonic aircraft on a raining mission off the coast.
esidents of San Diego County in South California, as well as other nearby areas, heard and felt at least one loud boom late yesterday. The U.S. Geological Survey did not detect any earthquake activity at the time of this incident, which occurred at around 8:20 PM local time on June 8th, 2021, and that some are referring to as a "skyquake." There are strong indications that this was a sonic boom and flight tracking data available online does show an unidentified plane flying at supersonic speeds off the coast in a general area that regularly hosts military training exercises, among other military aviation activity, at around the same time. A U.S. Navy supercarrier was also training in the area yesterday.
The San Diego Union-Tribunehas reported that people were talking about hearing and feeling the boom in areas as far east as El Cajon, a city in San Diego County, around 17 miles inland from the Pacific coastline, and as far as south as Tijuana, just over the border in Mexico. KMFB-TV, a local CBS affiliate in San Diego, said that the U.S. Geological Survey (USGS) had recorded a minor earthquake, which is not common in the region, at around 5:37 PM local time, but nothing at around 8:20 PM.
Online flight tracking data available through ADS-B Exchange shows an unidentified aircraft flying off the coast of San Diego, as well as Baja, at altitudes between 20,000 and 25,000 feet, last night. The data shows a recorded speed of 967 knots at 8:27 PM, certainly fast enough to produce a sonic boom at the altitudes in question. The proximity of the track to the shore also lends credence to the boom and associated shockwave being heard and felt across the San Diego County Area. It's certainly important to also note that the Nimitz class carrier USS Carl Vinson was operating in the area yesterday. The ship had left San Diego two days earlier and returned off the coast today.
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