There are strong indications that a mysterious boom heard in and around San Diego was from a supersonic aircraft on a training mission off the coast.

By Joseph Trevithick and Tyler Rogoway June 9, 2021

Residents 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-Tribune has 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.

SNIP