Residents from Encinitas east to Escondido and south to La Mesa, Santee and elsewhere in San Diego County reported rattled nerves and shaken buildings after hearing at least one loud boom at about 1:25 p.m. Friday, Feb. 21.

The source of the boom — two in rapid succession, according to several reports — is not known. Social media immediately lit up over the sounds.

The U.S. Geological Survey reported no earthquakes in San Diego County at the time, according to the USGS earthquake tracker.

A Marine Corps Base Camp Pendleton media relations contact told the North Coast Current that no such sounds came from the base’s training ranges at the time residents reported hearing them. Marine Corps Air Station Miramar has not yet responded to an inquiry seeking similar information.

Descriptions of the sound and shaking were best summed up by a local Twitter user in response to the North Coast Current’s call for reports: “Loud crack, house shake, but not earthquake, no swinging of hanging objects.”

(Story updated 2/21/2020 at 2:25 p.m.)

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