Residents of San Diego were baffled as a mysterious reverberation passed through the city – described by some as a door slamming and by others as a force strong enough to rattle their windows.
People living in the sunny California city and surrounding areas worried about the threat of possible earthquakes.
However, according to the U.S. Geological Survey, there has been no seismic activity in the sunny California city in recent months.
The mysterious noise, instead, came from the sonic booms produced by a pair of Navy jets, according to a report.
Though the Navy initially denied the claims, Lt. Aaron Kakiel told U-T San Diego that the F/A-18 jets did a flight demonstration in conjunction with the USS Carl Vinson's family day on Friday.
NBC San Diego said the military action was instead called a ‘skyquake,’ tremors from as many as 50 miles away from the military base’s training actions.
The carrier is 32 miles west of San Diego at sea and Kakiel says the mistake was made because officials originally thought the carrier was much further from shore.
A spokesperson for Camp Pendleton told NBC San Diego that Marines are not doing any unusual training exercises.
The U.S. Geological Survey says it received more than 500 reports from people in San Diego County who felt shaking Friday.