LOS ANGELES (CBSLA) – A quake over most of southern California was not an earthquake – it was a sound barrier, according to the US Geological Survey.
The sonic boom was felt around 9:20 a.m. Friday over a wide swath of southern California. And although it was not an earthquake, the USGS created an event site for it, suggesting that it was tagged from Huntington Beach to Thousand Oaks along the coast and as far inland as Lake Elsinore.
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Hey SoCal – if you felt or heard anything this morning ~ 9: 20 AM local time that seemed like an earthquake, it may have been a sound barrier – see the event page for more details https://t.co/F1DRFhkt5N and read more at audio bombs here https://t.co/R5kN5LTZ0w.
– USGS earthquake (@USGS_Quakes) July 9, 2021
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Earthquake expert Dr. Lucy Jones said that seismograms clearly showed that the earth was not moving – just the air, suggesting that the source was a supersonic plane over the sea.
The distribution of people who felt the sonic boom from https://t.co/DMc1xgkJo4
strongly suggests that the source was a supersonic aircraft over the sea. pic.twitter.com/tKTXiYWGlz
– Dr. Lucy Jones (@DrLucyJones) July 9, 2021
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It is unclear which aircraft may have caused the acoustic boom.