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A day after a 6.0 magnitude earthquake rocked a wide swath of northern California, residents of Southern California were shaken on Friday morning.
But what some thought was another earthquake turned out to be a sonic boom that was recorded around 9:20 a.m., according to the US Geological Survey.
The sound energy explosion occurred about a mile south of San Dimas, the USGS reported. But the effects spread to the coast, where several people said they felt an earthquake-like rumble.
A sonic boom is a thunderous sound that can be heard when a plane flies faster than the speed of sound, according to NASA.
“A lot of people say they felt it, but the seismograms clearly show that the earth was not moving, only the air,” said Lucy Jones, an earthquake expert. in a tweet. “So it was a sonic boom.”
According to the USGS, seismologists can detect a sonic boom when it is felt over a large area, indicating a large earthquake – except that seismic instruments do not register the disturbance as an earthquake.
Residents from Huntington Beach to Highland Park reported feeling their house shaking, the ground rumbling and hearing a loud sound.
You can report if you have felt the sonic boom to the US Geological Survey.
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