A sonic boom hits Southern California after the Sierra Nevada earthquake

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A day after a 6.0-magnitude earthquake struck a wide area in Northern California, Southern Californians were in for a shock Friday morning.

But what some thought was another earthquake that turned out to be a sonic boom was recorded around 9:20 a.m., according to the US Geological Survey.

The US Geological Survey reported that the acoustic energy explosion occurred one mile south of San Dimas. But the effects extended towards the coast, where many people reported feeling an earthquake-like tremor.

A sonic boom is a thunder-like noise that can be heard when a plane flies faster than the speed of sound, according to NASA.

“Lots of people have reported feeling it, but seismograms clearly show that the Earth isn’t moving, only the air,” seismologist Dr Lucy Jones said in a tweet. “So it was a sonic boom.”

According to the United States Geological Survey (USGS), one of the ways seismologists can detect a penetrating sound is when it is felt over a wide area, indicating a large earthquake—except for seismic instruments that don’t record the disturbance as an earthquake.

Residents from Huntington Beach to Highland Park reported that they felt their home shudder, the ground rumbled and they heard a loud screeching sound.

You can report to the USGS whether or not you have felt the sonic boom.

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