But what some thought was another quake turned out to be a sonic boom that was recorded about 9:20 a.m., according to the U.S. Geological Survey. But the effects rippled out toward the coast, where several people reported feeling an earthquake-like rumble. A sonic boom is a thunder-like noise that can be heard when an aircraft flies faster than the speed of sound, according to NASA. Residents from Huntington Beach to Highland Park reported feeling their house shudder, the ground rumble and hearing a loud sound. You can report whether or not you felt the sonic boom to the U.S. Geological Survey.

Source: Los Angeles Times July 09, 2021 19:30 UTC