The quake initially registered as a 3.0. The USGS later downgraded the magnitude to 2.9.
It hit around 1:24 p.m. approximately 1.2 miles south of Buena Park, 2.5 miles east of La Palma and 4.3 miles west southwest of Fullerton, according to the USGS.
Eyewitness News viewers reported feeling the temblor in Fullerton.
There were no immediate reports of damage or injuries.
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DEVELOPING...We will add more details to this report as they become available.