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.
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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.