A 4.0 magnitude earthquake shook Orange County early Thursday morning.
The quake struck about 8 miles northeast of Trabuco Canyon at 2:09 a.m., the United States Geological Survey reported.
The shaking was felt as far away as Lake Hughes, Barstow and San Diego, viewers told KTLA.
The quake was near the Elsinore fault but not on it, Dr. Lucy Jones stated in a tweet.
Jeff P. from Corona said there was a loud rumbling followed by a huge jolt when the quake struck.
No damage or injuries were immediately reported.