Did You Feel the Quake? 5.2 Temblor Strikes in Riverside County

Borrego Springs, CA — A 5.2-magnitude earthquake struck in Riverside County, near the border of San Diego County, early Friday morning and was felt widely throughout Southern California, the U.S. Geological Survey reported.

The quake, which was first reported as a 5.1 but was upgraded to a 5.2, struck at around 1:04 a.m. and was centered about 14 miles north, northwest of Borrego Springs, 15 miles east, southeast of Anza and 15 miles northeast of Warner Springs.

The quake was on the San Jacinto fault, which is historically the most active fault in Southern California, retired USGS scientist Lucy Jones said in a tweet. Friday's earthquake was near the 1937 magnitude 6.0 quake and the 5.3-magnitude quake in 1980, she said.

"Every EQ has a 5% chance of triggering an 'aftershock' that is bigger than itself — always within a few miles of location of 1st EQ," she said in a tweet.

Within 30 minutes of the quake, there were dozens of recorded aftershocks. Most were small, but three were magnitude 3.0 or higher, according to the USGS.

A 3.5 temblor struck at 1:06 a.m., followed by a 3.0 one minute later and a 3.5 at around 1:33 a.m.

The quake was felt as far south as Imperial Beach and as far north as Oxnard and the Antelope Valley. Some people reported on Twitter of being jolted awake by the quake.

As of 2 a.m., there were no reports of injuries. ​The earthquake, however, triggered a minor rockslide on Montezuma Valley Road, about 14 miles southeast of Borrego Springs, the California Highway Patrol reported.​

The quake was considered to be a moderate earthquake, with about 800 or so in the same range happening around the globe each year.

Did you feel it at your house? Tell us in the comments.