A 4.0-magnitude earthquake struck an area of the Santa Ana Mountains straddling Riverside and Orange counties early Thursday, Jan. 25, the U.S. Geological Survey reported.

The temblor hit at 2:09 a.m. at a depth of around 6 miles, with the epicenter described as 10 miles south, southeast of Corona in Riverside County and 8 miles northeast of Trabuco Canyon in Orange County, according to a report by the Southern California Seismic Network, a cooperative project of Caltech and the U.S. Geological Survey to monitor quakes in Southern California.

There were no immediate reports of damages, but hundreds of tweets flooded Twitter after the quake, with people in San Diego, Riverside, San Bernardino, Los Angeles and Orange counties saying they felt it or it shook them awake.

Historic records dating back to 1932 show there have been seven events of a magnitude 4 or greater within 10 kilometers, about six miles, of the quake, according to a seismic network report.

Nearby faults are in the Elsinore fault zone, the zone being an area with numerous faults bearing different geographic names.

Around the time of the quake, both the north- and southbound Temecula Parkway off-ramps from the 15 Freeway in Temecula were closed to traffic due to a construction crew rupturing a gas line, according to CHP logs.

That accidental construction-related incident by the freeway underpass happened at 1:30 a.m.

Many Southern Californians took to social media to share that they had felt the shaker.

This morning’s M4.0 near Trabuco Canyon is near Elsinore fault but not on it. Mechanism shows that it moved on an east-striking thrust fault. Many small quakes are on on small faults, too small to be mapped — Dr. Lucy Jones (@DrLucyJones) January 25, 2018

With no reports of significant damage, public agencies used it as an opportunity to remind people about earthquake preparedness and how to sign up for text or email emergency alerts.

There was a small earthquake this morning in the OC. The quake struck about 8 miles northeast of Trabuco Canyon at 2:09 a.m., according to the United States Geological Survey. Although this was a small tremor, it's a good reminder to be prepared. pic.twitter.com/4kwxBXiGwW — OCFA PIO (@OCFA_PIO) January 25, 2018

Felt the #earthquake in Riverside. — Matthew Swope (@mattswope) January 25, 2018

That was a real #earthquake #SoCal had to be around 4 near #Murrieta — Tony Meyer (@MeyerMeyer0315) January 25, 2018

Pretty sure I just felt an earthquake in San Diego (Santee)…?#SanDiego#earthquake — Zack Gianino 🅥 (@ZackGianino) January 25, 2018

#earthquake in LA / Redondo Beach right now — Alvaro Paiva-Bimbo (@apaivab) January 25, 2018

Just felt a sharp jolt of #earthquake in Inland Empire — Imran Jattala (@ijattala) January 25, 2018

#earthquake felt in pasadena — Calvin S (@Calvinsrule) January 25, 2018

#Earthquake @ 2:10 am felt at Rialto, CA — Omar Palmerin (@hiiOmar) January 25, 2018

#Earthquake here in Seal Beach, CA! Wooo haha it was a nice one — Jacob Rodriguez (@pyrosaxplayer) January 25, 2018

A 4.1 magnitude earthquake occurred 3.11mi NE of Trabuco Canyon, California. Details: https://t.co/jz8XsQYJIV Map: https://t.co/ctbe9OrhH5 — LA QuakeBot (@earthquakesLA) January 25, 2018

Earthquake Warning [Inland Empire, SOCAL] – Primary Wave Detected

GROUND MOVEMENT OCCURRING

Thu Jan 25 02:10:04 2018 #earthquake — DesertQuake (@DesertQuake) January 25, 2018

City News Service contributed to this report.