The earthquake lasted for at least three minutes, and was followed by several aftershocks measuring between 3.2 and 3.9. At 10:30 p.m., an aftershock measuring approximately 4.3 struck about three miles from Ocotillo, which is near Calexico, Calif. About 45 aftershocks registered.
"Probably people will be feeling earthquakes through the night occasionally," said CalTech Seismologist Kate Hutton. "Normally the largest aftershock of a quake, whether it's an aftershock or not, is about one point less than the main shock. So we might have a 4.7 some time. We don't know. It's all statistics."
"In California we always have to be prepared for 'The Big One' because we don't know when it's going to happen," said Hutton.
As of late Monday night, there were no reports of damages or injuries.
Eyewitness News received calls from viewers from all across the Southland, including Rancho Mirage, Yucaipa, San Jacinto, Yorba Linda, Tustin, East L.A., Anaheim, Inglewood and Long Beach reporting the earthquake.
The temblor forced a halt to the Toronto Blue Jays-San Diego Padres game in San Diego.
Earthquake reaction from the social networking world:
An Orange County viewer posted on Facebook: "I felt it in Santa Ana thought my dog was shaking my chair."
A Corona viewer on Facebook posted that she "felt a good roll here in Corona. I have been watching the pool water move with every aftershock."
"It was a rolling here in Laguna. The pool had big ripples in it," someone posted on ABC7's Facebook page.
"We felt it pretty good in South Los Angeles on Slauson & Figueroa. It last about 10 seconds or so, and literally pulsed like the Captain EO attraction at Disneyland," said another person on the ABC7 Facebook page.
An OC woman posted on Facebook: "Felt the rolling boat here in Fullerton. I thought someone was shaking my bed to get my attention while I was listening to music on my iPod. Turned around and yelled what but no one was there."
An Orange County viewer posted on Twitter: "Felt it good and strong here in HB. Long roller."
"I'm from El Centro, everything is okay right now! The quake was strong! We're still getting aftershocks from this!" said another viewer on Twitter.
Another viewer tweeted: "Felt it here in West Covina...rocked the house, made me dizzy."
A La Habra viewer tweeted: "Rolling motion. No fallen items, however."
"Chandeliers and grandfather clock chimes were moving in Carson!" another viewer tweeted.
"We felt it here in Seal Beach. Felt again like a long rolling motion. Kept going on and on..." tweeted a viewer in Orange County.
A Westside viewer tweeted: "Couch moved in West LA around 930 (felt like a wave)."