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4.7 Quake Rattles SoCal

An earthquake rattled Southern California on Monday

By Jason Kandel and Chloe Stepney
|  Monday, Mar 11, 2013  |  Updated 8:50 PM PDT
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Seismologists are analyzing a 4.7 earthquake that rattled Riverside County Monday, striking along the San Jacinto Fault. The shaking was felt as far south as San Diego and as far north as Los Angeles. It was centered 16 miles southwest of Palm Desert, near Anza, where many residents felt the quake. Ted Chen reports from Anza for the NBC4 News at 6 p.m. on March 11, 2013.

Ted Chen

Seismologists are analyzing a 4.7 earthquake that rattled Riverside County Monday, striking along the San Jacinto Fault. The shaking was felt as far south as San Diego and as far north as Los Angeles. It was centered 16 miles southwest of Palm Desert, near Anza, where many residents felt the quake. Ted Chen reports from Anza for the NBC4 News at 6 p.m. on March 11, 2013.

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Foreshock Befuddles Early Warning System

The 4.7 earthquake that hit the Anza area Monday proved to be a big test for Cal Tech scientists developing an early earthquake alert system. Initial reports cited the quake was much bigger than it actually was, because of a foreshock that confused the computer system. The USGS early warning system, however, worked without a hitch, giving seismologists a 30-second warning ahead of the temblor. Patrick Healy reports from Pasadena for the NBC4 News at 5 p.m. on March 11, 2013.

Magnitude-4.7 Earthquake Rattles SoCal

A magnitude-4.7 earthquake shook the Coachella Valley on Monday morning just before 10 a.m. A number of smaller quakes hit a short time after. The quake was centered 11 miles east-southeast of Anza and about 16 miles from Palm Desert. Patrick Healy reports for the NBC4 News at Noon on Monday, March 11, 2013.
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A magnitude-4.7 earthquake rumbled on Monday near the Riverside County community of Anza and people reported feeling the temblor up to 100 miles away.

The quake struck at 9:56 a.m. about 13 miles east-southeast of Anza, according to the United States Geological Survey.

At least one smaller quake -- or foreshock -- registered under 3.0. The largest quake was followed by a series of smaller aftershocks that also registered under magnitude 3.0, according to the USGS.

The quake was initially reported at 5.2 magnitude and then downgraded.

The temblor occurred on the San Jacinto fault, one of the more active faults in Southern California, according to the USGS.

Watch: Foreshock Befuddles Early Warning System

There were no initial reports of damage in Riverside County, said Jodi Hagemann of the Riverside County Fire Department.

People reported feeling the quake as far away as Burbank, nearly 130 miles northwest of the epicenter in Anza.

One person in Palm Desert reported a strong quake that flung cupboards open and broke dishes. Dogs were terrified. Another person in Beaumont reported the quake knocked a picture frame off a dresser.

NBC4 Facebook user Terry Raposa said she felt the quake in Lake Elsinore.

"Slam and then felt sea sick! LOL!," she wrote.

Donina Ifurung felt the quake in Glendale.

"I am on the 7th Floor and the building was swaying back and forth," said Ifurung, a communications assistant for DineEquity, Inc.

Users on Twitter reacted to the quake.

"Holy crap there was an earthquake, I thought I was tripping, but they said it on the news," wrote @NuemiReyes.

Twitter user @iamanayeli said the quake woke her up in Riverside.

"At least I won't be late for class!," she wrote.

Twitter user @UWilln3vrBM3 wrote: "My dad felt it in Palm Springs. My son & I felt it in Hemet/Valle Vista area.

Twitter user @giantrobotwar said she was in a classroom and ducked under tables.

NBC Staffer Sharon Bernstein contributed to this report.

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