Home / AMERICAN NEWS / Over 100 Aftershocks in Southern California after 5.1 Earthquake near Los Angeles

Over 100 Aftershocks in Southern California after 5.1 Earthquake near Los Angeles

(AP) A magnitude-5.1 earthquake centered south of Los Angeles shook residents throughout Southern California and sent bottles and cans tumbling off shelves in stores, produced a rock slide that closed a road and forced a brief shutdown of rides at Disneyland.

5.1 Earthquake Los Angeles

@Brea PD tweeted this photo on March 28, 2014, “Rockslide caused car to overturn. Minor injuries. Carbon canyon closed between Valencia and county line.”

In the Orange County city of Fullerton, 20 apartment units and half a dozen homes were red-tagged because of damage, displacing 83 people, police Lt. Mike Chlebowski said.

Southern California Edison reported power outages to about 2,000 customers following the quake.

The tremor struck at 9:09 p.m. Friday and was centered near Brea in Orange County, about 20 miles southeast of downtown Los Angeles, at a depth of 5 miles. It  was felt as far south as San Diego and as far north as Ventura County, according to citizen responses collected online by the U.S. Geological Survey.

More than 100 aftershocks followed, including a magnitude-3.4 that hit Saturday morning.

Broken glass, gas leaks, water main breaks and a rock slide were reported near the epicenter, according to Twitter updates from local authorities.

Tom Connolly, a Boeing employee who lives in La Mirada, said the quake lasted about 30 seconds. “We felt a really good jolt. It was a long rumble and it just didn’t feel like it would end,” he told The Associated Press by phone. “Right in the beginning it shook really hard, so it was a little unnerving. People got quiet and started bracing themselves by holding on to each other. It was a little scary.”

Hall of Fame baseball announcer Vin Scully was on the air calling the Angels-Dodgers exhibition game in the sixth inning at Dodger Stadium.

“A  little tremor here in the ballpark. I’m not sure if the folks felt it, but we certainly felt it here in press box row,” Scully said. “A tremor and only that, thank goodness.”

Public safety officials said crews were inspecting bridges, dams, rail tracks and other infrastructure systems for signs of damage. The Brea police department said the rock slide in the Carbon Canyon area caused a car to overturn, and the people inside sustained minor injuries.

Callers to KNX-AM reported seeing a brick wall collapse, water sloshing in a swimming pool and wires and trees swaying back and forth. One caller said he was in a movie theater lobby in Brea when the quake struck and said people ran outside and hugged in the street.

Rides were halted at Disneyland in Anaheim, but  no  damage  was found and the theme park  was  expected to have normal operations Saturday

Friday’s  quake hit a week after a pre-dawn magnitude-4.4 quake centered in the San Fernando Valley rattled a swath of Southern California. That jolt shook buildings and rattled nerves but did not cause significant damage.

Friday’s “earthquake is the second in two weeks, and reminds us to be prepared,” Los Angeles Mayor Eric Garcetti said in a statement.

Southern California has not experienced a devastating earthquake since the 1994 magnitude-6.7 Northridge quake killed several dozen people and caused $25 billion in damage.

Tectonic Summary (http://earthquake.usgs.gov)

A M5.1 earthquake occurred at 9:09pm on March 28, 2014, located 1 km (1 mile) east of La Habra, CA, 5 km (3 miles) north of Fullerton, CA and 33 km (21 miles) ESE of Los Angeles. The depth of the event is 7.5 km.

The event was felt widely throughout Orange, Los Angeles, Ventura, Riverside, and San Bernardino counties.  It was preceded by two foreshocks, a M3.6 at 8:03pm and a M2.1 at 8:16 pm.

There have been 38 aftershocks as of 10:45pm, the largest of which was a M3.6 at 9:30pm, and was felt locally near the epicenter. The aftershock sequence may continue for several days to weeks, but will likely decay in frequency and magnitude as time goes by.

The maximum observed instrumental intensity was VII, recorded in the LA Habra and Brea areas, although the ShakeMap shows a wide area of maximum intensity of VI. The maximum reported intensity for the Community Internet Intensity Map (Did You Feel It?) was reported at VI in the epicentral area.

This sequence could be associated with the Puente Hills thrust (PHT).  The PHT is a blind thrust fault that extends from this region to the north and west towards the City of Los Angeles.  It caused the M5.9 1987 Oct. 1 Whittier Narrows earthquake.

Previously, the M5.4 2008 Chino Hills earthquake occurred in this region.  It caused somewhat stronger shaking in Orange County and across the Los Angeles Basin.

The moment tensor shows oblique faulting, with a north dipping plane that approximately aligns with the Puente Hills thrust.

The demonstration earthquake early warning system provided 4 second warning in Pasadena.

 

Over 100 Aftershocks in California after 5.1 Earthquake near Los Angeles

About Jordanna

From San Diego, California. "Good news is rare these days, and every glittering ounce of it should be cherished and hoarded and worshiped and fondled like a priceless diamond." -Hunter S. Thompson
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