Reactions & Side Effects Of The New Earthquakes To Strike LA - FOX13 News, WHBQ FOX 13

Reactions & Side Effects Of The New Earthquakes To Strike LA

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Los Angeles, CA -

(FOX 11 / CNS) Residents of 20 Fullerton apartments red-tagged after a magnitude- 5.1 earthquake near La Habra on Friday were back home today, while six homes remained red-tagged.

Building inspectors examined cracks in 20 apartments in the 2700 block of Associated Road in northeast Fullerton and determined that foundations were not compromised, and 73 people were allowed to return home Saturday night, according to Fullerton Fire Department Battalion Chief John Stokes. "Most cracks are cosmetic, caused by the movement of structures,'' according to Stokes.

Carbon Canyon Road in Brea was reopened after Caltrans workers made sure no more  rocks were in immediate danger of sliding into the road, Stokes said. The U.S. Geological Survey reported that a series of aftershocks rumbled through the area on Saturday. One was magnitude-3.4, centered about a mile south of La Habra, at 9:02 a.m. Another one, magnitude 4.1, was centered about one mile southeast of Rowland Heights at 2:32 p.m. A magnitude 3.3 earthquake hit at 10:51 p.m. one mile south-southwest of La Habra, and a magnitude 3.1 aftershock, at 11:17 p.m., was centered one mile south-southeast of La Habra.

No serious injuries were reported as a result of the earthquake on Friday, which struck at 9:09 p.m. and ruptured water mains and gas lines, damaged homes and businesses, sent store merchandise crashing to the floor and caused a rockslide in Brea.

The quake caused three major water main breaks in Fullerton and another four minor leaks at residences and businesses in the city, Stokes said. Authorities were also inspecting apartment buildings in La Habra, where as many as 50 residents spent time Friday night at a Red Cross shelter in the community center after self-evacuating from their homes. The shelter closed
this morning.

The earthquake on Friday struck at a depth of five miles and was preceded by a magnitude 3.6 quake in the area at 8:03 p.m., according to the USGS.

It was felt from the Mexico border to the Central Valley in at least seven Southern California counties, including Los Angeles, Orange, Riverside, San Bernardino, San Diego, Ventura and Kern.

The temblor was estimated to be about 10 times larger than the March 17 magnitude 4.4 quake near Encino in terms of energy released, Jones said. The March temblor struck early on a Monday morning. This one, 12 days later, was a reminder to the community, to be prepared, Mayor Eric Garcetti said.

"L.A. residents can visit readyla.org for guidance on how to best prepare for the next earthquake, including potential aftershocks,'' Garcetti said.

The earthquake struck about five miles to the northwest of the magnitude-5.4 Chino Hills earthquake of 2008, said U.S. Geological Survey seismologist Robert Graves. According to Jones, the fault that caused the earthquake was close to, but separate from, the Puente Hills thrust (fault) that was responsible for the 1987 Whittier Narrows earthquake, which registered a magnitude 5.9, killed eight people and did hundreds of millions of dollars in damage.

"There is no definitive information on the fault,'' Jones said. "There are several active faults in that region that have been mapped.'' Jones said her preliminary research indicated the fault was last active on July 8, 1929.

Though seismologists have yet to pinpoint the fault system behind Friday's main event, the Puente Hills fault could unleash a powerful quake that would radiate its energy out of northern Orange County, through the San Gabriel Valley and downtown Los Angeles, into Hollywood.

Experts told the Los Angeles Times magnitude-7.5 temblor on the fault could cause hundreds of billions of dollars in damage and kill 3,000-18,000 people.

Graves said the experimental early warning system being developed by Caltech gave four seconds notice of the impending temblor. "The system worked as it was supposed to work.'' Graves said.

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