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No major injuries or damage were reported following the quake, which struck at 11:42 a.m. (1842 GMT) near Chino Hills, 33 miles (50 kilometers) east of Los Angeles at a depth of 7.6 miles (12 kilometers), the US Geological Survey said.
Buildings across the region swayed and shuddered, and many offices evacuated workers as a precaution following the quake.
The quake, which was followed by some 27 minor aftershocks, rippled across California and Nevada, rattling city officials in San Diego, tourists in Disneyland and residents as far east as Las Vegas, officials said.
California Governor Arnold Schwarzenegger said the region had been lucky to avoid a major disaster.
"Thank God that there have not been any reports of serious injuries or damage to properties," Schwarzenegger said. "This reminds us once again that in
Henry Renteria, the director of
"But luckily, I think we dodged a bullet here, and have not seen any major issues with this event," Renteria told reporters.
USGS official Kate Hutton said the quake would serve as a useful wake-up call for Californians who had become blaze about the dangers of a large-scale incident.
"People have forgotten what an earthquake feels like. We should look at this as an earthquake drill for the Big One that will come one day," she said.
Television images showed buildings swaying and cans and bottles tumbling from store shelves. Startled litigants interrupted the taping of the program "Judge Judy" as the mock courtroom shook.
Greuel said officials had reacted calmly after the quake disrupted a city council meeting. "There was not any trauma or running out," Greuel said. "Had it gone a little longer I think we all would have gotten under our desks."
Officials at
Emergency services near the epicenter of the quake in Chino Hills confirmed they had received no reports of injuries or damage.
"We felt the shock and our crews began patrolling the area for damage," said Chino Valley Fire District captain Jeremy Ault. "Our reports say there is no major structural damage or injuries."
Robert Rosales, a truck driver from 0ntario, near Chino Hills, said the quake had jolted him up and down.
"The first thing I thought was This is a strong earthquake. I’ve lived here all my life. It went on a long time. It was up and down, then back and forth," Rosales said.
Margarita Melo, a 29-year-old office worker in
Phone services were "maxed out" in the immediate aftermath of the quake, the California Office of Emergency Services said, as people scrambled to phone friends and family.
Geologists say an earthquake capable of causing widespread destruction is 99 percent certain of hitting
A study published earlier this year said a 7.8 magnitude quake could kill 1,800 people, injure 50,000 more and damage 300,000 buildings.
A 6.7 earthquake in Los Angeles in 1994 left at least 60 people dead and did an estimated 10 billion dollars damage, while a 6.9 quake in San Francisco in 1989 claimed 67 lives.