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6.4 magnitude earthquake
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6.4 magnitude earthquake in So Cal felt as far away as Las Vegas

An earthquake with an early measure of magnitude 6.4 hit Southern California, about 150 miles from Los Angeles, on Thursday morning, according to the US Geological Survey. Photo: KTLA

(CNN) — An 6.4 magnitude earthquake, downgraded from an earlier report of 6.6, hit Southern California, about 150 miles from Los Angeles, on Thursday morning, according to the US Geological Survey.

The strongest earthquake to hit Southern California in nearly 20 years prompted one city to declare a state of emergency Thursday and was felt by tens of thousands of people from Las Vegas to Orange County.

The quake was centered near Ridgecrest, a community west of the Mojave Desert and about 150 miles north of Los Angeles.

At least 159 aftershocks of magnitude 2.5 or greater were recorded after the earthquake, according to USGS Seismologist Robert Graves. It is a higher than normal number, but not unprecedented, he said. The largest of them was magnitude 4.6.

Noted seismologist Lucy Jones called it a “robust” series and said there is a 50% chance of another large quake in the next week.

Jones said there is a 1 in 20 chance that a bigger earthquake will hit within the next few days. “It’s certain that this area is going to be shaking a lot today and some of those aftershocks will probably exceed magnitude 5.”

Jones said the quake, named the Searles Valley Quake, was preceded by a magnitude 4.2 foreshock.

Power out in 100 degree temperatures

Ridgecrest has announced a state of emergency, Mayor Peggy Breeden said. As the mayor spoke to CNN earlier in the day, an aftershock interrupted the interview.

6.4 magnitude earthquake

Cracks in the road are seen near Ridgecrest, California. Photo: Karaleigh Roe

“As I understand, we have five fires,” the mayor said. “We have broken gas lines.”

Footage from Ridgecrest showed firefighters hosing down flames rising from homes.

There were also power outages in the city of 28,000 residents. The forecasted high temperature is 100 degrees Fahrenheit, the National Weather Service said.

In Kern County, at the epicenter, the Fire Department responded to more than 20 incidents relating to the earthquake and aftershocks, including fires and medical emergencies, according to a tweet on its verified account.

Kern County Fire also tweeted that Ridgecrest Regional Hospital was being evacuated.

April Rodriguez was at home in Trona when she felt a smaller quake followed by a larger one “that didn’t stop,” she told CNN.

“We were panicked trying to get out of the house because everything is falling out of the cabinets, off the shelves, off the walls. … They were flying like missiles off the shelves.”

Kimberly Washburn was directing a children’s July Fourth program in Ridgecrest when the earthquake shook the building, starling the 65 children on stage.

With their parents in the auditorium seats, the kids began screaming.

“It was terrifying,” she said.

One boy was injured when something fell on his foot, but Washburn said they were blessed that more weren’t hurt. After they evacuated, a wall fell behind where the children had been performing, she said.

In LA the ground rolled

In Los Angeles, the main temblor was felt as a long, rolling quake, and buildings rocked back and forth. Many in the city noted how much longer this earthquake felt than most.

Filmmaker Ava DuVernay tweeted, “Been living in Los Angeles all my life. That was the longest earthquake I’ve ever experienced. Not jerky. Smooth and rolling. But it was loooong. It was so long I thought for the first time ever, ‘Is this the big one?’ Damn. Respect Mother Nature. She’s the boss.”

The National Weather Service tweeted that the earthquake was also felt in Las Vegas.

It was the largest quake to hit Southern California since 1999, when a 7.1 earthquake struck in a remote part of the Mojave desert.

In 1994, at least 57 people died when a 6.7 earthquake hit the Northridge neighborhood of Los Angeles, causing $25 billion in damage.

Other reports of damage

Trona, an unincorporated community, “sustained varying degrees of damage” but no injuries have been reported, according to San Bernardino County Fire’s verified Twitter account.

The department reported “minor cracks (in buildings); broken water mains; power lines down; rock slides on certain roads” in northwestern communities in the county.

Dorothea Smith said boulders fell down hillsides, shattering the asphalt and blocking mountain roads.

“There is no going in or out of Trona right now. We’re like stuck.”

Highway 178 has a 4-inch crack, said San Bernardino County Fire spokesman Jeremy Kern. All highways in San Bernardino County remain open. The area’s high tension power lines are all intact.

6.4 magnitude earthquake

Items were knocked off grocery shelves at a Vons supermarket in Lake Isabella, California. Photo: Cathy Perfect

Diane Ruggiero, general manager of the Hampton Inn and Suites Ridgecrest in Ridgecrest, told CNN’s Paul Vercammen that the hotel sustained significant damage.

“The chandeliers are still swinging,” she said five minutes after the quake hit at 10:33 a.m. PT. “The floor rippled.”

A woman on Twitter shared video from “My dads liquor store in Ridgecrest (11 miles from the earthquake)

In Lancaster, one Twitter user reported people fleeing a movie theater.

“Felt like we were on a turntable,” user Rudio87 wrote.

Los Angeles International Airport said no damage was reported on runways. “Operations remain normal,” it tweeted.

“We have no reports of damage to any FAA facilities or operational effects from the quake at this time,” FAA spokesman Ian Gregor said.

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