On Friday evening, Sept. 17, a 4.3-magnitude earthquake shook the greater Los Angeles metropolitan area. There were no initial reports of severe damage or injuries.

According to early information from the U.S. Geological Survey website, the magnitude-4.3 quake struck shortly after 7:58 p.m. Its epicenter was near Carson, about 21 miles southeast of downtown Los Angeles, ABC News reported.

The quake was at a depth of around 9 miles and came after two minor earthquakes with less magnitude in the last week.

“This size happens on average somewhere in Southern California every couple of months,” seismologist Lucy Jones told KCBS-TV. “When it happens to be in the middle of the Los Angeles basin then a lot more people feel it and it becomes bigger news.”

Some people said they felt a jolt that lasted somewhere from a few seconds to ten seconds over the area spreading from Santa Monica, Torrance, and Beverly Hills to the Antelope Valley, an hour north and south of Orange County, and possibly beyond.

When the Marathon Petroleum refinery in Carson lost electricity, it began flaring or burning excess gases, which projected flames into the sky and triggered calls from people worried about the fire.

“Flares are safety devices and the flares are functioning as intended. There are no injuries or off-site impact,” the Los Angeles Times reported.

The Los Angeles Fire Department activated earthquake emergency mode, deploying cars and helicopters to patrol its 470-square-mile (1,217-square-kilometer) area. Still, no reports of “significant damage or injury” had been received, according to a statement from the department.

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