SANTA MONICA—An earthquake with a magnitude of 4.6 struck in the San Gabriel Valley area on Friday, September 18, and tremors were felt as far as Santa Monica.

According to the United States Geological Survey (USGS), the earthquake was centered less than two miles west-southwest of South El Monte at 11:38 p.m., with a recorded depth of around 10 miles. The quake was initially estimated to be at a magnitude at 4.8, then downgraded to 4.6 and later to 4.5.

The Los Angeles Fire Department tweeted to alert residents to be prepared for aftershocks. If inside the house when tremors are felt, as a precaution they asked people to, “DROP, COVER, HOLD ON!”

In addition, the LAFD asked the public to protect their head and neck and take cover under sturdy furniture or near a sturdy interior wall. Officials from the LAFD asked individuals to stay, “Away from Windows and Doorways Until Shaking Stops.”

People took to Twitter to discuss their experiences and shared tips on preparedness using  apps that provide early earthquake warnings.

“It was really loud before the shake and roll in the South Bay,” said another user on social media about their experience.

“Google it and you’ll find there’s an Android and iOS app links off Berkeley’s web site#earthquakeEarlyWarning #earthquake,” tweeted a user.

“Please carefully inspect your home for damage, including any natural gas or water leaks, and use flashlights – not candles – if necessary, for light,” the LAFD said.

There were no reports of any injuries during the incident.