A 5.1-magnitude earthquake hit the San Francisco Bay Area on Tuesday, according to the United States Geological Survey. No word on injuries or damage.

The quake struck at 11:42 a.m. local time, nine miles east of Seven Trees in the San Jose, Calif., neighborhood. It was followed five minutes later by a 3.1-magnitude earthquake, according to USGS data.

USGS he called him. The “famous quake,” however, described the intensity of the earthquake as weak to moderate. About 18,000 people in the Bay Area and beyond reported feeling the quake, the agency said.

People felt the quake from central California north to Sacramento and Sonoma counties, said Annemarie Baltai, a seismologist. In the video Issued by USGS

“There’s a one-in-a-percent chance of an aftershock greater than magnitude 5 the next day,” she said. “Next week, 10 to 15 aftershocks of magnitude 3 or higher are possible. Shocks of this size and duration are typical for this type of event.

Dr. Baltai said the earthquake occurred on the Calaveras Fault, a branch of the San Andreas fault system.

Lucy Jones, a geophysicist at the California Institute of Technology, said it was the largest earthquake to hit the Bay Area since a 6-magnitude earthquake struck in 2014.

“It’s a once-every-decade-or-so event,” says Dr. Jones, founder of the Dr. Lucy Jones Center for Science and Society.

An earthquake warning system that sends notifications to smartphones gives people at least a few seconds of warning before an earthquake occurs, she said. The most frightening thing about an earthquake is that it is usually sudden and unexpected.

Every year in California, about two or three strong earthquakes of 5.5 or more are recorded, which cause moderate damage to buildings and other structures, according to the state’s Department of Conservation.

Dr. Jones said she had not heard of any damage to buildings or structures as of Tuesday afternoon and did not expect any.

“If a California building is damaged at this level of earthquake, it is not following building code,” she said.

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