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| 5.1-Magnitude Earthquake Jolts Bay Area | 5.1-Magnitude Earthquake Jolts Bay Area |
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| A 5.1-magnitude earthquake rattled the San Francisco Bay Area on Tuesday, according to the U.S. Geological Survey. There were no immediate reports of injuries or damage. | A 5.1-magnitude earthquake rattled the San Francisco Bay Area on Tuesday, according to the U.S. Geological Survey. There were no immediate reports of injuries or damage. |
| The earthquake struck around 11:42 a.m. local time, about nine miles east of Seven Trees, a neighborhood in San Jose, Calif. It was followed about five minutes later by a 3.1-magnitude aftershock, U.S.G.S data shows. | The earthquake struck around 11:42 a.m. local time, about nine miles east of Seven Trees, a neighborhood in San Jose, Calif. It was followed about five minutes later by a 3.1-magnitude aftershock, U.S.G.S data shows. |
| The U.S.G.S. called it a “notable quake,” but described the intensity of shaking from the earthquake as weak to moderate. The agency said that about 18,000 people across the Bay Area and beyond had reported that they felt the earthquake. | The U.S.G.S. called it a “notable quake,” but described the intensity of shaking from the earthquake as weak to moderate. The agency said that about 18,000 people across the Bay Area and beyond had reported that they felt the earthquake. |
| People felt the earthquake from Central California north to Sacramento and Sonoma County, Annemarie Baltay, a seismologist, said in a video issued by the U.S.G.S. | |
| “There is a one-in-100 chance of an aftershock greater than a magnitude 5 in the next day,” she said. “There could be 10 to 15 aftershocks of magnitude 3 or greater in the next week. Aftershocks of this magnitude and duration are totally normal for an event of this type.” | |
| The earthquake likely occurred along the Calaveras Fault, a branch of the San Andreas Fault system, Dr. Baltay said. | |
| It was the strongest earthquake in the Bay Area since a 6-magnitude earthquake in 2014, said Lucy Jones, a geophysics researcher at the California Institute of Technology. | |
| “It’s a once-every-decade or so type of event,” said Dr. Jones, the founder of the Dr. Lucy Jones Center for Science and Society. | |
| The earthquake warning system, which sends alerts to smartphones, gave people at least a few seconds of warning before it happened, she said, adding that the most frightening part of an earthquake is normally its suddenness and unpredictability. | |
| In California, about two or three strong earthquakes are recorded each year with a magnitude of 5.5 or greater, causing 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 she did not expect any. | |
| “If a California building is damaged at this level of earthquake, it’s not following the building code,” she said. |