An earthquake of magnitude 5.1 was recorded in Seven Trees, near San Jose, California, reported the United States Geological Survey (USGS, for its acronym in English).
Preliminary information from the USGS says that the tremor occurred at a depth of 6.9 km, around 11:42 a.m. (Pacific time).
“Additional aftershock tremors can be expected in the region. We continue to monitor this region,” the California Geological Survey tweeted.
About 100,000 people were notified by the Earthquake Warning California app, the state’s early warning system, before the quake began to be felt, according to Brian Ferguson, deputy director of crisis communication and public affairs for the Office of Emergency Services.
“The advance notice was two seconds for those very close to the epicenter or 18 seconds in advance for those in San Francisco,” Ferguson said.
Preliminary reports do not indicate significant damage or injuries, the office of emergency services told CNN.
Dr. Annemarie Baltay, a USGS seismologist, said Tuesday that “there could be 10 to 15 aftershocks of magnitude 3 or greater in the coming week.”
“Aftershocks of this magnitude and duration are totally normal for an event of this type,” she said. “If you feel tremors, don’t forget to drop, cover and hold on.”