A 5.1-magnitude earthquake struck near San Jose, the US Geological Survey said


A magnitude 5.1 earthquake struck seven trees near San Jose, California on Tuesday, the US Geological Survey (USGS) said.

Preliminary reports from the USGS put the quake at a depth of 6.9 kilometers (4.2 miles) and struck at 11:42 a.m. PT.

About 100,000 people received advanced notice Earthquake Alert California appThe state’s early warning system is in place before a tremor hits, according to Brian Ferguson, deputy director of crisis communications and public affairs for the California Governor’s Office of Emergency Services.

“The advance notice can vary from two seconds for those closest to the earthquake to 18 seconds for those in San Francisco,” Ferguson said.

Initial reports indicated no significant damage or injuries, the Office of Emergency Services told CNN.

Dr. Annemarie Balde, a USGS seismologist, said Tuesday that “10-15 aftershocks of magnitude 3 or higher are possible over the next week.”

“Aftershocks of this magnitude and duration are completely normal for these types of events,” he said. “If you feel yourself shaking, don’t forget to drop, cover, and hold on.”

The USGS reported another earthquake on Tuesday – this time a magnitude 3.6, which struck around 3:08 pm PT. Preliminary data from the USGS showed the quake was at a depth of 7.2 kilometers (4.5 miles).

All seven trees experienced a 2.9-magnitude quake at 11:47 a.m., USGS data show, five minutes after the original 5.1-magnitude quake.

The situation is still fluid and the agency is “actively coordinating with local police and fire personnel to assess roofs, foundations and infrastructure at critical sites such as schools and hospitals,” Ferguson said.

Earthquakes are measured using seismographs, which tracks the seismic waves that travel through the Earth after an earthquake strikes. Earthquakes of magnitudes 2.5 and 5.4 are often felt, but cause only minor damage. Michigan Tech’s UPSeis website.

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