A preliminary magnitude 3.6 earthquake struck near San Jose on Thursday morning at 5:15 a.m., according to the US Geological Survey.
At a depth of 6 kilometers, the quake was centred near Alum Rock.
There was no immediate word on damage or injuries caused by the earthquake, though a number of residents reported waking up to a jolt.
At 5:15 a.m., the temblor struck 5.4 miles west of Alum Rock and 9.2 miles west of San Jose. It was 3.73 miles deep.
More information about this earthquake can be found on the USGS event page.
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