Early Thursday morning there was a 3.6 magnitude earthquake south of San Jose according to the United States Geological Survey.
The earthquake was centred 8.6 km east of Alum Rock at a depth of 6 km.
The earthquake occurred at 5:15 a.m. along the Calaveras Fault.
The northern end of the central segment of the Calaveras Fault last produced a notable earthquake in October 2007, the M5.4 Alum Rock earthquake, which ruptured to the south.
There were no reports of damage or injuries but it was felt in San Jose, Santa Clara, Milpitas, Campbell and Morgan Hill according to local media agencies.