At 3:36 a.m., the quake shook an area near Cupertino, according to the USGS, and had a depth of 5.3 miles.
The epicenter was located 2 miles west-southwest of Cupertino and 4 miles northwest of Saratoga, according to the USGS.
The U.S. Geological Survey is reporting an earthquake with a preliminary magnitude of 2.5 struck this morning in Santa Clara County.