A moderate earthquake shook a wide section of northern California, knocking items off grocery shelves but causing no injuries or major damage.

The quake Wednesday night had a magnitude of 4.7 on Richter scale, according to the University of California at Berkeley Seismographic Stations. The U.S. Geological Survey in Menlo Park gave a preliminary reading of 4.5, with an epicenter 11 miles northeast of San Jose on the Calaveras Fault.Most who felt the quake described it as two sharp jolts but said it was not frightening.