No casualties were reported, local officials said.
Dawa, head of the government in Zadoi County, Yushu Tibetan Autonomous Prefecture, where the epicenter was located, told Xinhua the county government had dispatched a work team to the quake-hit area.
A devastating 7.1-magnitude earthquake shocked Yushu in April 2010, leaving 2,698 dead and over 12,000 injured.