The epicentre of the quake, with a depth of 10 km, was felt in Haixi Mongolian and Tibetan Autonomous Prefecture, China Earthquake Networks Centre said.
Li Yuejin, deputy director of the Qinghai Provincial Seismological Bureau, told state-run Xinhua news agency that the quake took place in a scarcely populated region, 85 km away from the nearest township.
Another minor tremor measured at 4.2-magnitude also struck Qinghai, this morning.
The epicentre, again with a depth of 10 km, was in the Yushu Tibetan Autonomous Prefecture in the south of the province, according to the centre.
No casualty has been reported so far.
Beijing: A moderate 5.1-magnitude quake on Tuesday jolted parts of northwest China's Qinghai Province close to Tibet but no casualities were reported.
First Published: Tuesday, February 12, 2013, 21:27