An earthquake measuring 6.4 on the Richter scale hit Menyuan county of Haibei Tibetan Autonomous Prefecture in northwest China's Qinghai province at 1:13 a.m. on Thursday.

The epicenter was monitored at 37.68 degrees north latitude and 101.62 degrees east longitude, with a depth of 10 kilometers, according to the China Earthquake Networks Center (CENC).

An aftershock, measuring 3.4 on the Richter scale, was reported minutes following the initial quake.

Reports of casualties are not instantly available.

Tremors are felt in Xining, capital city of Qinghai Province, where local residents say they were waken up from sleep by the jolt.