An earthquake measuring 6.4 on the Richter scale struck the remote Qinghai Province in northwest China at 9:52 a.m. Friday, the China Earthquake Administration said, but no casualties have been reported.

A total of 128 aftershocks had been registered by 11 a.m. near the epicenter in the Dachaidan region in the Mongolian-Tibetan Autonomous Prefecture of Haixi, with the strongest measuring 5.3 magnitude that struck at 10:14, according to the Qinghai Provincial Seismological Network.

"So far, we have not received reports of casualties or house collapses," the provincial government said in a statement.

"The governments of the province, the Haixi prefecture and Golmud City have sent staff to investigate," it said.

Dachaidan is a sparsely populated region with an average altitude of 4,000 meters.

The epicenter, at 37.6 degrees north and 95.8 east, was about 140 km away from Delingha City, the capital of the Haixi prefecture, and about 160 km away from Golmud, another major city in Haixi, according to the China Earthquake Administration.

The quake was strongly felt in both cities, the administration said.

The China Earthquake Administration, the National Disaster Reduction Committee and the Ministry of Civil Affairs have all sent staff to the quake-hit region for relief work.

(Xinhua News Agency August 28, 2009)