"A magnitude-6.9 quake has hit China's autonomous region of Tibet, the US Geological Survey says.
There were no immediate reports of damage or casualties from the area, in the mountains that divide Qinghai province from the Tibet Autonomous Region.
The quake was centred 240 kilometres north north-west of Qamdo in Tibet and 380 kilometres south south-east of the mining town of Golmud in Qinghai, and had a depth of 47 kilometres, the USGS said.
The foothills to the south and east of the area are home to herders and Tibetan monasteries, while the area to the north and west is arid and desolate.
A magnitude-5.0 quake struck the same region late on Tuesday night.
Another big 'un,folks....