The quake struck at 4:30 pm (0830 GMT) in a sparsely populated area about 84 kilometers (50 miles) west of the Tibetan capital
The USGS said another quake measuring 5.1, likely an aftershock, hit in roughly the same area 15 minutes later.
The quake could be felt in
The agency said the Tibetan seismological department had sent a team to the quake-hit area to investigate.
Early Monday, a moderate earthquake with a magnitude of 5.7 hit