BEIJING — The death toll from the powerful earthquake that struck western China Wednesday rose to at least 617 people on Thursday, with 10,000 more injured as many remained buried under debris, Chinese state media reported.

The quake, which struck at 7:49 a.m. in Qinghai Province, bordering Tibet, had a magnitude of 7.1, according to China’s earthquake agency. At least 18 aftershocks measuring more than 6.0 followed throughout the day, government officials said, according to Xinhua.

China’s earthquake agency said the quake centered on Yushu County, a remote and mountainous area sparsely populated by farmers and herdsmen, most of them ethnic Tibetans. The region, pocked with copper, tin and coal mines, is also rich in natural gas.

As with the devastating earthquake two years ago that killed 87,000 in neighboring Sichuan Province, many buildings collapsed, including schools. But with Qinghai’s far smaller and less dense population, the toll is likely to remain far lower.