A total of four earthquakes -- the strongest of them a powerful 7.2 magnitude quake -- hit western China on Friday, the U.S. Geological Survey reported.
The Chinese Seismological Network also reported the quakes, according to China's state-run Xinhua news agency. There were no immediate reports of damage or injuries, Xinhua said.
The quakes hit the border area of western China's Xinjiang and Xizang regions starting at about 6:30 a.m. local time, according to the USGS. Their epicenters were all at least six miles under the Earth's surface.
The last aftershock hit the area more than an hour later.
The USGS considers earthquakes between 7.0 and 7.9 to be "major" earthquakes.
The temblor was followed about 17 minutes later by a magnitude-5.3 aftershock, according to the USGS. The two that followed were magnitude 5.5 and magnitude 4.8.
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