There were no initial reports of casualties. The official Xinhua News Agency said a slight tremor was felt in the provincial capital of Chengdu.
Nearly 70,000 people died when a 7.9-magnitude quake hit Sichuan on May 12. Another 18,000 people are still missing and 5 million were left homeless in China's worst disaster in three decades.
There have been hundreds of aftershocks in Sichuan, but most have been of low intensity.
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