A 6.0 magnitude aftershock killed three people and spread further trauma among those who had survived a week of ongoing tremors.
As of midday Thursday, 167 aftershocks measuring above magnitude 4 had occurred in southwest Sichuan Province, according to the China's Information Office of State Council.
Among the aftershocks, 26 registered above magnitude 5 while four were above magnitude 6, the office said.
The May 12 earthquake destroyed 5.4 million homes and damaged another 21.4 million, according to the the country's official Xinhua news agency.
The earthquake was the most powerful to hit China, the world's most populous country with 1.3 billion people, since an 8.6 magnitude quake struck Tibet in 1950, killing 1,526 people.
A 7.5-magnitude temblor in Tangshan, near Beijing, killed 250,000 people in 1976, according to the U.S. Geological Survey.
