Rescue workers have plucked more than 60 more survivors from the rubble following Monday's massive earthquake in southwestern China, as a strong new aftershock hit and the death toll rose to almost 30,000.
The United States Geological Survey reported a tremor of 6.1 magnitude early on Sunday centred 80km west of Guangyuan, the latest in a series of aftershocks to hit Sichuan province.
The official Xinhua news agency said there was no immediate word of additional damage or casualties in the area.
In the provincial capital, Chengdu, some 200km south of the new tremor's epicentre, buildings swayed and people rushed out into the streets, risking a soaking from a passing storm.
At least 56 people were rescued in Yingxiu, close to the epicentre of Monday's 7.9 magnitude quake, but around 11,000 people are thought to remain trapped, the official Xinhua news agency said.
Soldiers engaged in relief work "have their hands stained with blood and earth after days of searches in the debris", Xinhua added.
"I was expecting to see my son's body. I never expected to see him alive," it quoted Long Jinyu, the mother of one of the survivors found in the rubble, as saying.
Other people were found alive in Beichuan county, also hard hit by the earthquake, Xinhua said.
Thousands of people have fled in the Beichuan area amid fears a lake could burst its banks, hampering rescue efforts after the deadliest earthquake in more than three decades.
At least one barrier lake, formed after rocks blocked a river, has burst its banks but caused no casualties, Xinhua said.
Rescue work has been complicated by bad weather, treacherous terrain and hundreds of aftershocks.
President Hu Jintao urged emergency workers not to give up efforts to find survivors. "We should put people first and saving people's lives is still the top priority of the relief work," he said.
Hu also praised international help given to China.
"I express heartfelt thanks to the foreign governments and international friends that have contributed to our quake-relief work," Xinhua quoted Hu as saying.
Offers of help have flooded in and rescue teams from Japan, Russia, Taiwan, South Korea and Singapore have arrived. Donations from home and abroad have topped 6 billion yuan ($NZ1.1 billion).
China has said it expects the final death toll from the earthquake to exceed 50,000. About 4.8 million people have lost their homes and the days are numbered in which survivors can be found.
Premier Wen said the quake was "the biggest and most destructive" since before the Communist revolution of 1949 and the quick response had helped reduce casualties.
China has sent 150,000 troops to the disaster area, but roads buckled by the quake and blocked by landslides have made it hard for supplies and rescuers to reach the worst-hit areas.
Reuters