AFP journalists in Jiuzhaigou, a popular tourist destination near the epicentre of Tuesday night's 6.5- magnitude quake, saw dozens of relief and military trucks rolling through the remote corner of Sichuan province.
Locals took refuge in blue relief tents in several makeshift camps or out on streets in towns as menacing aftershocks and landslides kept nerves on edge.
The quake's epicentre was near Jiuzhaigou, an area populated largely by ethnic Tibetans and Qiang people.
But authorities were searching for more, with the Sichuan provincial fire department saying 16 tourists were believed stranded at a lake in the national park.
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Yang Yongzhi was among a search team in red jumpsuits and hardhats who were forced by landslides to turn back Wednesday night after trying to press into cut-off valleys.
"This morning we plan to try again," Yang said.
"We're responsible for finding if there are still people trapped over there. We're the first to go check."
Authorities kept the death toll unchanged Thursday at 19 but scores more injured turned up, bringing the total to 343, 34 of them seriously hurt. A Frenchman and a Canadian woman were among the injured.
The quake tore cracks in mountain highways and AFP journalists saw cars that had been smashed by giant falling boulders.
Some buildings in towns bore cracks, but few structures appeared to have sustained heavy damage.
It was not known if others were still buried.
Authorities have said thousands of response personnel were sent into the area.
So far, 200 million yuan (USD 30 million) in government relief funds had been allocated for quake relief, authorities said, and the government of Aba prefecture where Jiuzhaigou is located issued an appeal for donations.
The local government said it had repaired 129 telecommunication towers or other installations that were damaged by the quake, restoring communications with much of the affected area.
All told, nearly 60,000 people were evacuated from quake-hit towns and villages as more than 1,000 aftershocks hit the region.