Thousands more are reported to be missing after the magnitude 7.9 quake hit on Monday afternoon and officials have warned the death toll is likely to rise much further.
State media reported on Tuesday afternoon that rescue workers had reached the epicentre in Wenchuan county.
Rescue workers say that 3,629 people have died in Mainying city, which lies close to the epicentre of the earthquake, according to Xinhua state news agency.
Up to 18,645 people are buried under debris in the city, Xinhua reported.
Al Jazeera correspondent Melissa Chan, who is in the quake zone, said soldiers had been parachuted into the area or had trekked in on foot after roads were blocked with fallen trees and boulders.
She said bad weather was making rescue work difficult and exacerbating landslides triggered by the quake.
With shocks continuing to hit the region, many survivors in the worst-hit areas have taken to living on the streets, afraid to return to possibly weakened buildings.
Rescue workers meanwhile are continuing to race against time, digging through tonnes of debris in the hope of finding survivors trapped in the rubble.
In the city of
The magnitude 7.9 quake which struck on Monday was the most powerful to hit
The first tremor hit at 2:48pm local time (06:28 GMT) with its epicentre 92km northwest of
Schools hit
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Many of the victims were schoolchildren who were in class at the time the quake hit.
In the city of
Chan said the bodies of at least 200 children had been pulled from the rubble of one collapsed school outside of
In the industrial city of
The collapse triggered a spill of about 80 tonnes of toxic ammonia.
Casualties have also been reported in the
The massive Three Gorges Dam, located several hundred kilometres to the west of the quake zone, was not damaged, officials have said.
The
Soldiers deployed
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About 20,000 police and soldiers have been deployed to the disaster area, with Wen Jiabao, the Chinese premier, in the region to oversee recovery efforts.
"The situation is worse than we previously estimated and we need more people here to help," he said at the emergency co-ordination centre.
"So long as there's a glimmer of hope, we will make every effort. We will not rest."
Hu Jintao, the Chinese president, has called for an "all out" effort to rescue victims.
Monday's initial quake lasted for several minutes and was powerful enough to be felt across several cities in South-East Asia, including Bangkok, the Thai capital, more than 1,800km from the epicentre.
The magnitude 7.8 earthquake was followed by an equally powerful aftershock almost a day later; together they killed around 240,000 people.