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Rescue workers search for survivors at the site of a collapsed building in Yushu county. The quake wreaked havoc on the flimsy earth and wood houses near the epicentre. Image Credit: AP

Beijing:  A series of strong earthquakes struck a mountainous Tibetan area of western China yesterday, killing at least 400 people and injuring more than 10,000 as houses made of mud and wood collapsed, officials said. Many more people were trapped and the toll was expected to rise.

The largest quake was recorded by the US Geological Survey (USGS) as magnitude 6.9. In the aftermath, panicked people, many bleeding from their wounds, flooded the streets of a Qinghai province township where most of the homes had been flattened. Students were reportedly buried inside several damaged schools.

In pictures: Earthquakes rattle China

Paramilitary police used shovels to dig through the rubble in the town, footage on state television showed. Officials said excavators were not available and with most of the roads leading to the nearest airport damaged, equipment and rescuers would have a hard time reaching the area. Hospitals were overwhelmed, many lacking even the most basic supplies, and doctors were in short supply.

Downed phone lines, strong winds and frequent aftershocks also hindered rescue efforts, said Wu Yong, commander of the local army garrison, who said the death toll "may rise further as lots of houses collapsed".

Tents and blankets

With many people forced outside, the provincial government said it was rushing 5,000 tents and 100,000 coats and blankets to the mountainous region, at around 4,000 metres high and where night time temperatures plunge below freezing.

Workers were racing to release water from a reservoir in the disaster area where a crack had formed after the quake to prevent a flood, according to the China Earthquake Administration.

The quake, which struck at 7.49am local time (2349 GMT), was centred on Yushu county, in the southern part of Qinghai, near Tibet, with a population of about 100,000, mostly herders and farmers.

The USGS recorded six shocks in less than three hours, all but one registering 5 or higher. The China Earthquake Networks Centre measured the largest quake's magnitude at 7.1. Qinghai averages more than five earthquakes a year of at least magnitude 5, according to the official Xinhua News Agency. They normally do not cause much damage in the sparsely populated province.

Residents fled as the ground shook, toppling houses made of mud and wood, as well as temples, gas stations, electric poles and the top of a Buddhist pagoda in a park, witnesses and state media said. The quake also triggered landslides, Xinhua said.

"Nearly all the houses made of mud and wood collapsed. There was so much dust in the air, we couldn't see anything," said Ren Yu, general manager of Yushu Hotel in Jiegu, the county's main town. "There was a lot of panic. People were crying on the streets. Some of our staff, who were reunited with their parents, were also in tears."

Hotel guests

More than 100 guests of the hotel, which was relatively undamaged, were evacuated to open spaces such as public squares, Ren said by phone. After transporting guests to safety, hotel staff then helped in rescue efforts in other buildings, Ren said.

"We pulled out 70 people, but some of them died on the way to the hospital," Ren said, adding other survivors were put in tents in the hotel yard while they awaited assistance.

The death toll rose to about 400 by afternoon, according to China Central Television. Emergency official Pubucairen, who goes by only one name, was quoted as saying that the number of injured has risen to more than 10,000. The official said rescuers were treating the injured at hospitals, race tracks and sports stadiums.

President Hu Jintao sent a vice-premier to supervise rescue efforts and more than 5,000 soldiers, medical workers and other rescuers were mobilised, joining 700 soldiers already on the ground, Xinhua said. A message of sympathy also came from the Dalai Lama, the exiled spiritual leader of the often fervently Buddhist Tibetans who is reviled by Chinese leaders.