China quake: 10,000 killed | Pics: Debris and devastation

UNDER THE SURFACE: Rescue workers pull out a young girl from under the rubble of a collapsed school in Juyuan.

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Keywords: Chengdu, Sichuan

"Earthquakes in this part of China are infrequent but not uncommon," he said.

The last major earthquake in the region occurred in the northwestern margin of the Sichuan basin when a 7.5-magnitude quake killed more than 9,300 people on August 25, 1933.

President Hu Jintao ordered an all-out effort to help those affected, and Premier Wen Jiabao traveled to the region to direct the rescue work, Xinhua reported.

"My fellow Chinese, facing such a severe disaster, we need calm, confidence, courage and efficient organization," Wen was quoted as saying.

"I believe we can certainly overcome the disaster with the public and the military working together under the leadership of the CPC Central Committee and the government."

Peter Sammonds, professor of geophysics at University College London, called the earthquake "tremendous."

"Particularly in the more remote, the more mountainous part where this has taken place, a lot of the buildings are built on sediments that are quite unstable. They're probably liquifying, causing the buildings to collapse. You might expect landslides to occur, which could actually stop the relief efforts going through on the roads, so this could be very grim in the remoter, more mountainous parts of this province."

While many of the most immediate efforts were focused on Sichuan Province, Xinhua also reported dead and injured in Gansu, Chongqing and Yunnan provinces.

A provincial government spokesman said they feared more dead and injured in collapsed houses in Dujiangyan City in Wenchuan County.

A driver for the seismological bureau said he saw "rows of houses collapsed" in Dujiangyan, Xinhua reported.

Bonnie Thie, the country director of the Peace Corps, told CNN she was on a university campus in Chengdu about 60 miles from the epicenter, in the eastern part of China's Sichuan province, when the first quake hit.

"You could see the ground shaking," Thie told CNN.

The shaking "went on for what seemed like a very long time," she said.

Bruce Presgrave, a geophysicist with the US Geological Survey, said this quake could cause major damage because of its strength and proximity to major population centers. Also, it was relatively shallow, and those kinds of quakes tend to do more damage near the epicenter than deeper ones, Presgrave said.

An earthquake with 7.5 magnitude in the northern Chinese city of Tangshan killed 255,000 people in 1976 -- the greatest death toll from an earthquake in the last four centuries and the second greatest in recorded history, according to the US Geological Survey. Tangshan is roughly 995 miles (1,600 km) from Chengdu, the nearest major city to the epicenter of Monday's quake.

After the quake struck Monday, the ground shook as far away as Beijing, which is 950 miles (1,528 km) from the epicenter. Residents of the Chinese capital, which hosts this year's Olympic Games in August, felt a quiet, rolling sensation for about a minute.

Thousands of people were evacuated from Beijing buildings immediately after the earthquake.

At least seven more earthquakes -- measuring between 4.0 and 6.0 magnitudes -- happened nearby over the four hours after the initial quake at at 2:28 p.m. local time, the USGS reported.

spokesman for the Beijing Olympic Committee said no Olympic venues were affected. The huge Three Gorges Dam -- roughly 400 miles east of the epicenter -- was not damaged, a spokesman said.

The earthquake was also felt in Hong Kong, Shanghai, Taiwan, and as far away as Hanoi, Vietnam, and Bangkok, Thailand, according to the Hong Kong-based Mandarin-language channel Phoenix TV.