DUJIANGYAN, China - Modern apartment buildings and schools crumbled, smoothly paved highways buckled, and bridges collapsed - their flimsy construction no match for the awesome forces of nature.

As the death toll soars from the earthquake that ravaged China's Sichuan province, the scale of the devastation is raising questions about the quality of the nation's recent construction boom.

"This building is just a piece of junk," one newly homeless resident of Dujiangyan yelled, her body quivering with rage. Her family salvaged clothing and mementos from their wrecked apartment, built when their older home was razed 10 years ago.

"The government tricked us. It told us this building was well-constructed," said the woman, who would give only her surname, Chen.

High-paced growth over three decades has remade China, with stunning showcase metropolises such as Beijing and Shanghai as well as formerly tiny county towns that are now small cities with office towers and multistory apartment buildings. But as the widespread devastation from Monday's quake shows, the pell-mell pace has led some builders to cut corners, especially in outlying areas largely populated by the very young and the very old.

"This new economy in China is not going up safely, it's going up fast, and the two don't go together," said Roger Bilham, a professor of geological sciences at the University of Colorado at Boulder. "You look at the buildings that fell and they should not have fallen," he said. "This is a story that has been repeated throughout the developing nations."

New buildings in Beijing - such as the signature "Bird's Nest" National Stadium for the August Olympics - are built to exacting codes to withstand earthquakes. But anti-earthquake standards are not as strict in places such as Sichuan as in Shanghai.

Monday's temblor flattened smaller towns in the disaster zone like Yingxiu, where 7,700 people were reported to have died. A hilltop view of Beichuan, another hard-hit town, showed entire blocks of apartment buildings that seemingly disintegrated.

In Dujiangyan city, where rescuers saved a woman eight months pregnant who was trapped for 50 hours, there was little evidence of steel reinforcement bars in the concrete rubble.

Other infrastructure old and new suffered as well. Nearly 400 dams, most of them small, were damaged across Sichuan, the government's economic-planning agency said on its Web site. One of the two bigger ones, Zipingpu, had cracks four inches across its top, and though the government said the dam was safe, its reservoir was drained.

China is jolted by thousands of earthquakes every year, at least several of them major ones that cause significant damage and loss of life. Since the 1976 quake in Tangshan near Beijing killed at least 240,000, the communist government has tried to improve building standards.

"China has been taking earthquake safety very seriously in the past 10 to 20 years," said Susan Tubbesing, head of the California-based Earthquake Engineering Research Institute. "From what I understand, the codes China has adopted in the past 20 years have been good, solid, seismic codes."

The codes are designed according to the level of shaking expected from a major temblor. In Sichuan province, new buildings are built to withstand a shaking level of 7, Souch said. But the magnitude-7.9 quake produced a shaking intensity of 10 near the epicenter, which usually results in total collapses.

Another problem is that actual enforcement of building codes varies. The construction boom that has underpinned much of the stunning growth has also been an invitation for corruption, with officials and developers colluding. Profit margins are thinner on smaller projects in less prosperous places, encouraging developers to cut corners.

In larger cities like Shanghai, authorities generally enforce regulations. But that isn't always true in smaller cities, said Andrew Smeall, of Asia Society's Center on U.S.-China Relations in New York.

"The cost of trying to go back and make sure everything is built to code would be prohibitive," he said.