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In Tehran, Iran’s capital, Dr. Bilham has calculated that one million people could die in a predicted quake similar in intensity to the one in Haiti, which the Haitian government estimates killed 230,000. (Some Iranian geologists have pressed their government for decades to move the capital because of the nest of surrounding geologic faults.)

Ali Agaoglu, a Turkish developer ranked 468th last year on the Forbes list of billionaires, described how in the 1970s, salty sea sand and scrap iron were routinely used in buildings made of reinforced concrete. “At that time, this was the best material,” he said, according to a translation of the interview. “Not just us, but all companies were doing the same thing. If an earthquake occurs in Istanbul, not even the army will be able to get in.”

Istanbul stands out among threatened cities in developing countries because it is trying to get ahead of the risk. A first step was an earthquake master plan drawn up for the city and the federal government by Dr. Erdik’s team and researchers at three other Turkish universities in 2006. Such a plan is a rarity outside of rich cities like Tokyo and Los Angeles.Carrying out its long list of recommendations has proved more challenging, given that the biggest source of political pressure in Istanbul, as with most crowded cities, is not an impending earthquake but traffic, crime, jobs and other real-time troubles.Nonetheless, with the urgency amplified by the lessons from Haiti’s devastation, Istanbul is doing what it can to gird for its own disaster.

But a push is also coming from the bottom, as nonprofit groups, recognizing the limits of centralized planning, train dozens of teams of volunteers in poor districts and outfit them with radios, crowbars and first-aid kits so they can dig into the wreckage when their neighborhoods are shaken.

Under a program financed with more than $800 million in loans from the World Bank and the European Investment Bank, and more in the pipeline from other international sources, Turkey is in the early stages of bolstering hundreds of the most vulnerable schools in Istanbul, along with important public buildings and more than 50 hospitals. With about half of the nearly 700 schools assessed as high priorities retrofitted or replaced so far, progress is too slow to suit many Turkish engineers and geologists tracking the threat. But in districts where the work has been done or is under way — those closest to the Marmara Sea and the fault — students, parents and teachers express a sense of relief tempered by the knowledge that renovations only cut the odds of calamity.

“I hope it’s enough,” said Serkan Erdogan, an English teacher at the Bakirkoy Cumhuriyet primary school close to the Marmara coast, where $315,000 was spent to add reinforced walls, jackets of fresh concrete and steel rebar around old columns and to make adjustments as simple as changing classroom doors to open outward, easing evacuations. “The improvements are great, but the building may still collapse,” he said. “We have to learn how to live with that risk. The children need to know what they should do.”In a fifth-grade classroom, the student training that goes with the structural repairs was evident as Nazan Sati, a social worker, asked the 11-year-olds what they would do if an earthquake struck right at that moment. At first a forest of hands shot toward the ceiling. Ms. Sati quickly told them to show, not tell. In a mad, giggling scramble, the students dove beneath their desks. But the threat for children, and their parents, also lies outside the school walls, in mile upon mile of neighborhoods filled with structures called gecekondu, meaning “landed overnight,” because they were constructed seemingly instantly as hundreds of thousands of migrants from rural regions flowed into the city seeking work in the past decade or two.

"The new curriculum will encourage them to think for themselves, the key thing you need in a fast-changing modern world."

The current system also leaves underfunded municipalities in charge of high school education nationwide. This has starved most schools of resources, while leaving some wealthy neighborhood schools well off. Chile’s small upper class sends its children to private schools or even overseas for their education.