The first dome of Hagia Sophia collapses

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After a sequence of earthquakes the shallow first dome falls, together with parts of the eastern half-dome and arch. A shallow dome delivers more of its load as horizontal thrust and less as vertical force, so it demands more of its supports precisely where they are weakest; the piers had also deformed under the load. The failure is the empirical result that the design method could not supply in advance.

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