What causes buildings to suddenly collapse after an earthquake?

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College of Engineering - Oregon State University
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Scott Ashford, Kearney Dean of Engineering, addresses the public's most common question about earthquakes: why do buildings suddenly collapse after an earthquake?

According to Scott, older buildings are often more brittle, so when they break, they do so suddenly. Additionally, these older buildings frequently have a weak first floor. When that floor is damaged, it often leads to the collapse of the entire building.

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