In the recent earthquake in Turkey you see modern buildings crumble or pancake but a 500 year old mosque seems to be survived with only minor damage.
In: 2
1. Modern buildings were built cost effective. Meaning they were built the least ammount of materials necessary.
2. Its not the first earthquake in the region. Meaning if there were older buildings weak enough to be destroyed they would be gone by now.
3. Today, we use reinforced concrete for buildings. Its strong, but also hard and rigid. In the past they used weaker and more flexible materials. They had to build thicker walls from it,but because its flexibility its less prune to damage caused by earthquakes.
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