How would falling buildings affect the earth?

So basically, humankind was t the pinnacle of technological greatness. We had a massive network of floating cities all around the globe. During "The Fall", all the massive spire-like buildings fell, impacting the earths crust with enough force to cause massive earthquakes. Assuming cities are made up of individual spires that are interconnected by skybridges and the like, is this plausible? Imagine huge nails being driven into the earth. Also, what would these cities look like 50 years later?

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How would falling buildings affect the earth?

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