3 ms·
If... the sinking areas sink at the same rate indefinitely forever. Civil Engineering 101 covers soil compaction as a log function as voids are removed. 1-2mm a
by ethagknight 3y ago
If... the sinking areas sink at the same rate indefinitely forever. Civil Engineering 101 covers soil compaction as a log function as voids are removed. 1-2mm a year turns to .1-.2 mm/yr after a few years, which turns to.. negligible sinking. The implication that the soil and bedrock are just oozing out from under the city is wholly unsubstantiated.
- rich_sasha 3y agoI understood from a childhood book that the magic making Manhattan possible is that the tallest skyscrapers actually attach to a granite bedrock 30m below ground level. Is this wrong (damn you "first encyclopaedia for children") or would that imply that somehow the granite bedrock itself is sinking?
- schiffern 3y agoThe granite bedrock itself can indeed sink/rise, if you add/remove large amounts of weight on top. https://en.wikipedia.org/wiki/Isostatic_depression https://en.wikipedia.org/wiki/Isostatic_depression https://en.wikipedia.org/wiki/Isostatic_rebound https://en.wikipedia.org/wiki/Isostatic_rebound