The water is just convenient. Most of the time a large mass is used to reduce sway in wind conditions, basically a big shock absorber. For earthquakes thev may have some sort of system in the foundation to prevent too much movement/damage. The water is easier because it can be pumped up, the large mass has to be moved up to the top in pieces and assembled, very difficult to do.
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Originally Posted by Dubyagee
They use setups like that in skyscrapers in Japan. They mount the water tank hanging from the ceiling of the top floor to counter earthquakes.
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