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[APD] Re: Aquarium as Seismometer

We built a new convention center here that has a ballroom above the exhibit halls below with long span steel trusses supporting the load. Turns out the engineer didn't design in enough rigidity to the ballroom floor and it can be put into a rythmic motion under the right circumstances, such as the bounce created by a lot of dancers. The fix? Computer controlled equipment with big weights mounted to the steel trusses that can be set into counter motion to dampen the dancer's bounce. Accelerometers are involved, and they didn't look all that complicated. So maybe a big lead weight sliding on a rod connected to a computer?


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