UFO's are all the rage this year, and now we have a UFE! This is the best earthquake story I've seen in 10 years. They didn't have any monitoring in the building, and are now scratching their heads.
This could have been caused by a rare sync of elevators, or a sudden settlement. Acceleration monitors would have 'settled' it. As it is, unless cracks appear, it is just a UFE. Will the people be confident to go back in? What would happen in a real earthquake? Maybe all those tin cans they like to use for stuffing concrete decided to compress.
ps. I think it was a bunch of pellyton treadmills on the top floor. Now, they can add another warning - May cause a tall building to collapse. In that case, place your toddler under the belt. :)
pps. the hydro building downtown Toronto was always shaking on the huge post-tensioned floor slabs. Sometimes the elevators would all sync, and then they had to cancel the lunchtime dancercise classes. Also, I thought those huge tension tendons would break sometimes. They never had the nerve to check them.
more: those long suspension pedestrian bridges do the same.
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