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Earth Sciences
Does Stiff Soil Resonate with Short Storey Buildings During Seismic Movements?
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[QUOTE="Baluncore, post: 6041197, member: 447632"] For a specified seismic wave, the frequency spectrum of the vibration is the same, but the amplitude of oscillation is greater in slower rocks. The foundations of small buildings do not need to be deep, so are often just the low velocity surface soil covered by a concrete slab. The foundations of tall buildings are dug well down below the low velocity weathered soil, onto deeper fast rock. So small buildings tend to be shaken by greater amplitude waves than tall buildings. A tall building built on a low velocity rock, such as a volcanic tuff, will be shaken significantly more than if it were securely founded on a fast granite. [/QUOTE]
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Does Stiff Soil Resonate with Short Storey Buildings During Seismic Movements?
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