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максимальное ускорение грунта во время землетрясения (Zero period ground accelaration = Peak ground acceleration: The so-called zero period acceleration (ZPA) is the maximum ground acceleration during the event,
This is also the high-frequency asymptotic value of the absolute acceleration (or pseudoacceleration) in the response spectrum. It corresponds to the F-G part of the idealized spectrum.  comsol.com DRE) | |||