The time required for a motion, for example to reach out one's hand, to walk, to stoop down, or crouch and so forth, varies in proportion to the distanceofmotion.
The bigger particle diameter, and the bigger particle density, the longer the distanceof particle motion will be.
粒子直径越大、密度越大,在同样时间内,粒子移动的距离越远;
3
Both seismological theory and macroseismic observation show that the shape of strong motion response spectrum depends mainly on magnitude, distanceof epicenter and engineering site condition.