Rock motions propagate up through the soil layers to the ground surface, where they become "ground motions" -- rock motions cause ground motions.
(they; become; ground motions; L:the soil layers to the ground surface) (rock motions; cause; ground motions) Context(rock motions cause,List([111, 129))):(Rock motions; propagate up; through the soil layers to the ground surface)
rock motions cause,List([111, 129))
they rock motions Rock motions
become cause propagate up
ground motions L:the soil layers to the ground surface
ground motions
through the soil layers to the ground surface