OG 199 新问

OG199

Because the Earth's crust is more solid there and thus better able to transmit shock waves, an earthquake of a given magnitude typically devastates an area 100 times greater in the eastern United States than it does in the West.

D in the eastern United States will typically devastate an area 100 times greater than will a quake of comparable magnitude occurring in the West

为什么要出现occuring, >  an earthquake in the eastern... than will a quake of... occurring in the west

避免歧义？表将来，跟will对应？ 不明白，望指点

修饰前面的名词啊