My feelings on it were that the building was shaking due to seismic activity at a low level on the outskirts of the rock wave. The sheer size of the rock wave m

My feelings on it were that the building was shaking due to seismic activity at a low level on the outskirts of the rock wave. The sheer size of the rock wave might make it seem closer than it was. The problem is that we have little indication how far away the base was from the initial blast point. My thought it was quite a distance away since they had X-Wings parked out front in the open.