Guild Wars 2

Did anyone else notice that there are small tremors in the maguuma maps? And I think I noticed it in one of the north Tyrian maps too.
You know, like you get the ground shaking in Doric’s Waypoint outpost in Malchor’s Leap before Risen attack.

I wonder if the next LS update will have Mordremoth vines coming out of the ground all over the place.

LS Season 2 is over with. The next thing is the expansion Heart of Thorns.

Are the tremors only cosmetic? Or do they have crowd control effects such as knockdown or a way to disorient?