The noise of the graphical output under visco-elastic analysis

After comparison, I found in 3D-Move, the elastic result is very smooth expected, but the visco-elastic result has lots of noise there. Could somebody explain it, please? Thanks!
The elastic result:
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The visco-elastic result:
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The "noise" in the response is related to the rough pavement surface used in the analysis which is reflected by a dynamic load coefficient (DLC) of 0.218. In order to obtain a smooth response your DLC value should be equal to zero.
Elie

You are right, it does. Thank you very much, Elie.