We measure the macroscopic capillary rise height of water on a chemica
lly heterogeneous solid surface in the presence of vibrational noise.
The amount of relaxation of the macroscopic contact angle depends on t
he mechanical characteristics as well as the energy of the vibrations.
The macroscopic recede and advance contact angles are functions of th
e vibration level. Large enough vibration levels mitigate hysteresis.
Microscopic contact line configurations depend strongly on microscopic
wettability variation on the solid surface. Our study has implication
s for contact angle measurements in normal vibration environments and
for the retention of drops on inclined surfaces.