  We report experimental results on the decay of wave turbulence in an elastic
plate obtained by stopping the forcing from a stationary turbulent state. In
the stationary case, the forcing is seen to induce some anisotropy and a
spectrum in disagreement with the weak turbulence theory. After stopping the
forcing, almost perfect isotropy is restored. The decay of energy is self
similar and the observed decaying spectrum is in better agreement with the
prediction of the weak turbulence theory. The dissipative part of the spectrum
is partially consistent with the theoretical prediction based on previous work
by Kolmakov. This suggest that the non agreement with the weak turbulence
theory is mostly due to a spurious effect of the forcing related to the finite
size of the system.
