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We study the time evolution of wavepackets of non-interacting electrons in atwo-dimensional disordered system in strong magnetic field. For wavepacketsbuilt from states near the metal-insulator transition in the center of thelowest Landau band we find that the return probability to the origin $p(t)$decays algebraically, $p(t) \sim t^{-D_2/2}$, with a non-conventional exponent$D_2/2$. $D_2$ is the generalized dimension describing the scaling of thesecond moment of the wavefunction. We show that the corresponding spectralmeasure is multifractal and that the exponent $D_2/2$ equals the generalizeddimension $\widetilde{D}_2$ of the spectral measure.Comment: 8 pages, RevTeX 3.0, 4 PostScript figures in uuencoded compressed tar  file include

Relation between the correlation dimensions of multifractal wave functions and spectral measures in integer quantum Hall systems