Fig. 2.

Flow diagram of approaches #1 and #2 for determination of viscoelastic mechanical parameters from the measured displacement u(z,t). Approach #1 involves sinusoidal fitting of the calculated strain γ versus time t at each depth z, while approach #2 involves elliptical fitting of γ versus stress τ for all z. All plotted data is from a representative sample sheared at f = 1 Hz with γ_i = 0%.