Abstract
The results presented in Figure 9were obtained using an imposed block velocity (Vzblock) and the corresponding pressure gradients (Pdriv) assuming an incorrect dyke thickness (Wd) of 1 m, instead of the correct value ofWd = 0.5 m. According to Equation 9, for a given Vzblock, the value of Pdriv should be 4 times lower in a 1 m dyke than in a 0.5 m dyke. Hence, in order to correctly scale the results (i.e., to obtain the same behaviour in 0.5 m dyke than in a 1 m dyke), the time scales shown in Figure 9 need to be increased by a factor 4 and values of Pdriv reported need to be decreased by a factor 4. As an example, the corrected Figure 9 for Intermediate Vz experiment thus becomes:
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