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Fig. 7

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Simplified model of surface mass movement. Here, we have H = Hreg − h, where h indicates the depth of regolith deposits that has been moved thus far. The failure region is −θFR < θ < θFR, denoted as FR in the figure. The newly moved regolith mass is dm = 4 sin θFRdh and it is originally located in the depth h to h + dh.
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