Geological engineering study of slope in accretionary prism area, Shikoku-The mountains in Shikoku split initially from mountain ridges-

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In Shikoku mountains, hard rock of accretionary prism slips down. The mountain ridges, everywhere, have split by the motion of Nankai earthquake which occurs once in about 100 years. Rainwater flowed into the crack deteriorates bed of specific lithofacies, and the deteriorated bed is bred up slip surface of juvenile landslide. The landslide of accretionary prism begins to slip from the crack on the mountain ridge and continues to move without erosion of the toe.