Figure 5. Geomorphic fracturing both propagates a fracture front downward and increases fracture density within the shallow subsurface over time. Tectonic fracturing defines a “starting condition” and, along with lithologic character, determines whether a slope will fail by landsliding without any further fracturing. Whereas deep landslides can rupture beneath any geomorphically weathered zone, shallow landslides may be restricted within it, especially when the tectonic fracturing of the underlying bedrock is minimal.
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