Figure 4. Fracture-density profiles for ~70 sites in Fiordland, New Zealand. Curved black lines indicate the change in fracture density with depth within the geomorphically fractured layer. Although the geomorphic layer could extend up to depths of 16 m, its average depth is ~7 m. Notably, where a geomorphically fractured layer is present, the mean fracture density of the underlying bedrock (0.05) is four times less than the mean (0.2) when no geomorphic fracturing is observed. This contrast is interpreted to indicate that strong underlying rock apparently both inhibits failure by landslides and promotes geomorphic fracturing.
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Oct9 09
