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Recent research

Linking topography to rock type

The idea that hillslopes in active mountain belts are limited to a threshold inclination by the rate of landsliding has guided landscape evolution models for over a decade. However, widely applied topographic diagnostics of threshold hillslopes remain debated and unverified.

The morphology of strongly dissected hillslopes prone to frequent landsliding may provide insights to rock-type erodibility



In a recent study I have related landslide occurrence to hillslope metrics of several active mountain ranges throughout New Zealand, which are formed in more or less uniform greywacke and its schist derivative. All these ranges share a distinctive peak in hillslope inclination despite order-of-magnitude variations in rates of rock uplift and precipitation, landslide density, and extent of Quaternary glaciation.

Comparison with landslide-dominated terrain in different lithologies highlights this peak as diagnostic of rock type, reflecting a conspicuous tendency in hillslope evolution to adjust to rock-mass strength irrespective of the intensity of tectonic and climatic forcing. This finding expands the model perspective that only undisturbed strength-equilibrium slopes may adjust to their rock-mass strength.


Read more:

Korup, O., 2008. Rock type leaves topographic signature in landslide-dominated
mountain ranges. Geophysical Research Letters 35, L11402, doi:10.1029/2008GL034157.


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