The prehistoric Mt Wilberg rock avalanche, Westland, New Zealand |
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| Authors: | Guillaume Chevalier Tim Davies Mauri McSaveney |
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| Institution: | (1) Department of Geological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand;(2) GNS Science, P.O. Box 30368, Lower Hutt, New Zealand; |
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| Abstract: | The Mt Wilberg rock avalanche in Westland, New Zealand occurred before 1300 AD and may have occurred as a consequence of an
Alpine fault earthquake in ca. 1220 AD or earlier. Its ∼40 × 106 m3 deposit may have briefly obstructed the Wanganui River, but only about 25% of its surface morphology still survives, on terraces
isolated from river erosion. The landslide appears to have moved initially as a block, in a direction controlled by a strong
rock mass at the base of the source area, before disintegrating and spreading across terraces, fans, and floodplains. Rock
avalanche deposits in Westland have relatively short expected lifetimes in the rugged terrain and high rainfall of the area;
hence, the hazard from such events is under-represented by their current remnants. |
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