Vampire rock avalanches, Aoraki/Mount Cook National Park, New Zealand

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SR_2008-010-pdf
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Cox, S.C.; Allen, S.K.; Ferris, B.G. 2008 Vampire rock avalanches, Aoraki/Mount Cook National Park, New Zealand. Lower Hutt, N.Z.: GNS Science. GNS Science report 2008/10 34 p.

Abstract: Rock avalanches fell from Vampire (2645m) peak onto Mueller Glacier in Aoraki/Mount Cook National Park (AMCNP) during 2003 and January 2008. An unwitnessed and previously unrecorded 2003 event has been inferred to have occurred sometime between 23 February and about November 2003 from dated images and photographs. Approximately 120,000 m3 (+/- 40,000) of rock collapsed from a 65o slope between 2440-2560 m. Release involved complex failure on joint surfaces and sandstone-argillite bedding. The falling debris was directed down a gully, through the Bannie Glacier icefall, and out 1.9 km across Mueller Glacier, where it formed a 280,000 m2 deposit. Some unknown time afterward (probably during the same collapse sequence, but clearly prior to 2006) up to 100,000 m3 of the debris deposit collapsed and formed a remobilised tongue spreading further down the glacier. The 2003 avalanche dropped a maximum height of 890 m and the angle of reach was 24o. (auth)