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Transport and emplacement mechanisms of channelised long-runout debris avalanches, Ruapehu volcano, New Zealand

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Abstract

The steep flanks of composite volcanoes are prone to collapse, producing debris avalanches that completely reshape the landscape. This study describes new insights into the runout of large debris avalanches enhanced by topography, using the example of six debris avalanche deposits from Mount Ruapehu, New Zealand. Individual large flank collapses (>1 km3) produced all of these units, with four not previously recognised. Five major valleys within the highly dissected landscape surrounding Mount Ruapehu channelled the debris avalanches into deep gorges (≥15 m) and resulted in extremely long debris avalanche runouts of up to 80 km from source. Classical sedimentary features of debris avalanche deposits preserved in these units include the following: very poor sorting with a clay-sand matrix hosting large subrounded boulders up to 5 m in diameter, jigsaw-fractured clasts, deformed clasts and numerous rip-up clasts of late-Pliocene marine sediments. The unusually long runouts led to unique features in distal deposits, including a pervasive and consolidated interclast matrix, and common rip-up clasts of Tertiary mudstone, as well as fluvial gravels and boulders. The great travel distances can be explained by the debris avalanches entering deep confined channels (≥15 m), where friction was minimised by a reduced basal contact area along with loading of water-saturated substrates which formed a basal lubrication zone for the overlying flowing mass. Extremely long-runout debris avalanches are most likely to occur in settings where initially partly saturated collapsing masses move down deep valleys and become thoroughly liquified at their base. This happens when pore water is available within the base of the flowing mass or in the sediments immediately below it. Based on their H/L ratio, confined volcanic debris avalanches are two to three times longer than unconfined, spreading flows of similar volume. The hybrid qualities of the deposits, which have some similarities to those of debris flows, are important to recognise when evaluating mass flow hazards at stratovolcanoes.

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Acknowledgments

Manuela Tost is supported by a Massey University Doctoral Scholarship. This work is also supported by the SJC-led New Zealand Natural Hazards Research Platform Project “Living with Volcanic Risk”. We thank the local land owners, in particular Jeff Williams and Rex Martin, for access to their land. We also like to thank Dr JW Vallance and Dr TR Davies for their helpful and thorough reviews of the manuscript.

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  1. Volcanic Risk Solutions, Massey University, Palmerston North, New Zealand

    M. Tost, S. J. Cronin & J. N. Procter

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  1. M. Tost
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  2. S. J. Cronin
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Correspondence to M. Tost.

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Tost, M., Cronin, S.J. & Procter, J.N. Transport and emplacement mechanisms of channelised long-runout debris avalanches, Ruapehu volcano, New Zealand. Bull Volcanol 76, 881 (2014). https://doi.org/10.1007/s00445-014-0881-z

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