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Bulletin of Volcanology

, Volume 72, Issue 8, pp 933–944 | Cite as

Runout of the Socompa volcanic debris avalanche, Chile: a mechanical explanation for low basal shear resistance

  • Tim Davies
  • Mauri McSaveney
  • Karim Kelfoun
Research Article

Abstract

We propose a mechanical explanation for the low basal shear resistance (about 50 kPa) previously used to simulate successfully the complex, well-documented deposit morphology and lithological distribution produced by emplacement of the 25 km3 Socompa volcanic debris avalanche deposit, Chile. Stratigraphic evidence for intense basal comminution indicates the occurrence of dynamic rock fragmentation in the basal region of this large granular mass flow, and we show that such fragmentation generates a basal shear stress, retarding motion of the avalanche, that is a function of the flow thickness and intact rock strength. The topography of the Socompa deposit is realistically simulated using this fragmentation-derived resistance function. Basal fragmentation is also compatible with the evidence from the deposit that reflection of the avalanche from topography caused a secondary wave that interacted with the primary flow.

Keywords

Volcanic debris avalanche Socompa deposit Runout simulation Dynamic fragmentation Retarding stress Debris avalanche reflection Deposit morphology 

Nomenclatures

Ff

proportion (by volume) of grains fragmenting simultaneously

k1, k2

constants

O[ ]

of the order of

PC

minimum value needed to cause fragmentation

PE

spatially-averaged effective intergranular direct stress within the fragmenting layer

Pfa

apparent fragmenting pressure

P′f

spatially-averaged fragmentation pressure in the fragmenting layer; mean longitudinal fragmentation pressure.

POB

direct stress on the top of the fragmenting layer

PR

frictional resistance in a fragmenting granular flow

Q

intact static compressive strength

μ

dynamic friction coefficient

Notes

Acknowledgements

We gratefully acknowledge constructive reviews by Charles Campbell, Emily Brodsky and Jeremy Phillips.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Geological SciencesUniversity of CanterburyChristchurchNew Zealand
  2. 2.GNS Science LtdLower HuttNew Zealand
  3. 3.Laboratoire Magmas et Volcans, OPGC, UMR Clermont Université-CNRS-IRDClermont-FerrandFrance

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