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Book Chapter

MAGFLOW: a physics-based model for the dynamics of lava-flow emplacement

By
Annalisa Cappello
Annalisa Cappello
1
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo, 95125 Catania, Italy
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Alexis Hérault
Alexis Hérault
1
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo, 95125 Catania, Italy
2
Département Ingénierie Mathématique, Conservatoire des Arts et Métiers, Paris, France
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Giuseppe Bilotta
Giuseppe Bilotta
1
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo, 95125 Catania, Italy
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Gaetana Ganci
Gaetana Ganci
1
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo, 95125 Catania, Italy
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Ciro Del Negro
Ciro Del Negro
1
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo, 95125 Catania, Italy
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Published:
January 01, 2016

Abstract

The MAGFLOW model for lava-flow simulations is based on the cellular automaton (CA) approach, and uses a physical model for the thermal and rheological evolution of the flowing lava. We discuss the potential of MAGFLOW to improve our understanding of the dynamics of lava-flow emplacement and our ability to assess lava-flow hazards. Sensitivity analysis of the input parameters controlling the evolution function of the automaton demonstrates that water content and solidus temperatures are the parameters to which MAGFLOW is most sensitive. Additional tests also indicate that temporal changes in effusion rate strongly influence the accuracy of the predictive modelling of lava-flow paths. The parallel implementation of MAGFLOW on graphic processing units (GPUs) can achieve speed-ups of two orders of magnitude relative to the corresponding serial implementation, providing a lava-flow simulation spanning several days of eruption in just a few minutes. We describe and demonstrate the operation of MAGFLOW using two case studies from Mt Etna: one is a reconstruction of the detailed chronology of the lava-flow emplacement during the 2006 flank eruption; and the other is the production of the lava-flow hazard map of the persistent eruptive activity at the summit craters.

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Contents

Geological Society, London, Special Publications

Detecting, Modelling and Responding to Effusive Eruptions

A. J. L. Harris
A. J. L. Harris
Université Blaise Pascal, France
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T. De Groeve
T. De Groeve
Joint Research Centre of the European Commission, Italy
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F. Garel
F. Garel
Université de Montpellier, France
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S. A. Carn
S. A. Carn
Michigan Technological University, USA
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Geological Society of London
Volume
426
ISBN electronic:
9781862399587
Publication date:
January 01, 2016

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