Numerical simulation of the last flank-collapse event of Montagne Pelée, Martinique, Lesser Antilles

Details Numerical simulation of the last flank-collapse event of Montagne Pelée, Martinique, Lesser Antilles Numerical simulation of the last flank-collapse event of Montagne Pelée, Martinique, Lesser Antilles

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30b...6l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 2, pp. 6-1, CiteID 1034, DOI 10.1029/2002GL015903

Physics

Geophysics

4

Marine Geology And Geophysics: Marine Sediments-Processes And Transport, Mathematical Geophysics: Modeling, Volcanology: Eruption Mechanisms

Scientific paper

We model the submarine emplacement of a debris avalanche generated by the last flank-collapse event of Montagne Pelée volcano. We estimate the collapsed volume (1.7 km3) using both the volume of the missing material in the horseshoe-shaped structure and the volume of submarine deposits. This avalanche is treated as the gravitational flow of a homogeneous continuum. It is simulated by a finite-difference model, solving mass and momentum conservation equations, that are depth-averaged over the slide thickness. Numerical simulations show that the emplacement of this debris-avalanche can be suitably modeled by a Coulomb-type friction law with a variable friction angle below 10°. We propose that variations of the friction angle are mainly influenced by the thickness of the flowing mass.

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