%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Dondin, F.
%A Lebrun, J. F.
%A Kelfoun, Karim
%A Fournier, N.
%A Randrianasolo, A.
%T Sector collapse at Kick 'em Jenny submarine volcano (Lesser Antilles) : numerical simulation and landslide behaviour
%D 2012
%L fdi:010055709
%G ENG
%J Bulletin of Volcanology
%@ 0258-8900
%K Kick 'em Jenny ; Sector collapse ; Submarine landslide ; Numerical modelling ; Rheology ; VolcFlow ; Lesser Antilles
%M ISI:000300577200019
%N 2
%P 595-607
%R 10.1007/s00445-011-0554-0
%U https://www.documentation.ird.fr/hor/fdi:010055709
%> https://www.documentation.ird.fr/intranet/publi/2012/04/010055709.pdf
%V 74
%W Horizon (IRD)
%X Kick 'em Jenny volcano is the only known active submarine volcano in the Lesser Antilles. It lies within a horseshoe-shaped structure open to the west northwest, toward the deep Grenada Basin. A detailed bathymetric survey of the basin slope at Kick 'em Jenny and resulting high-resolution digital elevation model allowed the identification of a major submarine landslide deposit. This deposit is thought to result from a single sector collapse event at Kick 'em Jenny and to be linked to the formation of the horseshoe-shaped structure. We estimated the volume and the leading-edge runout of the landslide to be ca. 4.4 km(3) and 14 km, respectively. We modelled a sector collapse event of a proto Kick 'em Jenny volcano using VolcFlow, a finite difference code based on depth-integrated mass and momentum equations. Our models show that the landslide can be simulated by either a Coulomb-type rheology with low basal friction angles (5.5A degrees-6.5A degrees) and a significant internal friction angle (above 17.5A degrees) or, with better results, by a Bingham rheology with low Bingham kinematic viscosity (0 < nu (B) < 30 m(2)/s) and high shear strength (130 < I-3 a parts per thousand currency signaEuro parts per thousand 180 m(2)/s(2)). The models and the short runout distance suggest that the landslide travelled as a stiff cohesive flow affected by minimal granular disaggregation and slumping on a non-lubricated surface. The main submarine landslide deposit can therefore be considered as a submarine mass slide deposit that behaved like a slump.
%$ 064 ; 020