On 30 December 2002 a submarine landslide generated high tsunami waves and destabilized the subaerial slope of the NW flank of the Stromboli volcanic island. The volcano flank is a large subaerial and subaqueous scar filled by loose volcaniclastic materials. Their susceptibility to undrained shear failure is investigated through stress- and displacement-controlled large-scale ring shear tests (LRST), conducted at DPRI-Kyoto University at different hydraulic boundary conditions. Results are presented in the form of stress paths and time-histories of shear resistance and pore pressures and are discussed with reference to the different teting conditions. Finally shear band formed in LRST are analyzed in terms of changes in porosity and grain size distribution in order to investigate the development of grain crushing at failure and at large displacement.

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