The 26 December (Boxing Day) 1997 sector collapse and debris avalanche at  Soufriere Hills Volcano

Авторы: Voight B., Komorowski J.C., Norton G.E., Belousov A.B., Belousova M.G., Boudon G., Fransis P.W., Franz W., Heinrich P., Sparks R.S.J, Young S.R.
Журнал: Geological Society Memoir
Том: 21
Год издания: 2002
Первая страница: 363
Последняя страница: 407
Аннотация: The southern sector of Soufriere Hills Volcano failed on 26 December 1997 (Boxing Day), after a year of disturbance culminating in a devastating eruptive episode. Sector collapse produced a c. 50 x l0 6 m 3 volcanic debris avalanche, and depressurized the interior of the lava dome, which exploded to generate a violent pyroclaslic density current. The south-directed growth of a lava lobe and build-up of lava-block talus, since early November 1997. brought the hydrothermally weakened sector to a condition of marginal stability. Limit-equilibrium stability analyses and finite-difference stress-deformation analyses, constrained by geomechanical testing of edifice and debris avalanche materials, suggest that the sector collapse was triggered by a pulse of co-seismic exogenous lava shear-lobe emplacement. Slip-surface localization was influenced by strain-weakening
Добавил в систему: Белоусов Александр Борисович

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