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Vol Lecture Notes 7

Pipes 5 pyroclastic flow generation bottom line

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Unformatted text preview: Bottom line: Pyroclastic flows are generally generated in one of two ways Lava dome collapse Peleean & Merapi type flows Generally produces “block and ash flows” Volumes are limited Eruptive Column collapse Generally produces pumice flows or ignimbrites Alternatively “Sourfriere” or “St. Vincent” type flows Large range in volume, from small to extremely large. 6 Types of Block & Ash Flows S t. V in c e n t o r S o u r fr ie r e t y p e Collapse of small eruptive column associated with vulcanian explosion vulcanian More vesiculated than others, but not as vesiculated as pumice flows P e le e a n t y p e Explosive dome collapse Intermediate amounts of vesiculated material M e ra p i t y p e Gravitational dome collapse High proportion of poorly vesiculated material Soufriere Hills Dome Collapse 7 Soufriere Hills Dome Collapse Soufriere Hills Dome Collapse 8 Soufriere Hills Dome Collapse Modeling Column Collapse How do large pyroclastic flows form from column collapse? Why do they move so fast and so far? Model of...
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