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- W1996075316 abstract "Lava dome eruptions are sometimes characterised by large periodic fluctuations in extrusion rate over periods of hours that may be accompanied by Vulcanian explosions and pyroclastic flows. We consider a simple system of nonlinear equations describing a 1D flow of lava extrusion through a deep elastic dyke feeding a shallower cylindrical conduit in order to simulate this short-period cyclicity. Stick-slip conditions depending on a critical shear stress are assumed at the wall boundary of the cylindrical conduit. By analogy with the behaviour of industrial polymers in a plastic extruder, the elastic dyke acts like a barrel and the shallower cylindrical portion of the conduit as a die for the flow of magma acting as a polymer. When we applied the model to the Soufrière Hills Volcano, Montserrat, for which the key parameters have been evaluated from previous studies, cyclic extrusions with periods from 3 to 30 h were readily simulated, matching observations. The model also reproduces the reduced period of cycles observed when a major unloading event occurs due to lava dome collapse." @default.
- W1996075316 created "2016-06-24" @default.
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- W1996075316 date "2012-07-01" @default.
- W1996075316 modified "2023-10-16" @default.
- W1996075316 title "Cyclic extrusion of a lava dome based on a stick-slip mechanism" @default.
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- W1996075316 doi "https://doi.org/10.1016/j.epsl.2012.05.011" @default.
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