Dual-chamber-conduit models of non-linear dynamics behaviour at Soufrière Hills Volcano, Montserrat
Published:January 01, 2014
Oleg Melnik, Antonio Costa, 2014. "Dual-chamber-conduit models of non-linear dynamics behaviour at Soufrière Hills Volcano, Montserrat", The Eruption of Soufrière Hills Volcano, Montserrat from 2000 to 2010, G. Wadge, R. E. A. Robertson, B. Voight
Download citation file:
Modern geophysical data recorded during lava dome building eruptions indicate the presence of multiple connected magma storage regions. Most numerical models for lava dome eruptions assume a single magma chamber fed from below with a constant or prescribed time dependent influx rate and connected to the Earth surface through a conduit.
Here we present a development of the model of extrusive eruptions considering a system made of two magma chambers located in elastic rocks and connected by a dyke between each other. We use locations and volumes of the magma chambers inferred for Soufrière Hills Volcano, Montserrat from ground deformation studies and seismic tomography.
The model shows cyclic behaviour with a period that depends on the intensity of the influx rate, the volumes and shape of the two chambers and the degree of connectivity of the two reservoirs. For a weak connectivity the overpressure in the lower chamber stays nearly constant during the cycle and the influx of fresh magma into the shallow chamber is also nearly constant. For a strong connectivity between the chambers their overpressure increases or decreases during the cycle in a synchronous way.
Figures & Tables
The Eruption of Soufrière Hills Volcano, Montserrat from 2000 to 2010
The 1995 to present eruption of Soufrière Hills Volcano on Montserrat is one of the most important and best-studied eruptions of an explosive andesitic volcano. This volume presents scientific findings from the period between 2000 and 2010; it follows on from Memoir 21, which focused on the early years of activity between 1995 and 1999. In addition to descriptions and analysis of the growth, collapse and explosions associated with lava domes, there are papers on the deformation of the volcano caused by the deep magma, the petrology and geochemistry of the lavas and associated gases. Of particular note are: an overview of the insights into the deep structure of the volcano that resulted from a major international seismic tomography experiment; and an analysis of the quantitative risk assessment process that has run now for most of the eruption, the longest such continuous assessment in the world.