کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4713232 | 1638371 | 2013 | 8 صفحه PDF | دانلود رایگان |
In December 2008/January 2009 a 4-week episode of lava extrusion characterised by rapid dome growth and ground deflation occurred at Soufrière Hills Volcano (SHV), Montserrat W.I. Recorded strain dilatometer data show strain changes up to − 3500 ns during this event. Modelling the collected data assuming existing structural models of the magmatic system, best-fit solutions are obtained for a simultaneous decompression of the shallow and the mid-crustal magma chambers together with a dilation of the shallow dyke-conduit. We interpret our model results as magma ascending from the two chambers into the eruption feeding dyke-conduit and partly extruding at the surface. Dome growth volume estimations from visual observations at SHV fit the extrusion volume inferred from our best-fit model and support our results. The reported data is the first set of geodetic data that documents the dynamic coupling within the entire crustal magmatic system of SHV.
► We analyse new strain data from an extrusion event at Soufrière Hills Volcano.
► Results indicate decompression of the two magma chambers together with dilation of a shallow NW–SE trending dyke.
► The data document for the first time simultaneous dynamic processes within the entire magmatic system.
► Results allow us to constrain the volume ratio of the shallow to the deep reservoir to 1:3.
► During the extrusion event magma ascended from both reservoirs into the shallow dyke and partially up to the surface.
Journal: Journal of Volcanology and Geothermal Research - Volume 250, 15 January 2013, Pages 34–41