Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3421310e&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 21, CiteID L21310
Physics
6
Volcanology: Effusive Volcanism, Volcanology: Explosive Volcanism, Volcanology: Volcanic Gases, Volcanology: Magma Migration And Fragmentation, Volcanology: Eruption Mechanisms And Flow Emplacement
Scientific paper
A sequence of five Vulcanian explosions followed a lava dome collapse in July 2003 at Soufrière Hills Volcano. Each explosion occurred at ~t = 190 n 4.3 where n = 1-5 and t is the time (s) since the decompression rate peak during the collapse. Instead of a sixth explosion at the predicted time, a rapid emission of 97 × 103 kg SO2 was observed by a spectrometer network. This event represents the transition from explosive to effusive activity. After the last explosion, high magma ascent rates were maintained, but the critical overpressure explosion criterion was not reached. Instead, degassing and crystallisation in the upper conduit caused horizontal gradients in viscosity and flow rate, and brittle failure at the walls when the rate of shear strain exceeded a critical value. Development of a permeable shear zone allowed gas release, relief of overpressure and a return to effusive lava-dome building.
Edmonds Marie
Herd Richard A.
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