Other
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3429r&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 18, p. 3429-3432
Other
26
Volcanology: Magma Migration, Volcanology: Ash Deposits, Volcanology: Eruption Mechanisms
Scientific paper
On 17 September 1996 the Soufriere Hills Volcano started a 9 hour period of dome collapse involving 11.7×106m3 (DRE) of lava. After 2.5 hours of quiescence a sustained explosive eruption began. Estimated eruption parameters are: plume height at least 11.3 km and a maximum of 15 km; 180 m/s for launch velocities of ballistic clasts; peak explosion pressure of 27.5 MPa; magma water contents of 2.5-5% magma discharge rates from 2300 to 4300 m3/s; ejecta volume of 3.2(+/-0.9)×106m3 (DRE). Ejecta consists of pumice (ρ=1160kg/m3), higher density vesiculated ejecta (ρ=1300 to 2000 kg/m3), dense glassy clasts (ρ=2600kg/m3), breccias cut by tuffisite veins and hydrothermally altered lithics. The ejecta are interpreted as a conduit assemblage with evacuation of the conduit down to depths of about 3 to 5 km. The eruption was triggered by unloading of a gas pressurised conduit due to dome collapse.
Cole Philip
Harford C.
LeJeune Anne-Marie
McGuire William J.
Miller Amber D.
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