Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4572
AuthorsPapale, P.* 
Longo, A.* 
TitleVent conditions for expected eruptions at Vesuvius
Issue Date2008
Series/Report no.3/178 (2008)
DOI10.1016/j.jvolgeores.2008.05.012
URIhttp://hdl.handle.net/2122/4572
KeywordsVesuvius
Numerical simulations
Vent conditions
Volcanic hazard
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.03. Magmas 
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 
AbstractDetermining consistent sets of vent conditions for next expected eruptions at Vesuvius is crucial for the simulation of the sub-aerial processes originating the volcanic hazard and the eruption impact. Herewerefer to the expected eruptive scales and conditions defined in the frame of the EC Exploris project, and simulate the dynamics of magma ascent along the volcanic conduit for sub-steady phases of next eruptions characterized by intensities of the Violent Strombolian (VS), Sub-Plinian 2 (SP2), and Sub-Plinian 1 (SP1) scale. Sets of conditions for the simulations are determined on the basis of the bulk of knowledge on the past history of Vesuvius [Cioni, R., Bertagnini, A., Santacroce, R., Andronico, D., Explosive activity and eruption scenarios at Somma–Vesuvius (Italy): towards a new classification scheme. Journal of Volcanology and Geothermal Research, this issue.]. Volatile contents (H2O and CO2) are parameterized in order to account for the uncertainty in their expected amounts for a next eruption. In all cases the flow in the conduit is found to be choked, with velocities at the conduit exit or vent corresponding to the sonic velocity in the two-phase non-equilibrium magmatic mixture. Conduit diameters and vent mixture densities are found to display minimum overlapping between the different eruptive scales, while exit gas and particle velocities, as well as vent pressures, largely overlap. Vent diameters vary from as low as about 5 m for VS eruptions, to 35–55 m for the most violent SP1 eruption scale. Vent pressures can be as low as less than 1 MPa for the lowest volatile content employed of 2 wt.% H2O and no CO2, to 7–8 MPa for highest volatile contents of 5 wt.% H2O and 2 wt.% CO2 and large eruptive scales. Gas and particle velocities at the vent range from 100–250 m/s, with a tendency to decrease, and to increase the mechanical decoupling between the phases, with increasing eruptive scale. Except for velocities, all relevant vent quantities are more sensitive to the volatile content of the discharged magma for the highest eruptive scales considered.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
JVGR_PP_Papale et al_2008.pdf397.11 kBAdobe PDFView/Open
Show full item record

Page view(s)

73
Last Week
0
Last month
checked on Jun 27, 2017

Download(s)

19
checked on Jun 27, 2017

Google ScholarTM

Check

Altmetric