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Numerical thermo-mechanical modelling of lava dome growth during the 2007-2009 dome-building eruption at Volcán de Colima

Zeinalova, Natalya 1; Ismail-Zadeh, Alik ORCID iD icon 1; Tsepelev, Igor; Melnik, Oleg; Schilling, Frank
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Lava domes form during effusive eruptions due to an extrusion of highly viscous magmas from volcanic vents. We present here a study of the lava dome growth at Volcán de Colima, Mexico during 2007-2009 using numerical modelling. The mathematical model treats the lava dome extrusion dynamics as a thermo-mechanical problem. The equations of motion, continuity, and heat transfer are solved with the relevant boundary and initial conditions in the assumption that the viscosity depends on the volume fraction of crystals and temperature. Numerical experiments have been performed to analyse the internal structure of the lava dome (i.e., the distributions of the temperature, crystal content, viscosity, and velocity) depending on various heat sources and thermal boundary conditions. It was demonstrated earlier that the lava dome dynamics at Volcán de Colima during short (for a couple of months) dome-building episodes can be modelled by an isothermal lava extrusion with the viscosity depending on the volume fraction of crystals. We show here that cooling plays a significant role during long (up to several years) dome-building episodes. A carapace develops as a response to a convective cooling at the lava dome interface with the air. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000160457
Veröffentlicht am 27.02.2024
DOI: 10.5194/egusphere-egu23-1068
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2023
Sprache Englisch
Identifikator KITopen-ID: 1000160457
Erschienen in EGU23-1068
Veranstaltung European Geosciences Union General Assembly (EGU 2023), Wien, Österreich, 23.04.2023 – 28.04.2023
Verlag Copernicus
Vorab online veröffentlicht am 15.05.2023
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