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A Method for Magma Viscosity Assessment by Lava Dome Morphology

Starodubtseva, Yu. V.; Starodubtsev, I. S.; Ismail-Zadeh, A. T. ORCID iD icon 1; Tsepelev, I. A.; Melnik, O. E.; Korotkii, A. I.
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract:

Lava domes form when a highly viscous magma erupts on the surface. Several types of lava dome morphology can be distinguished depending on the flow rate and the rheology of magma: obelisks, lava lobes, and endogenic structures. The viscosity of magma nonlinearly depends on the volume fraction of crystals and temperature. Here we present an approach to magma viscosity estimation based on a comparison of observed and simulated morphological forms of lava domes. We consider a two-dimensional axisymmetric model of magma extrusion on the surface and lava dome evolution, and assume that the lava viscosity depends only on the volume fraction of crystals. The crystallization is associated with a growth of the liquidus temperature due to the volatile loss from the magma, and it is determined by the characteristic time of crystal content growth (CCGT) and the discharge rate. Lava domes are modeled using a finite-volume method implemented in Ansys Fluent software for various CCGTs and volcanic vent sizes. For a selected eruption duration a set of morphological shapes of domes (shapes of the interface between lava dome and air) is obtained. Lava dome shapes modeled this way are compared with the observed shape of the lava dome (synthesized in the study by a random modification of one of the calculated shapes). ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000133785
Veröffentlicht am 11.06.2021
Originalveröffentlichung
DOI: 10.1134/S0742046321030064
Scopus
Zitationen: 4
Web of Science
Zitationen: 2
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2021
Sprache Englisch
Identifikator ISSN: 0742-0463, 1819-7108
KITopen-ID: 1000133785
HGF-Programm 38.04.04 (POF IV, LK 01) Geoenergy
Erschienen in Journal of volcanology and seismology
Verlag Springer Verlag
Band 15
Heft 3
Seiten 159–168
Nachgewiesen in Scopus
Dimensions
Web of Science
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