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Finite-element modeling of magma chamber-host rock interactions prior to caldera collapse

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F17%3A10392424" target="_blank" >RIV/00216208:11310/17:10392424 - isvavai.cz</a>

  • Alternative codes found

    RIV/68407700:21110/17:00311552

  • Result on the web

    <a href="https://doi.org/10.1093/gji/ggx121" target="_blank" >https://doi.org/10.1093/gji/ggx121</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1093/gji/ggx121" target="_blank" >10.1093/gji/ggx121</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Finite-element modeling of magma chamber-host rock interactions prior to caldera collapse

  • Original language description

    Gravity-driven failure of shallow magma chamber roofs and formation of collapse calderas are commonly accompanied by ejection of large volumes of pyroclastic material to the Earth&apos;s atmosphere and thus represent severe volcanic hazards. In this respect, numerical analysis has proven as a key tool in understanding the mechanical conditions of caldera collapse. The main objective of this paper is to find a suitable approach to finite-element simulation of roof fracturing and caldera collapse during inflation and subsequent deflation of shallow magma chambers. Such a model should capture the dominant mechanical phenomena, for example, interaction of the host rock with magma and progressive deformation of the chamber roof. To this end, a comparative study, which involves various representations of magma (inviscid fluid, nearly incompressible elastic, or plastic solid) and constitutive models of the host rock (fracture and plasticity), was carried out. In particular, the quasi-brittle fracture model of host rock reproduced well the formation of tension-induced radial and circumferential fractures during magma injection into the chamber (inflation stage), especially at shallow crustal levels. Conversely, the Mohr-Coulomb shear criterion has shown to be more appropriate for greater depths. Subsequent magma withdrawal from the chamber (deflation stage) results in further damage or even collapse of the chamber roof. While most of the previous studies of caldera collapse rely on the elastic stress analysis, the proposed approach advances modeling of the process by incorporating non-linear failure phenomena and nearly incompressible behaviour of magma. This leads to a perhaps more realistic representation of the fracture processes preceding roof collapse and caldera formation.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10505 - Geology

Result continuities

  • Project

    <a href="/en/project/GAP210%2F12%2F1385" target="_blank" >GAP210/12/1385: Calderas as indicators of thermal-mechanical evolution of subvolcanic magma chambers</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2017

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Geophysical Journal International

  • ISSN

    0956-540X

  • e-ISSN

  • Volume of the periodical

    209

  • Issue of the periodical within the volume

    3

  • Country of publishing house

    GB - UNITED KINGDOM

  • Number of pages

    15

  • Pages from-to

    1851-1865

  • UT code for WoS article

    000408374300035

  • EID of the result in the Scopus database