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Numerical models of caldera deformation: Effects of multiphase and multicomponent hydrothermal fluid flow

Identifieur interne : 000095 ( Main/Exploration ); précédent : 000094; suivant : 000096

Numerical models of caldera deformation: Effects of multiphase and multicomponent hydrothermal fluid flow

Auteurs : M. Hutnak [États-Unis] ; S. Hurwitz [États-Unis] ; S. E. Ingebritsen [États-Unis] ; P. A. Hsieh [États-Unis]

Source :

RBID : ISTEX:938FCC2BE49FA120B3F4BA0E37138AB75CDF42D0

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English descriptors

Abstract

Ground surface displacement (GSD) in large calderas is often interpreted as resulting from magma intrusion at depth. Recent advances in geodetic measurements of GSD, notably interferometric synthetic aperture radar, reveal complex and multifaceted deformation patterns that often require complex source models to explain the observed GSD. Although hydrothermal fluids have been discussed as a possible deformation agent, very few quantitative studies addressing the effects of multiphase flow on crustal mechanics have been attempted. Recent increases in the power and availability of computing resources allow robust quantitative assessment of the complex time‐variant thermal interplay between aqueous fluid flow and crustal deformation. We carry out numerical simulations of multiphase (liquid‐gas), multicomponent (H2O–CO2) hydrothermal fluid flow and poroelastic deformation using a range of realistic physical parameters and processes. Hydrothermal fluid injection, circulation, and gas formation can generate complex, temporally and spatially varying patterns of GSD, with deformation rates, magnitudes, and geometries (including subsidence) similar to those observed in several large calderas. The potential for both rapid and gradual deformation resulting from magma‐derived fluids suggests that hydrothermal fluid circulation may help explain deformation episodes at calderas that have not culminated in magmatic eruption.

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DOI: 10.1029/2008JB006151


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<term>Aperture radar</term>
<term>Average rate</term>
<term>Basal heat flux</term>
<term>Battaglia</term>
<term>Boundary conditions</term>
<term>Broad region</term>
<term>Caldera</term>
<term>Caldera center</term>
<term>Caldera deformation</term>
<term>Caldera deformation figure</term>
<term>Campi flegrei caldera</term>
<term>Carbon dioxide</term>
<term>Chiodini</term>
<term>Coexistence curves</term>
<term>Constant fluid injection</term>
<term>Constant heat flux</term>
<term>Continental crust</term>
<term>Crust</term>
<term>Crustal</term>
<term>Crustal deformation</term>
<term>Crustal permeability</term>
<term>Cumulative deformation</term>
<term>Deformation</term>
<term>Deformation decreases</term>
<term>Deformation patterns</term>
<term>Depth range</term>
<term>Dzurisin</term>
<term>Earth planet</term>
<term>Elastic moduli</term>
<term>Fluid</term>
<term>Fluid flow</term>
<term>Fluid injection</term>
<term>Fluid injection rates</term>
<term>Fluid migration</term>
<term>Fluid sourcing</term>
<term>Fluxes peak</term>
<term>Geological survey</term>
<term>Geophys</term>
<term>Geotherm</term>
<term>Gray shading</term>
<term>Ground deformation</term>
<term>Ground surface</term>
<term>Ground surface displacement</term>
<term>Highest injection rate</term>
<term>Highest injection rates</term>
<term>Host rock</term>
<term>Hurwitz</term>
<term>Hutnak</term>
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<term>Hydrothermal fluid circulation</term>
<term>Hydrothermal fluid flow</term>
<term>Hydrothermal fluids</term>
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<term>Hydrothermal systems</term>
<term>Hydrothermal zone</term>
<term>Injection</term>
<term>Injection area</term>
<term>Injection rate</term>
<term>Intrusion</term>
<term>Large calderas</term>
<term>Local subsidence</term>
<term>Local uplift</term>
<term>Localized uplift</term>
<term>Long valley</term>
<term>Long valley caldera</term>
<term>Magma</term>
<term>Magma intrusion</term>
<term>Magmatic</term>
<term>Magmatic intrusion</term>
<term>Maximum values</term>
<term>Menlo park</term>
<term>Millennial timescales</term>
<term>Model domain</term>
<term>Model results</term>
<term>Modulus</term>
<term>Mono craters</term>
<term>Multicomponent</term>
<term>Multicomponent hydrothermal fluid flow</term>
<term>Multicomponent simulation</term>
<term>Multicomponent simulations</term>
<term>Multicomponent system</term>
<term>Multifaceted deformation patterns</term>
<term>Multiphase</term>
<term>Multiphase flow</term>
<term>Multiphase fluid flow</term>
<term>Multiphase systems</term>
<term>Natural systems</term>
<term>Negative uplift rates</term>
<term>Numerical model</term>
<term>Numerical models</term>
<term>Numerical simulations</term>
<term>Other phase</term>
<term>Overlying hydrothermal system</term>
<term>Permeability</term>
<term>Phlegrean fields</term>
<term>Point source</term>
<term>Poroelastic deformation</term>
<term>Poroelastic effects</term>
<term>Present study</term>
<term>Pressure increases</term>
<term>Pressure range</term>
<term>Production data</term>
<term>Pure water system</term>
<term>Radial</term>
<term>Radial distance</term>
<term>Radial distances</term>
<term>Radial extent</term>
<term>Radial extents</term>
<term>Radially</term>
<term>Recent advances</term>
<term>Relative permeabilities</term>
<term>Relative permeability</term>
<term>Separate convection cells</term>
<term>Shallow crust</term>
<term>Shallow depths</term>
<term>Shallow hydrothermal system</term>
<term>Shear modulus</term>
<term>Show system evolution</term>
<term>Simulation</term>
<term>Simulation years</term>
<term>Source configurations</term>
<term>Sourcing</term>
<term>Spatial evolution</term>
<term>Subsequent circulation</term>
<term>Subsidence</term>
<term>Temporal variability</term>
<term>Thermal expansion</term>
<term>Thick lines</term>
<term>Thick lines show model results</term>
<term>Thin lines show results</term>
<term>Todesco</term>
<term>Uplift</term>
<term>Uplift rate</term>
<term>Uplift rates</term>
<term>Upper boundary</term>
<term>Vertical extent</term>
<term>Volcano</term>
<term>Volcano deformation</term>
<term>Volcano geodesy</term>
<term>Volcanol</term>
<term>Yellowstone</term>
<term>Yellowstone caldera</term>
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<term>Aperture radar</term>
<term>Average rate</term>
<term>Basal heat flux</term>
<term>Battaglia</term>
<term>Boundary conditions</term>
<term>Broad region</term>
<term>Caldera</term>
<term>Caldera center</term>
<term>Caldera deformation</term>
<term>Caldera deformation figure</term>
<term>Campi flegrei caldera</term>
<term>Carbon dioxide</term>
<term>Chiodini</term>
<term>Coexistence curves</term>
<term>Constant fluid injection</term>
<term>Constant heat flux</term>
<term>Continental crust</term>
<term>Crust</term>
<term>Crustal</term>
<term>Crustal deformation</term>
<term>Crustal permeability</term>
<term>Cumulative deformation</term>
<term>Deformation</term>
<term>Deformation decreases</term>
<term>Deformation patterns</term>
<term>Depth range</term>
<term>Dzurisin</term>
<term>Earth planet</term>
<term>Elastic moduli</term>
<term>Fluid</term>
<term>Fluid flow</term>
<term>Fluid injection</term>
<term>Fluid injection rates</term>
<term>Fluid migration</term>
<term>Fluid sourcing</term>
<term>Fluxes peak</term>
<term>Geological survey</term>
<term>Geophys</term>
<term>Geotherm</term>
<term>Gray shading</term>
<term>Ground deformation</term>
<term>Ground surface</term>
<term>Ground surface displacement</term>
<term>Highest injection rate</term>
<term>Highest injection rates</term>
<term>Host rock</term>
<term>Hurwitz</term>
<term>Hutnak</term>
<term>Hydrothermal</term>
<term>Hydrothermal fluid circulation</term>
<term>Hydrothermal fluid flow</term>
<term>Hydrothermal fluids</term>
<term>Hydrothermal phenomena</term>
<term>Hydrothermal system</term>
<term>Hydrothermal systems</term>
<term>Hydrothermal zone</term>
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<term>Injection area</term>
<term>Injection rate</term>
<term>Intrusion</term>
<term>Large calderas</term>
<term>Local subsidence</term>
<term>Local uplift</term>
<term>Localized uplift</term>
<term>Long valley</term>
<term>Long valley caldera</term>
<term>Magma</term>
<term>Magma intrusion</term>
<term>Magmatic</term>
<term>Magmatic intrusion</term>
<term>Maximum values</term>
<term>Menlo park</term>
<term>Millennial timescales</term>
<term>Model domain</term>
<term>Model results</term>
<term>Modulus</term>
<term>Mono craters</term>
<term>Multicomponent</term>
<term>Multicomponent hydrothermal fluid flow</term>
<term>Multicomponent simulation</term>
<term>Multicomponent simulations</term>
<term>Multicomponent system</term>
<term>Multifaceted deformation patterns</term>
<term>Multiphase</term>
<term>Multiphase flow</term>
<term>Multiphase fluid flow</term>
<term>Multiphase systems</term>
<term>Natural systems</term>
<term>Negative uplift rates</term>
<term>Numerical model</term>
<term>Numerical models</term>
<term>Numerical simulations</term>
<term>Other phase</term>
<term>Overlying hydrothermal system</term>
<term>Permeability</term>
<term>Phlegrean fields</term>
<term>Point source</term>
<term>Poroelastic deformation</term>
<term>Poroelastic effects</term>
<term>Present study</term>
<term>Pressure increases</term>
<term>Pressure range</term>
<term>Production data</term>
<term>Pure water system</term>
<term>Radial</term>
<term>Radial distance</term>
<term>Radial distances</term>
<term>Radial extent</term>
<term>Radial extents</term>
<term>Radially</term>
<term>Recent advances</term>
<term>Relative permeabilities</term>
<term>Relative permeability</term>
<term>Separate convection cells</term>
<term>Shallow crust</term>
<term>Shallow depths</term>
<term>Shallow hydrothermal system</term>
<term>Shear modulus</term>
<term>Show system evolution</term>
<term>Simulation</term>
<term>Simulation years</term>
<term>Source configurations</term>
<term>Sourcing</term>
<term>Spatial evolution</term>
<term>Subsequent circulation</term>
<term>Subsidence</term>
<term>Temporal variability</term>
<term>Thermal expansion</term>
<term>Thick lines</term>
<term>Thick lines show model results</term>
<term>Thin lines show results</term>
<term>Todesco</term>
<term>Uplift</term>
<term>Uplift rate</term>
<term>Uplift rates</term>
<term>Upper boundary</term>
<term>Vertical extent</term>
<term>Volcano</term>
<term>Volcano deformation</term>
<term>Volcano geodesy</term>
<term>Volcanol</term>
<term>Yellowstone</term>
<term>Yellowstone caldera</term>
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<front>
<div type="abstract">Ground surface displacement (GSD) in large calderas is often interpreted as resulting from magma intrusion at depth. Recent advances in geodetic measurements of GSD, notably interferometric synthetic aperture radar, reveal complex and multifaceted deformation patterns that often require complex source models to explain the observed GSD. Although hydrothermal fluids have been discussed as a possible deformation agent, very few quantitative studies addressing the effects of multiphase flow on crustal mechanics have been attempted. Recent increases in the power and availability of computing resources allow robust quantitative assessment of the complex time‐variant thermal interplay between aqueous fluid flow and crustal deformation. We carry out numerical simulations of multiphase (liquid‐gas), multicomponent (H2O–CO2) hydrothermal fluid flow and poroelastic deformation using a range of realistic physical parameters and processes. Hydrothermal fluid injection, circulation, and gas formation can generate complex, temporally and spatially varying patterns of GSD, with deformation rates, magnitudes, and geometries (including subsidence) similar to those observed in several large calderas. The potential for both rapid and gradual deformation resulting from magma‐derived fluids suggests that hydrothermal fluid circulation may help explain deformation episodes at calderas that have not culminated in magmatic eruption.</div>
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