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SUMMARY:An unusual patient: quantifying 3D deformation around analogue mag
 ma intrusions by using X-ray Computed Tomography - Sam Poppe\, Vrije Unive
 rsiteit Brussel
DTSTART:20181010T110000Z
DTEND:20181010T120000Z
UID:TALK112549@talks.cam.ac.uk
CONTACT:Brendan McCormick Kilbride
DESCRIPTION:Magma intrusions grow to their final geometries by straining t
 he Earth’s crust internally and displacing the Earth’s surface. Interp
 reting that volcanic unrest is key to forecasting a volcanic eruption. Whi
 le scaled laboratory models enable us to study the relationships between s
 urface displacement and intrusion geometry\, past approaches entailed limi
 tations regarding imaging of the model interior or simplicity of the simul
 ated rheology.\n\nThis talk presents results from combining state-of-the-a
 rt wide beam X-ray Computed Tomography (CT) and Digital Volume Correlation
  (DVC) to quantify in 4D the deformation induced in laboratory models by a
 n intrusion of a magma analogue (golden syrup) in a granular Mohr-Coulomb 
 host material (sand and plaster). The evolution of the extracted surface d
 eformation and strain field of the entire experimental volume in 3D over t
 ime shows how contrasting geometries – cryptodomes\, cup shapes\, cone s
 heets and dikes – form in host material of different strength. Moreover\
 , contrasting geometries induce contrasting propagation modes and strain f
 ield characteristics in the host.\n\nOur results demonstrate how the combi
 nation of CT and DVC can greatly enhance the utility of optically non-tran
 sparent crustal rock analogues in obtaining insights into crustal deformat
 ion processes. This unprecedented inside perspective helps understanding t
 he limitations of simple elastic rheology used in geodetic and inversion m
 odeling of crustal deformation processes.
LOCATION: Harker 2\, Department of Earth Sciences\, Downing Street
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