Hotstuff seminar - Sam Popp - Vrije Universiteit Brussel - An unusual patient: quantifying magma intrusion-induced displacement and strain in 4D in laboratory experiments by using X-ray Computed Tomography
Mr Sam Popp
Room G8, School of Earth Sciences, Wills Memorial Building
We are pleased to welcome Mr Sam Popp from the Vrije Universiteit Brussel who will be delivering this week's Hotstuff Seminar:-
Title: An unusual patient: quantifying magma intrusion-induced displacement and strain in 4D in laboratory experiments by using X-ray Computed Tomography
Magma intrusions grow to their final geometries by straining the Earth’s crust internally and displacing the Earth’s surface. Interpreting that volcanic unrest is key to forecasting a volcanic eruption. While scaled laboratory models enable us to study the relationships between surface displacement and intrusion geometry, past approaches entailed limitations regarding imaging of the model interior or simplicity of the simulated rheology.
This talk presents results from combining state-of-the-art wide beam X-ray Computed Tomography (CT) and Digital Volume Correlation (DVC) to quantify in 4D the deformation induced in laboratory models by an intrusion of a magma analogue (golden syrup) in a granular Mohr-Coulomb host material (sand and plaster). The evolution of the extracted surface deformation and strain field of the entire experimental volume in 3D over time shows how contrasting geometries – cryptodomes, cup shapes, cone sheets and dikes – form in host material of different strength. Moreover, contrasting geometries induce contrasting propagation modes and strain field characteristics in the host.
Our results demonstrate how the combination of CT and DVC can greatly enhance the utility of optically non-transparent crustal rock analogues in obtaining insights into crustal deformation processes. This unprecedented inside perspective helps understanding the limitations of simple elastic rheology used in geodetic and inversion modeling of crustal deformation processes.
All staff and students welcome.
For further information, please contact Frances Boreham.