Unveiling the Rheological Control of Magmatic Systems on Volcano Deformation: The Interplay of Poroviscoelastic Magma‐Mush and Thermo‐Viscoelastic Crust

Abstract

An increasing number of studies suggest that subvolcanic melt reservoirs are dominated by magma "mush" consisting of a semi-rigid framework of crystals with interstitial melt (

Pressurizing Magma Within Heterogeneous Crust: A Case Study at the Socorro Magma Body, New Mexico, USA

“…(2018), Mullet and Segall (2022), and Alshembari et al. (2023). These studies explore interactions in a single melt injection/withdrawal event, however, our models highlight the importance of cyclic pressure‐time variations, especially when a CR is present, in decoupled surface deformation.…”

“…In future work, we hope to include heat transfer and poro(visco)-elastic effects to more fully explore CR heterogeneity and implications for magma-mush interactions. During time-variable pressurization in the sill, as magma is either sourced from deeper levels or drained from a mush, we might expect time-dependent rheology in the CR as explored in Liao et al (2021), Liao et al (2018), Mullet andSegall (2022), andAlshembari et al (2023). These studies explore interactions in a single melt injection/withdrawal event, however, our models highlight the importance of cyclic pressure-time variations, especially when a CR is present, in decoupled surface deformation.…”

“…Within them, the formation of crystal‐poor (<50% crystals by volume) eruptible magma (e.g., Hughes et al., 2021) by heat and mass transfer is the subject of multidisciplinary exploration (e.g., Bergantz et al., 2015; F. Costa et al., 2020). Magma‐mush interactions have been modeled as (visco)poroelastic coupling over length scales of intrusions (Alshembari et al., 2023; Liao et al., 2018, 2021; Mullet & Segall, 2022), or permeable flow and transport (Liu & Lee, 2021), possibly including the effects of volatiles (e.g., Parmigiani et al., 2014).…”

Fracturing and tectonic stress drive ultrarapid magma flow into dikes

“…For these numbers and a crustal shear modulus of 10 GPa ( 25 ), the pressure drop associated with the inferred 10 to 12 November magma domain deflation volume (∼80 × 10 6 m 3 ) was –21 MPa, and for the cumulative inflation volume prior to diking of ∼23 × 10 6 m 3 , it was 6 MPa. However, some of the pressure buildup associated with the inflation episodes may have been partly relaxed by viscoelastic or poroviscoelastic relaxation ( 30 – 32 ). Observed deflation following previous Svartsengi inflations (fig.…”

Inversions of Surface Displacements in Scaled Experiments of Analog Magma Intrusion

“…The accuracy of model results is instead verified against independent geological knowledge of the volcano and geophysical monitoring data, themselves obtained indirectly by models that require their own assumptions. Numerical simulations of the temporal evolution of deformation patterns show that the rheological assumptions made by analytical models significantly impact the stress and displacement patterns induced by magma intrusions (Alshembari et al., 2023; Daniels et al., 2012; Got et al., 2019; Walker & Gill, 2020). Nonetheless, geodetic inversions typically rely on static analytical models that do not account for that temporal evolution.…”