Jamie Farquharson

TL;DR: In this paper, the authors measured field porosity in the range of 10 −16 to 10 −11 m 2, encompassing values significantly greater than those generally assumed for fluid transport inmagma, and emphasising the importance of host-rock permeability in facilitating outgassing of volatiles and, in turn, governing eruption dynamics.

TL;DR: The experiments show that, at shallow depths, both low- and high-porosity lavas dilate and fail by shear fracturing, but deeper in the edifice, the failure of high- porosity lava is compactant and driven by cataclastic pore collapse, and the implication of these data is that sidewall outgassing may be efficient in the shallow Edifice, where rock can fracture, but may be impeded deeper inThe edifice due to compaction.

TL;DR: In this article, a multidisciplinary study aims to better understand the porosity of active volcanic hydrothermal systems, a vital prerequisite for modelling and understanding their behaviour and evolution.

TL;DR: In this paper, the authors present uniaxial and triaxial compression experiments designed to investigate the breadth of mechanical behaviour and failure modes (dilatant or compactant) for hydrothermally-altered lava and ash tuff deposits from Whakaari (White Island volcano) in New Zealand, a volcano with a well-documented and very active hydrothermal system.

TL;DR: In this article, the authors present a wealth of laboratory data and suggest tools, widely used in geotechnics but adapted here to better suit volcanic rocks, to upscale these values to the scale of a volcanic rock mass.