Alumni
Helgi-Eggertsson-2.jpg

Guðjón Helgi Eggertsson

'Constrain the mechanics and permeability of the rocks at Krafla and seek ways to increase the permeability of the reservoir to enhance productivity of the exploited geothermic wells'
Institute of Risk and Uncertainty and Landsvirkjun Energy Research Fund
Supervisors: Yan Lavallée and Andreas Rietbrock
Description: The goal of my project is to constrain the mechanics of the reservoir rocks in the Krafla geothermal system. The experimental work will describe the response of the lithologies at Krafla to different conditions of stress and temperature, and will constrain the permeability of the reservoir rocks (intact & broken) at natural conditions. This constraint will seek to solve the knowledge gap on “hot rock permeability” for more efficient exploitation of the Krafla reservoir. The study further aims to describe how fluid flow efficiency of the reservoir rock increases with thermal stimulation by water injection as well as during tectonic rifting events. - Email Guðjón

Becky Coats

Rebecca Coats

'Deformation mechanisms in magmas: A crystal constraint'
European Research Council Project: Strain Localisation in Magma (SLiM)
Supervisors: Yan Lavallée, Silvio De Angelis and Jackie Kendrick
Description: Volcanic eruptions are primarily controlled by the rheology of ascending magma which is, in turn, determined by its composition as well as its crystal and volatile contents. My project aims to evaluate the controls on deformation mechanisms while also looking at the role of volatiles and crystals during magma ascent. Previous studies have found that crystals affect rheology even more strongly than bubbles; however descriptions of their influence on magma rheology are incomplete. Analytical, experimental and field work analysis will be used to constrain crystal plasticity and crystal stability observed in lava domes and shallow conduit structures. Characterisation of the influences on rheology will be used to enhance our knowledge of volcanic precursors, which aid the forecasting of volcanic eruptions. - Email Rebecca

Anthony Lamur

Anthony Lamur

'Development impact and longevity of fractures in magmatic, volcanic and geothermal systems'
European Research Council Project: Strain Localisation in Magma (SLiM)
Supervisors: Yan Lavallée, Jackie Kendrick and Silvio de Angelis
Description: Disruption of volcanic domes can lead to dramatic explosive eruptions. Whether an applied stress or deformation is able to disrupt these features is partly controlled by the glass content of high silica content magmas. The lab-based part of my PhD focuses on the mechanics of glass (natural and synthetic) during fracturing and healing cycles. I will try to upscale my results to Ceboruco volcano in Mexico, and mainly interpret how the processes observed in the lab affect the permeability of the two dome complexes at this volcano. My training in thermography and Matlab skills in image processing have also brought me the opportunity to develop routines to deal with thermal and numeric images, which I have implemented to recordings at Santiaguito volcano (Guatemala) and Volcán de Colima (Mexico). - Email Anthony

Suraya Hilmi Hazim_

Suraya Hilmi Hazim

'Linking Plutonism and Volcanism: Understanding the Development and Evolution of Large Magmatic Bodies'
Ministry of Education (Malaysia) and the National University of Malaysia
Supervisors: Janine Kavanagh, Alan Boyle, David Dennis and Catherine Annen (University of Bristol)
Description: This study aims to provide a deeper insight into the relationship between plutonism and volcanism using a combination of different approaches, both in the field and in the lab. I will be using analogue models to observe the formation of plutons, which will be complemented by thermo-mechanical numerical models and further informed by field observations. This multi-approach study will focus on the mechanisms which permit intrusions of molten rock to accumulate in the crust. This in turn will provide insight on how material accumulates beneath the Earth’s surface to form large reservoirs of molten rock with the potential to feed large magnitude volcanic eruptions. - Email Suraya

Simon Martin

Simon Martin

'The Dynamics of Magma Intrusion'
School of Environmental Sciences as a part time PhD student and part time Graduate Teaching Assistant
Supervisors: Janine Kavanagh and Andrew Biggin
Description: Intrusions are a key mechanism for the transport of magma through the crust, providing a pathway for the emplacement and development of volcanic complexes. Currently, the mechanisms associated with emplacement and propagation of magma intrusions are poorly constrained. This project utilizes petrology, rock magnetism and analogue modelling techniques to investigate the dynamics of magma flow within intrusions and how these are preserved in outcrop. Field work was conducted on sills of the British Palaeogene Igneous Province, Scotland, to investigate preserved structures. Sampling was conducted to investigate crystalline and magnetic flow fabrics along the length and breadth of intrusions. These results will be compared with analogue models to better constrain the dynamics of magma intrusions. The results have wider implications for hazard and risk assessment of volcanic systems, as the factors that influence intrusion emplacement and propagation can help to understand the triggering and dynamics of eruptions at the surface. - Email Simon

Paul A Wallace

Paul Wallace

'Thermal destabilisation of magma in the volcanic system'
European Research Council Project: Strain Localisation in Magma (SLiM)
Supervisors: Yan Lavallée, Jackie Kendrick and Felix von Aulock
Description: Lava dome eruptions are some of the most unpredictable types of volcanic activity as they can shift from effusive to explosive styles with little precursory warning. My current research involves experimentally testing the rheological response of magma in pressure and temperature-disequilibrium. Effusive and explosive products will be analysed structurally, chemically and petrographically. Natural processes will be replicated experimentally using high-temperature decompression tests to examine volatile exsolution and crystallization, and rotary shear experiments to examine super-heated foaming and mineral decomposition. The data gathered will provide insights into rheological changes that occur during magma ascent and help constrain extrusion rate in different systems. Dome lavas with different initial geochemical compositions will be tested to assess the decompression/viscosity path that drives different styles of volcanic eruptions. Further research interests include studying the mechanisms of explosive eruptions, specifically Vulcanian, to understand the dynamic processes controlling the initiation and changes of these complex systems. - Email Paul