CV – Hannah Calleja

My Academic CV

Education

PhD Student – University of Edinburgh

Supervisory Team: Prof L. Kirstein, Dr E. Breard, Dr I. Butler, Prof G. Fitton. External Advisor: Dr Tom Pering

2021 – 2025

Thesis Title: Exploring subsurface fluid dynamics of bubble-driven eruptions and unique textures yielded by volatile saturated systems.

I am a third year fully funded student with the E4 Doctoral Training Partnership. My research explores eruption mechanisms in shallow volcanic plumbing systems. I quantify multi-phase flow within complex conduits to understand bubble-driven eruption mechanisms. I also examine volatile interaction with surrounding melt and supercritical fluids via hydrothermal experiments.

MGeogSci – University of Sheffield

Supervisor: Dr Tom Pering

2017 – 2021

I developed a taste for experimental volcanology during my integrated masters degree in Physical Geography. I won the LR Moore Prize for distinction in presentation of my thesis ‘Quantifying the behaviour of Taylor bubbles rising through solid-rich suspensions in vertical and inclined conduits: analogue experiments for slug-driven volcanism in basaltic style magmas.’

Skills

Communication

I attended the following conferences during my postgraduate career:

Edinburgh University GradSchool Conference 2024 | attendee
VMSG 2024 | oral presentation
IUGG 2023 | oral presentation
GeoSciences PGR Conference 2023 | poster presentation
IAVCEI 2023 | poster presentation
VMSG 2023 | oral presentation
GeoSciences PGR Conference 2022 | oral presentation
vVMSG 2022 | poster presentation
vVMSG 2021 | flash talk
VMSG 2020 | attendee

Experiments

Fluid Flow Experiments | Bubble ascent recorded at high resolution, both in isolation and in continuous flow | Low-cost, versatile, adaptable | Built to accommodate complex flow conditions e.g. inclination, particles, storage zones.
Miniature Cold Seal | Hydrothermal Experiments at sub- and super-critical PT conditions | Insulated steel block with centrally located pressure vessel to house 2 mm diameter capsules.
Rapid Quench Cold Seal | Hydrothermal Experiments at sub- and super-critical PT conditions | Drop quench.

IT & Tech

MATLAB & Octave

PIVlab | Using bubbles as tracers to track fluid behaviour surrounding Taylor bubbles and spherical caps as they ascend in laminar and turbulent regimes.
Scripts for small tasks | E.g. extracting frames from videos, simple statistical analysis.
1D Diffusion modelling | Script built in workshop run by K. Lynn (HVO) | Mar 2024.

Python

PyCamPermanent | UV-SO2 camera software for data acquisition, processing and analysis. Runs with Miniconda using the Pyplis toolbox.

ImageJ | Image processing, particle tracking in experiment footage.

Inkscape | Figure illustration.

Arduino | Build Your Own Environmental Sensor Workshop | Kings College London | May 2024

Teaching & Mentoring

I held the following teaching roles during my postgraduate career:

Lead Demonstrator | Natural Hazards | assisted lecturers during labs and co-ordinated demonstrating and marking schedules | 2023
Tutor | Research Design for Physical Geography | Independently ran sessions for small groups of 4^th year UG students | 2022
Demonstrator & Practical Assistant | Earth Dynamics | Assisted lecturers with lab setup and student Q&A | 2021
Student Representative, University of Sheffield | 2019 – 2021

I have also volunteered my time as a mentor to highschool & early UG students:

PhD Mentor | LEAPS Mentoring Scheme | 2023
PhD Mentor | REP summer internship scheme | 2022

Volunteering & Outreach

Igneous Reading Group Organiser | Edinburgh University | 2023
Interview support | E4 DTP | 2022/3
Applicant support & media outreach | E4 DTP | 2022/3
COVID-19 safety officer | Netball of Excellence | 2020 – 2021
Student Fundraiser | Dig Deep | 2018
Research Assistant & Student Fundraiser | OPWALL | 2017

Fieldwork

Kīlauea | USGS Hawai’ian Volcano Observatory | Internship with the Gas Team

PiCam UV-SO2 Cameras | Realtime troubleshooting with campaign and permanent field cameras | Logging error reports | Manual data transfer | Writing accessible ‘quick start’ manuals for field use | Shadowing routine maintenance & network tests.
DOAS | mobile (vehicle) DOAS traversing for weekly plume SO2 amounts.
Multi-Gas | Portable campaign in SW rift zone | Shadowing routine maintenance & network tests.
FlySpec Array | Shadowing routine maintenance & network tests.

Research

Fluid Dynamics

Eruption forecasting relies how well we understand the multiphase behaviour of magmas in shallow plumbing systems. I quantify multi-phase flow within vertical & inclined conduits using flow experiments, image tracking, and particle image velocimetry to investigate mechanisms for bubble-driven eruptions e.g. Strombolian explosions.

Gas Monitoring

While my PhD focuses on subsurface conditions and what type of eruption these might generate, my personal interest lies with how the volcanic gases driving these processes can be monitored at the surface. I recently interned at the Hawaiian Volcano Observatory, where I was involved in monitoring Kilauea’s volcanic plume processes using portable UV-SO2 cameras (PiCam) which are designed for the Raspberry Pi micro-computing system.

Hydrothermal Experiments

I also examine how volatile interaction with surrounding melt and supercritical fluids yields unique textures (specifically micron-scale glass spheres) within the erupted products of volatile-driven eruptions with a series of fast and slow quench petrology experiments.