This homepage summarises the research orientation taken during my PhD (2014-2019)

PhD Research interests

• Physical processes occurring within shallow magma plumbing systems
• Microgravity and radar interferometry (InSAR)
• Volcano monitoring and eruption forecasting
• Rift zones and basaltic volcanoes

PhD project outline

1. Perform an uncertainty analysis for temporal gravity, aiming to estimate the ranges of uncertainty to be expected for each gravity reduction applied during data processing. By propagation of errors, the final expected range of uncertainty associated to any residual gravity changes can be estimated. All equations are provided to enable the estimation of uncertainties on a case-by-case basis. The analysis is based on volcanic applications but the methods and results can be applied to any other applications.

2. Study the gravity changes and surface deformation at Askja volcano (Northern Volcanic Zone of Iceland). Askja is a caldera complex, which lies within a segment of the mid-Atlantic ridge and has been subsiding since about 30 years. Inversion modelling techniques are used to constrain the current depths and magnitudes of mass and volume changes, from temporal gravity and deformation (InSAR, GPS) data, respectively. Comparing results enables the analysis of possible physical processes that could be responsible for the continuous subsidence.

Skills

Gravity: data processing (GTools), error analysis (my own package), inversion modeling

InSAR: data processing (Doris/StaMPS, Gamma), inversion modeling (GBIS)

Programming skills: Matlab, Python, bash, C-shell

Operating Systems: Linux, MacOS, Windows

Other programs: LaTex, GMT, Office, QGIS/ArcGIS

Abstracts for conferences

Giniaux, J.M., Hooper, A., Dumont, S., Bagnardi, M., Drouin, V., Sigmundsson, F., 2018. The Askja magma plumbing system (Iceland), an interesting puzzle, VMSG, Leeds, UK (Oral presentation).

Giniaux, J.M., Hooper, A., Bagnardi, M., Battaglia, M., 2017. New Methods for Assessing and Reducing Uncertainty in Microgravity Studies, AGU Fall Meeting, New-Orleans, USA (Oral presentation).

Hooper, A., Giniaux, J.M., Bagnardi, M., Dumont S., Sigmundsson F., Drouin V., 2017. Constraints on Pressure-Driven Flow Beneath Askja Volcano, Iceland, from Microgravity and InSAR Measurements, AGU Fall Meeting, New-Orleans, USA (Oral presentation).

Giniaux, J.M., Bagnardi, M., Hooper, A., Dumont S., Sigmundsson F., Drouin V., 2017. The enigmatic magma plumbing system of Askja volcano (Iceland), VMSG, Liverpool, UK (Oral presentation).

Giniaux, J.M.,  Bagnardi, M., Hooper, A. Wright, T.J., 2016. Study of the mass and volume changes occurring beneath Askja caldera (North Iceland) using InSAR and time-dependent microgravity data, 2002-2015, Living Planet Symposium, Prague, Czech Republic (Oral presentation).

Giniaux, J.M., Bagnardi, M., Hooper, A. Wright, T.J., 2016. Time-dependent microgravity to constrain mass changes at Askja volcano, Iceland, VMSG, Dublin, Ireland (Poster).

Giniaux, J.M., Hooper, A., Wright, T.J., Bagnardi, M., 2015. Coupling InSAR and Time-dependent Microgravity Measurements to Understand Subsurface Magmatic Processes, Fringe Workshop, Frascati, Italy (Poster).

Giniaux, J.M., Gudmundsson, M.T., Larsen, G., Agustsdottir, Th., Hognadottir, Th., 2013. Structure of phreatomagmatic crater rows from gravity surveying - Conduit shape comparisons between the fissures of the 871 AD Vatnaoldur and 1477 AD Veidivotn eruptions, South Central Iceland, IAVCEI Scientific Assembly, Kagoshima, Japan (Poster).

Theses

Giniaux, J.M., 2019 (PhD). Constraints on Askja Volcano, Iceland, from Surface Deformation and Gravity Change. School of Earth and Environment, University of Leeds, UK. pp. 176.

Giniaux, J.M., 2013 (MSc). Gravity studies of the structure of the Vatnaoldur and Veidivotn crater rows, south central Iceland. Faculty of Earth Sciences, University of Iceland, Iceland. pp. 82. (View pdf here)