European Center for Geodynamics and Seismology (ECGS) | Centre Européen de Géodynamique et de Séismologie (CEGS)

Halldor Geirsson

Photo of Halldor Geirsson

Research interests

The focus of my research is contributing to improved understanding of various volcanic and tectonic Earth processes and properties such as magma accumulation, eruptions and intrusions, earthquakes, and plate boundary deformation. I mostly rely on geodetic methods (GNSS, InSAR, tilt, borehole strain), however, I also use other data sources such as seismic, gas, geochemistry, petrology, visual observations, etc., where applicable. Most of my previous work is on volcanic and tectonic processes in Iceland and Central America (see publication list).

For my current (since January 2015) post-doctoral position at ECGS I am studying deformation sources in the Virunga Volcanic Region in Central Africa. In this area (the western branch of the East Africa Rift Zone) the Nubia and Victoria plates are diverging by 2-3 mm per year, and the very active volcanoes Nyiragongo and Nyamulagira are positioned inside the rift valley. My objectives are to use data from the Kivu continuous GNSS network and InSAR time series from the MSBAS algorithm to: investigate long-term inter-eruptive volcanic deformation in the region; model short-term precursory and co-eruptive deformation to understand their sources and interplay; geodetically identify the axis of the Nubia-Victoria plate boundary. A substantial part of my work is also dedicated to developing near-real-time analysis of geodetic data and training of local scientists for improved hazard monitoring of the Kivu area. My work is funded by the Luxembourg Research Fund (AFR) and the Belgium Research Fund (BELSPO – through the GeoRisCA project).


Career experience