Present-Day Architecture of the Magma Plumbing System beneath Hekla Volcano from Magnetotelluric Imaging

Hekla volcano, one of Iceland’s most active stratovolcanoes, is characterised by very short eruption precursory times and a complex tectonic setting at the intersection of the South Iceland Seismic Zone (SISZ) and the Eastern Volcanic Zone. Despite its frequent activity, the geometry and connectivity of the magmatic system beneath Hekla remain poorly constrained. In this study, we use three-dimensional magnetotelluric (MT) imaging to investigate the electrical resistivity structure beneath Hekla and its implications for magma storage and transport.This study forms part of a newly funded project under the Research Ireland Frontiers for the Future Programme, with objectives to (i) characterise the present-day structure, depth extent, and geometry of the magmatic system beneath Hekla, (ii) identify low-resistivity zones that may serve as proxies for partial melt and magma migration pathways, and (iii) assess potential magmatic interconnection between Hekla and the adjacent Torfajökull volcanic system, including the possibility of a shared deep magma source. Preliminary 3D inversion results based on MT data from 20 broad-band stations reveal two principal conductive features. Shallow (