Acknowledgements
The data from airborne surveys will be available on https://zenodo.org/ and data from Pléiades will be available on https://www.theia-land.fr/en/product/pleiades/. The processed data is currently available in the Supporting Information for the purposes of review.
We would like to thank our pilots Ú. Henningsson, K. Kárason, K. Halldórsdóttir, G. Árnason, J.Sverrisson, the Icelandic Coast Guard and Iceland Aviation Service for their commitment to carry out flights. The authors would like to acknowledge the Icelandic Research fund, Grant No. 206755-052, the Fulbright–NSF Arctic Scholar program, NSF RAPID program and the French Space Agency (CNES) for their support. Pléiades images were provided under the CIEST² (CNES) initiative during the first 10 days of the eruption and through the Icelandic Volcanoes Supersite project supported by the Committee on Earth Observing Satellites (image Pléiades©CNES2021, distribution AIRBUS DS).