2021–2023 Unrest and Geodetic Observations at Askja Volcano, Iceland

• Published in: Geophysical Research Letters
• Main Authors: Parks, Michelle Maree, Sigmundsson, Freysteinn, Drouin, Vincent, Hreinsdóttir, Sigrún, Hooper, Andrew, Yang, Yilin, Ófeigsson, Benedikt G., Sturkell, Erik, Hjartardottir, Asta Rut, Grapenthin, Ronni, Geirsson, Halldor, Trasatti, Elisa, Barsotti, Sara, Pedersen, Rikke, Einarsson, Páll, Óladóttir, Bergrún, Friðriksdóttir, Hildur M
• Other Authors: #PLACEHOLDER_PARENT_METADATA_VALUE#, Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italia
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley-Agu 2024
• Subjects: Askja; Iceland
• Online Access: http://hdl.handle.net/2122/17112; https://doi.org/10.1029/2023GL106730

Unrest began in July 2021 at Askja volcano in the Northern Volcanic Zone (NVZ) of Iceland. Its most recent eruption, in 1961, was predominantly effusive and produced ∼0.1 km3 lava field. The last plinian eruption at Askja occurred in 1875. Geodetic measurements between 1983 and 2021 detail subsidence of Askja, decaying in an exponential manner. At the end of July 2021, inflation was detected at Askja volcano, from GNSS observations and Sentinel‐1 interferograms. The inflationary episode can be divided into two periods from the onset of inflation until September 2023. An initial period until 20 September 2021 when geodetic models suggest transfer of magma (or magmatic fluids) from within the shallowest part of the magmatic system (comprising an inflating and deflating source), potentially involving silicic magma. A following period when one source of pressure increase at shallow depth can explain the observations. Published e2023GL106730 OSV2: Complessità dei processi vulcanici: approcci multidisciplinari e multiparametrici JCR Journal