Compositional and textural tephra characteristics of the 1970 eruption at Deception Island (Antarctica): Implications for volcanic hazards ...

• Main Authors: Hopfenblatt, Joaquín, Geyer, Adelina, Aulinas, Meritxell, Polo Sánchez, Antonio, Pedrazzi, Dario, Álvarez-Valero, Antonio M., Vilanova, Oriol, Pallàs, Raimon, Casas, Josep M.
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: King George Island; South Shetland Islands; Deception Island; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.57757/iugg23-1058; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018204

<!--!introduction!--> Deception Island is the most active volcano in the South Shetland Islands with more than 20 explosive eruptions registered over the past centuries. The latest event (1970) was severely violent with a volcanic explosivity index (VEI) of 3. The column height reached 10 km, the estimated bulk eruptive volume was > 0.1 km3 and tephra fallout was reported as far as in King George Island (> 150 km distance). In this work, we perform a compositional and textural analysis of the 1970 tephra layers found at Livingston Island’s glaciers. Results obtained are compared to the in situ pyroclastic deposits of the active vents during the eruption. The objective is to establish a correlation between the eruptive phases occurred during the 1970 event and the physicochemical features observed in the tephra deposits. This will be used the onset of future studies of tephra layers found in glaciers and marine/lacustrine sediment cores outside the island, improving our capacity to reconstruct the ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...