Study of the structural and dynamic changes of a surging glacier using seismic observations ...

• Main Authors: Nanni, Ugo, Thomas, Pauze, Lucien, Goulet, Andreas, Kohler, Coline, Bouchayer, Thomas, Schuler
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Kongsvegen; Svalbard; glacier
• Online Access: https://dx.doi.org/10.57757/iugg23-1567; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018039

<!--!introduction!--> Glacier flow instabilities are mainly caused by changes at the ice-bed interface, where basal slip and sediment deformation drive basal glacier movement. Understanding basal processes and their response to external forcing remains difficult due to limited access to the glacier bed. In this study, we examine variations in subsurface and subglacial mechanical conditions of Kongsvegen glacier (Svalbard). This glacier shows strong indications of an imminent new rapid flow event. To investigate the potential causes of such an acceleration, we combine conventional measurements such as surface velocity (20 GNSS along the flow line) and basal water pressure (two boreholes) with seismic measurements (14 seismometers along the flow line and 6 seismometers in boreholes) and a unique measurement of basal drag applied to the sediments. We use our seismic measurements to study (1) subglacial hydrological conditions and (2) changes in ice structure using seismic interferometry. At seasonal time ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...