Geodetic constraints on glacial isostatic adjustement in Europe

• Published in: Geophysical Research Letters
• Main Authors: Nocquet, J.-M., Calais, E., Parsons, B.
• Other Authors: Géoazur (GEOAZUR 6526), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2005
• Subjects: [SDU]Sciences of the Universe [physics]; Fennoscandia
• Online Access: https://hal.science/hal-00407456; https://hal.science/hal-00407456/document; https://hal.science/hal-00407456/file/2004GL022174.pdf; https://doi.org/10.1029/2004GL022174

Geophysical Research Letters, v. 32, p. L06308, 2005. http://dx.doi.org/10.1029/2004GL022174 International audience Direct measurements of surface deformation due to Glacial Isostatic Adjustment (GIA) in Europe have been so far mostly limited to the present-day uplift area. Here, we use permanent GPS networks results to investigate the significance of GIA effects in Europe south of Fennoscandia. We show that uplift in Fennoscandia is surrounded by subsidence reaching as far south as the Alps, with a maximum vertical rate of 1.5 mm/yr between 50.5-53°N. Horizontal velocity gradients show shortening between Fennoscandia and north-central Europe with strain rates of $10 À9 yr À1 and principal compressional strain axis pointing to the Gulf of Bothnia in a radial pattern. We find a very good quantitative agreement with the 3D surface displacement predicted by Milne et al. (2001), although the increase of misfit in far-field of Fennoscandia suggests that geodetic data outside of the uplift area may bring additional constraints to the rheological parameters used in GIA models.