Print Email Facebook Twitter Iceland rising: Solid Earth response to ice retreat inferred from satellite radar interferometry and visocelastic modeling Title Iceland rising: Solid Earth response to ice retreat inferred from satellite radar interferometry and visocelastic modeling Author Auriac, A. Spaans, K.H. Sigmundsson, F. Hooper, A. Schmidt, P. Lund, B. Faculty Civil Engineering and Geosciences Department Geoscience & Remote Sensing Date 2013-03-08 Abstract A broad uplift occurs in Iceland in response to the retreat of ice caps, which began circa 1890. Until now, this deformation signal has been measured primarily using GPS at points some distance away from the ice caps. Here, for the first time we use satellite radar interferometry (interferometric synthetic aperture radar) to constrain uplift of the ground all the way up to the edge of the largest ice cap, Vatnajökull. This allows for improved constraints on the Earth rheology, both the thickness of the uppermost Earth layer that responds only in an elastic manner and the viscosity below it. The interferometric synthetic aperture radar velocities indicate a maximum displacement rate of 24±4 and 31±4 mm/yr at the edge of Vatnajökull, during 1995–2002 and 2004–2009, respectively. The fastest rates occur at outlet glaciers of low elevation where ice retreat is high. We compare the observations with glacial isostatic adjustment models that include the deglaciation history of the Icelandic ice caps since 1890 and two Earth layers. Using a Bayesian approach, we derived probability density functions for the average Earth model parameters for three satellite tracks. Based on our assumptions, the three best fit models give elastic thicknesses in the range of 15–40 km, and viscosities ranging from 4–10×?1018 Pa s. Subject InSARfinite element modelingrheologyGIA To reference this document use: http://resolver.tudelft.nl/uuid:671fbd4b-cf41-4799-ac50-2d14492724e6 DOI https://doi.org/10.1002/jgrb.50082 Publisher American Geophysical Union Embargo date 2013-09-08 ISSN 0148-0227 Source Journal of Geophysical Research: Solid Earth, 118 (4), 2013 Part of collection Institutional Repository Document type journal article Rights © 2013 American Geophysical Union Files PDF Hooper_2013.pdf 4.3 MB Close viewer /islandora/object/uuid:671fbd4b-cf41-4799-ac50-2d14492724e6/datastream/OBJ/view