COMET+ Webinar
17 May 2023, 4pm BST, 3pm UTC, 5pm CEST, 8am PDT
Dr Simon Daout (CRPG/ENSG)
Along-strike variation of the strain partitioning within the Apennines as seen from large-scale multi-temporal InSAR analysis
Please register at: Webinar Registration – Zoom
Abstract
Within the Apennine mountain in the Italian Peninsula, GPS data display 3-4 mm/yr of divergent motion oriented N50˚E between Adria and Tyrrhenian coastlines. However, the driving mechanisms for this extension are still debated and along-strike variations of extension of the actively deforming belt are still poorly constrained. Based on the analysis of 7 years of Sentinel-1 data, this study provides the first large-scale extensional and vertical velocity field derived by a multi-temporal InSAR analysis at the scale of the Apennines, improving the spatial resolution and the vertical accuracy of existing GPS measurements. The results reveal an along-strike variation of the extensional rates and gradients, with a concentration of the extension on single fault systems in northern Apennines, consistent with the locus of the seismicity and recent moderate earthquakes, and a distribution of the extension within central Apennines, where the range is also widening. Vertical surface displacements do not resolve any active long-wavelength uplift of the orogenic belt and show on average more subsidence of the range relative to the Tyrrhenian and Adriatic coasts, than uplift. This work provides the first InSAR-based geodetic map of differential extension and uplift within the Italian Peninsula, compatible with a pure shearing extensional model of the crust, driven by both boundary and gravitational forces.
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