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Master Thesis

Le champ de déformation 3D des Alpes occidentales par 20 ans de données GNSS : exploitation des mesures temporaires et permanentes locales jusqu’à analyse massive à l’échelle européenne

Abstract : The horizontal deformations experienced throughout the occidental Alps are weak in amplitude and do not explain the measured uplift of the mountains. The analysis and quantification of the deformations can be completed using a velocity field. However, the reliability of these velocity field models are dependant on the observation time and the selected computation method. By comparing different solutions of permanent RENAGE GNSS networks, it is possible to identify and isolate the underlying signals of speeds on the order of 0.2 mm/year. Velocity convergences modeled from 22 years of “Alpes” measurement campaign data shows encouraging and realistic results for the permanent stations located in the region. An analysis of the measured deformations by a single tensor shows a global extension in an E-W/NE-SE orientation. The quantification of these deformations, estimated from the above mentioned velocity profiles, identifies an extension deformation along the centre of the mountain range and compression on the bordering sides. These values are 10 times weaker than the previously reported estimations.
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Master Thesis
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Lucas Pinget. Le champ de déformation 3D des Alpes occidentales par 20 ans de données GNSS : exploitation des mesures temporaires et permanentes locales jusqu’à analyse massive à l’échelle européenne. Sciences de l'ingénieur [physics]. 2016. ⟨dumas-01805006⟩

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