Present-day uplift of the western Alps

Présentation de Christian Sue (Chrono Environnement) au 1er Workshop Résif "Aléa sismique" | 27 et 28 septembre 2016, Strasbourg

Transcript

1. 1er Workshop RESIF-aléa – Strasbourg 27-28 sept. 2016
2. Tectonic context Horizontal velocities < 0.2 mm/yr , ext. across the belt Vertical velocities up to 2.5 mm/yr (NW alpine arc) Levelling GNNS Data and facts
3. Levelling GNNS combined Levelling rates
4. Serpelloni et al, 2013 Coherency with larger scale GPS analysis … And with quaternary exhumation rates  Alpine scale and (quite) long term process Fox et al., 2015
5. External processes GIA (all contrib.) erosion unloading combined
6. Seismotectonics : deformation mode vs. topography (& … crustal thickness) Correlation (qualitative) : topo/extension/uplift Delacou et al., 2004
7. Champagnac et al., 2007 Erosion-induced extension Vernant et al., 2013 Modelling: unloading (GIA + erosion)  “extensional uplift”
8. Residual uplift rates (from ext. Processes) ….
9. - GPA - Delamination of continental lithosphere  Mass release + dynamic topography ? erosional unloading delaminational unloading (courtesy Pr. E. Kissling, ETHZ) Deep structures, uplift, and alpine dynamics Sue et al., 1999
10. Uplift and tomography… the old version (Lippitsch et al., 2003)
11. Uplift and tomography… the new version (Zhao, Paul et al. in press)
12. Sue et al., JGR, 1999 Max 0.2-0.4 mm/a Seismic strain rate Sue et al. 2007 Uplift and seismic activity  Uncorrelation ! (quantitative)
13. Uplift and seismic activity : Uncorrelation B. Potin’s PhD (2016)
14. B. Potin’s PhD (2016) Uplift and seismic activity : Uncorrelation