GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 1.2 209 delaying the occurrence of large earthquakes. Among all the possible natural processes that cause the Earth’s surface to deform, there is an increasing interest in using geodetic observations to study hydrological processes at global to local spatial scales. Here we focus on the Eastern Southern Alps, a region where large part of the Adria-Eurasia convergence is accommodated (Serpelloni et al. , 2016), through large past earthquakes, and now precisely measured by a dense network of continuous GPS stations, managed by several private and public institutions. GPS horizontal velocities (Cheloni et al. , 2014; Serpelloni et al. , 2016) show that the highest horizontal deformation rates are localized along the South Alpine mountain front in Veneto and Friuli. Here GPS stations provide a (improvable) measure of the interseismic coupling, Fig 1 - Top: Horizontal displacements (red arrows) associated with the IC2 signal in the two time intervals T1 (mid- September to December 2010, top left figure, extensional phase) and T2 (January 2011 to April 2012, top right figure, compressional phase). White arrows represent horizontal principal strain axes, obtained from the displacement time series associated with IC2 of stations included in the black dashed polygon. The dark and light gray areas represent “highly productive fissured karst aquifers” and “low and moderately productive fissured karst aquifers” from the International Hydrogeological Map of Europe 1:1,500,000 (http://www.bgr.bund.de/ihme1500) . Bottom: Time series of the dilatational strain. Two time intervals (T1, T3) representing extensional deformation are highlighted in dark gray, while in light gray two time intervals (T2, T4) associated to contractions.