4D geometrical and structural analysis of ground ruptures related to 2016 earthquakes in Sibillini mountains (Central Italy)

3D multi-temporal reconstructions (4D) of the geometries and the kinematics of a portion of the 35 km coseismic surface ruptures related to 2016 Central Italy earthquakes are presented. The analysis integrates a traditional structural field survey with the data extracted from 3D point cloud models. These models were generated using a Structure-from-Motion (SfM) algorithms applied to georeferenced low-altitude aerial digital photos, both zenithal and oblique, acquired with small Unmanned Aerial Vehicles (UAV). Several comparisons were performed between data measured in the field and the same data detected on the point cloud models. The results show errors of a few cms, where models generally overestimate the real data. The coseismic ground ruptures typically show multiple overlapping scarps that can be divided into kinematic sets that occur throughout the width of the pre-existing SW dipping normal fault zones

Detection and Monitoring of Tunneling Induced Ground Movements Using Sentinel-1 SAR Interferometry

SAR interferometry is a powerful tool to obtain millimeter accuracy measurements of surface displacements. The Sentinel-1 satellite mission nowadays provides extensive spatial coverage, regular acquisitions and open availability. In this paper, we present an MT-InSAR analysis showing the spatial and temporal evolution of ground displacements arising from the construction of a 3.71 km overflow tunnel in Genoa, Italy. Underground tunneling can often modify the hydrological regime around an excavated area and might induce generalized surface subsidence phenomena due to pore pressure variations, especially under buildings. The tunnel was excavated beneath a densely urbanized area lying on upper Cretaceous marly limestone and Pliocene clays. Significant cumulative displacements up to 30 mm in the Line of Sight (LOS) direction were detected during the tunnel excavation. No displacements were recorded before until the middle of 2016. The Persistent Scatterers Interferometry (PSI) analysis reveals in high detail the areal subsidence, especially where the subsurface is characterized by clay and alluvial deposits as well as there is the presence of large building complexes. The time-series and the displacement rate cross-sections highlight a clear relation with the tunnel face advancement, responsible for the subsidence phenomena, which proceeded northward starting from the middle of 2016 to the end of 2017. The stabilization occurred in a range of five-six months from the beginning of each displacement phase. Due to the low subsidence ratio the ground settlements did not cause severe damages to the buildings

Tn (Tidal notches) in the western Adriatic coast as markers of local coastal stability during late Holocene.

none12noneStefano Furlani, Daniela Piacentini, Francesco Troiani, Sara Biolchi, Matteo Roccheggiani, Andrea Tamburini, Emanuela Tirincanti, Valeria Vaccher, Fabrizio Antonioli, Stefano Devoto, Olivia Nesci, Marco MenichettiFurlani, Stefano; Piacentini, Daniela; Troiani, Francesco; Biolchi, Sara; Roccheggiani, Matteo; Tamburini, Andrea; Tirincanti, Emanuela; Vaccher, Valeria; Antonioli, Fabrizio; Devoto, Stefano; Nesci, Olivia; Menichetti, Marc