Investigation of Deep Bedrock Geometries Using Insar Time Series and Geophysical Investigations
Abstract
The European (ESA) and Italian (ASI) space agencies are managing and distributing a huge amount of SAR data recorded from the satellites. Moreover, in the last years the availability of these large SAR data archives coupled to the new methodologies based on advanced cloud computing implementing the differential SAR interferometry, permits the massive processing of satellite data to generate, in automatic and efficient way, deformation time series. We analyse ground subsidence occurring in Central Italy by means of the analysis of Permanent Scatterers - Interferometric SAR data archives derived from ESA satellites ERS1/2, Envisat, Sentinel-1 and the ASI COSMO-SkyMed datasets in both ascending and descending orbits, in order to measure vertical ground displacements in Valle Umbra valley (Central Italy), and to observe the ground velocities and geometries between 1992 and 2016. The measure of the land subsidence was calculated using time-gapped SAR data. Time gaps between satellite measures were filled by assuming linearity of the deformation trends and validating results through differential GPS campaigns. The subsidence reveals the impact of water pumping on the landscape transformation and hydrological equilibria with irreversible compaction of aquifers. Moreover, the valley subsidence shape helps us to individuate the projection toward the surface of the geologic heterogeneities and buried faults at deep. Starting from the surface deformations measures in order to detect and characterize the heterogeneities in the subsurface, we planned and realize two geophysical campaign of ambient noise spectral ratio measures and 2D passive arrays for the site characterization of a local accelerometric station of the national civil protection.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.G11B0520B
- Keywords:
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- 1209 Tectonic deformation;
- GEODESY AND GRAVITY;
- 1211 Non-tectonic deformation;
- GEODESY AND GRAVITY;
- 1240 Satellite geodesy: results;
- GEODESY AND GRAVITY;
- 1241 Satellite geodesy: technical issues;
- GEODESY AND GRAVITY