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Abstract text
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Satellite interferometry is now a consolidated tool to monitor and detect ground movements related to geological phenomena or anthropic activity. The setup of regional and national Ground Motion Services has increased with the launch of free and open access Sentinel-1 satellites that provide regular acquisition worldwide. In a few months, the European Ground Motion service will provide a deformation map over Europe that will be annually updated. This huge amount of data, freely available to anyone, can be a valuable added information for land management, risk assessment, and a wide range of users. In order to squeeze the potentiality of these data, tools and methodologies to generate secondary products for a more operational use are needed. Here we propose a method to map, from a PSI deformation map at global scale, the degree of spatial gradients of displacement to distinguish areas where damages to structures and infrastructures are more probable to occur. The method is based on the concept that a structure exposed to differential settlements is more prone to suffer damages or destruction. Starting from the detection of the most significant Active Deformation Areas (ADA), with the existing ADATools, we generate three different outputs, which are strictly related: a) the spatial gradient map, to have an information about where more or less damages are expected; b) the time series of local gradients, to see the history in time of the gradients, important to know the temporal evolution in the past and to keep the monitoring; and c) the potential damage map, which is a map with the existing structures classified on the basis of the potential damage. We present the results over the coastal area of Granada County, strongly affected by slope instabilities. A field survey has been carried out to map the actual damages in some residential areas where movement has been detected. The damages mapped in the field will be showed and compared with the outputs of the methodology. This work has been developed in the framework of Riskcoast, an ongoing project financed by the Interreg Sudoe Program through the European Regional Development Fund (ERDF).
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