Day 4

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Paper title Identification of geological risks in the province of Jaén (Spain) through Sentinel-1 and MT-InSAR techniques
Authors
  1. Antonio Miguel Ruiz-Armenteros University of Jaén Speaker
  2. Mario Sánchez-Gómez University of Jaén
  3. José Manuel Delgado Blasco RHEA Group
  4. Matus Bakon insar.sk / University of Presov
  5. Ana Ruiz-Constán Instituto Geológico y Minero de España
  6. Jesús Galindo-Zaldívar University of Granada
  7. Milan Lazecky University of Leeds
  8. Miguel Marchamalo-Sacristán Universidad Politécnica de Madrid
  9. Daniele Perissin Raser Limited Ltd. / Università degli Studi di Padova
  10. Joaquim João Sousa Universidade de Trás-os-Montes e Alto Douro
Form of presentation Poster
Topics
  • D1. Managing Risks
    • D1.01 Satellite EO for Geohazard Risks
Abstract text Geological risk studies are of great importance in the planning and management of the territory, but they are also essential to guarantee the safety of works and buildings located in inappropriate places. The field of study encompassed by geological hazards is varied and complex; highlights the modeling of landslides, the analysis of rock blocks falls, the identification of problems derived from progressive movements of the ground (creeping) and flood studies, among others. The socioeconomic impact derived from geological risks in Spain in recent years has produced alarming figures. Over the last few years, losses have totaled at least more than 5,000 million euros. Recent events in Spain are the Lorca earthquake (2011), the underwater volcanic eruption on El Hierro island (2011) or the recent one on La Palma island (2021), with considerable economic losses. Two very important projects in Spain, such as the Pajares railway tunnels (2009) and the Castor gas storage (2013), were ruined by unforeseen geological problems, such as the erroneous interpretation of hydrogeological conditions or not considering the induced seismicity. This produced millionaire extra cost in addition to possible environmental consequences. But the most worrying thing, without a doubt, is that most of them could have been avoided if the geological factors had been taken into account, which have been, in all the mentioned cases, the origin of the problems.

These recent experiences show that Geology has an important weight in the development of infrastructures, in the economy and in the environment, and that geological knowledge is essential to avoid the repetition of situations such as those that have occurred in recent years in Spain. It is essential to improve geological research by providing adequate means both in the case of infrastructure projects and in geological research. But, in addition, Geology contributes in a very positive way to the economic optimization of infrastructures and to the reduction of costs. In some cases, the geological-geotechnical reports guarantee the safety of the infrastructures that advocate a high risk of collapse, allowing their exploitation without any incident.

The contribution of geosciences to the economy, development and security of infrastructures, and to the prevention and mitigation of natural and environmental risks, is unquestionable and must be taken into account by public administrations. Within geosciences, satellite radar interferometry is a technique for observing the Earth from space that allows us to monitor our planet remotely using radar images acquired by radar sensors aboard artificial satellites orbiting the Earth. Using radar images from artificial satellites and using multi-temporal radar interferometry techniques, we can study the behavior of the terrain and detect possible deformations and structural damage that are occurring in any part of the planet where these satellite images are available and covered. The Copernicus program, thanks to the use of Sentinel-1, has exponentially increased the possibility of conducting these multi-temporal studies. In addition, the technique allows us to look back and study not only what is happening today but also how the terrain has been deformed since the beginning of the 90s thanks to the large data bank of radar images available from ERS-1/2 (1990-2000) and Envisat (2002-2010) satellites.

Until now, this technique, satellite radar interferometry, has had little application in geological risk studies in the province of Jaén (southern Spain), which will allow us to identify ground deformations in undetected or unknown potential geological risk areas. This study presents the work carried out in the province of Jaén using C-band radar images from Sentinel-1 and multi-temporal techniques of satellite radar interferometry to identify geological risk areas that help mitigate the damage that this supposes on the environment and society in general.