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Published in:
2023 | OriginalPaper | Chapter
Monitoring System Implemented to Evaluate the Kinematics of an Instability Zone at Flores Island
Authors : F. Marques, L. Moniz, P. Amaral, A. Malheiro, A. Santos
Published in: Advances in Natural Hazards and Volcanic Risks: Shaping a Sustainable Future
Publisher: Springer Nature Switzerland
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Abstract
Taking into account its geology, morphology and hydrology, the island of Flores (Azores archipelago) is susceptible to the occurrence of slow slope movements. These situations of instability have been more studied in the last 20 years. Following the studies, it has been found that these instability phenomena are increased when the weather conditions are more adverse, particularly regarding the duration and intensity of rainfall. The study presented in this document concerns two localities on Flores Island: Lajedo and Fajãzinha. The monitoring systems (vibrating wire and Casagrande piezometers, inclinometers, rain gauge station and total robotic station) were installed in two mass movements, and their results are presented. This work aims to determine alert and alarm thresholds based on the amount of precipitation and the water level variation in possible fault surfaces.