The Contribution of Submarine Optical Fiber Telecom Cables to the Monitoring of Earthquakes and Tsunamis in the NE Atlantic

Recent developments in optical fiber cable technology allows the use of existing and future submarine telecommunication cables to provide seismic sea-level information. In this work we study impact three different technologies, 1) SMART, Science Monitoring Reliable Telecommunications; 2) DAS, Distributed Acoustic Sensing, and; 3) LI, Laser Interferometry, for effective earthquake tsunami monitoring capabilities on NE Atlantic. The SW Iberia is source area largest destructive that struck Europe since year 1000, November 1, 1755 event. This generated also a affecting whole basin. tectonically active crossed by CAM (Continent-Azores-Madeira) ring configuration. Due end lifetime current need be replaced 2024 technical requirements must defined mid-2021. Azores archipelago focus frequent crizes occasionally earthquakes. A common feature these events they take place offshore, an difficult monitor from land-based instruments. evaluate contribution SMART early warning system show how DAS LI can improve two domains Azores. For warning, offshore measurements clean records when compared coastal observations tide gauges, which greatly improves efficiency system. monitoring, data processing operational routine examined using Monte-Carlo simulations. These into consideration errors phase picking uncertainty 1D velocity model used location. Quality location difference between true centroid computed epicenters overall ellipse obtained 100 runs. added value provided instrumented mitigate risk demonstrated will help authorities society general political decisions required its full implementation worldwide.