Carlos BECERRIL - Towards Tsunami Early-Warning with Distributed Acoustic Sensing (DAS)

Towards Tsunami Early-Warning with Distributed Acoustic Sensing (DAS) - Seminar by Carlos BECERRIL (Université d'Alcala, OCA, Geoazur)
Although Tsunami Early Warning Systems (TEWS) are in operation, they are yet to become the norm, mainly due to the high cost of installation and operation of offshore instrumentation with sufficient spatial coverage and spatial density of instruments. Emerging instrumentation such as Distributed Acoustic Sensing (DAS) may offer a cost-effective solution whilst fulfilling some of the key requirements for early-warning systems, such as low data latency and high spatial density by converting the already existing seafloor telecom fiber links into a dense linear array of strain sensors over spans of up to 100 km. Despite these attributes, there are some aspects of DAS that need to be addressed towards integrating these sensors into future early-warning systems: 1) DAS measures 1D horizontal strain when vertical pressure is the usual means to detect tsunami, and 2) DAS usually has lower performance at long periods typical of a tsunami (a few 100s). In this work, we investigate both aspects
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This is a "Mardi Séismes" seminar of the Geoazur Earthquakes-Hazard-and-Risk (geoazur.oca.eu...) and Earthquakes-Cycles (geoazur.oca.eu...) teams recorded on 13-02-2024.