Urban Noise Tomography in Athens, Greece, using Distributed Acoustic Sensing (DAS)
| Autor: | Bowden, Daniel, Tian, Lu, Wang, Yuhan, Smolinski, Krystyna, Fichtner, Andreas, Bogris, Adonis, Nikas, Thomas, Lentas, Konstantinos, Melis, Nikolaos S., Simos, Christos, Simos, Iraklis |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| Popis: | We use 24 km of telecommunications fiber in Athens, Greece, to explore the use of ambient noise correlations and the construction of a shallow 2D velocity model. Models of the shallow subsurface are especially important for hazard and site-response characterisation, yet traditional measurement campaigns in dense, urban environments can be challenging. Using pre-existing telecommunications fiber provides an efficient and easy way to construct such high-resolution models.The fiber was provided by the Hellenic Telecommunications Organization (OTE), over 36 days in the Autumn of 2021, and in cooperation with the National Observatory of Athens (NOA). Using a Silixa iDAS interrogator, we measure strain-rates every 4 meters along the fiber to provide dense observations of wave propagation. Strong anthropogenic noise gives clear Rayleigh-wave signals in cross-correlations in the frequency band of 5-30 Hz. We discuss our efforts to efficiently stack multiple virtual sources’ record sections and construct dispersion curves. We then invert for numerous 1D velocity profiles of the top ~100 m, comparing different approaches, and finally present a 2D model over the entire line. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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