DAS Istanbul: From detecting the 2023 East Anatolian earthquakes to full-waveform inversion with dark fibers
| Autor: | Shaikhsulaiman, A., Bodwen, D., Fichtner, A., Bozdag, E., Konca, A., Ergintav, S., Ertan, E., Yavuz, E., Bostancioglu, I., Ünlü, M. |
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| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-2693 |
| Popis: | Distributed acoustic sensing (DAS) has an exceptional potential of high temporal and spatial resolution capable of revolutionizing geophysical ground motion measurements. Furthermore, existing telecommunication fiber-optic cables, “dark fibers”, offer cheap seismic measurement system particularly in a challenging and busy urban city, such as Istanbul. In this piece, we present results of data recorded by the first 8km segment of a 30km long dark fiber, along the Anatolian side of Istanbul. This includes recordings of the recent East Anatolian earthquake in Turkey, 6th of February 2023 with magnitude Mw 7.8, and its aftershocks.Using the same recorded data, we additionally aim to present initial results of applying a novel workflow that combines advantages of DAS recordings with recently developed waveform imaging techniques. Our goal is to build a comprehensive initial 2D shallow shear velocity model using a trans-dimensional Bayesian inversion of dispersion curves obtained from ambient noise interferometry. Constrained by available geological and engineering knowledge, the initial 2D shear velocity model will serve as an input for preforming an ambient noise full waveform inversion (FWI), to produce a high-resolution accurate model. The result is expected to greatly increase the understanding of the city's shallow subsurface (first hundred meters) and the assessment of its seismic hazard maps. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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