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DAS Istanbul: From detecting the 2023 East Anatolian earthquakes to full-waveform inversion with dark fibers

Authors

Shaikhsulaiman,  Ali
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bodwen,  Daniel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fichtner,  Andreas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bozdag,  Ebru
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Konca,  A. Ozgun
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ergintav,  Semih
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ertan,  Esra
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Yavuz,  Evrim
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bostancioglu,  Isra
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ünlü,  Muhammed
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Shaikhsulaiman, A., Bodwen, D., Fichtner, A., Bozdag, E., Konca, A. O., Ergintav, S., Ertan, E., Yavuz, E., Bostancioglu, I., Ünlü, M. (2023): DAS Istanbul: From detecting the 2023 East Anatolian earthquakes to full-waveform inversion with dark fibers, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2693


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019193
Abstract
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.