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  Seismic Ambient Noise Interferometry along Optical Fibers: What Insights can Distributed Acoustic Sensing provide?

Isken, M. P., Baird, A., Sens-Schönfelder, C., Sebastian, H., Dahm, T. (2023): Seismic Ambient Noise Interferometry along Optical Fibers: What Insights can Distributed Acoustic Sensing provide?, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4434

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021864 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021864_2
Genre: Conference Paper

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 Creators:
Isken, Marius Paul1, 2, Author              
Baird, Alan2, Author
Sens-Schönfelder, C.2, 3, Author              
Sebastian, Heimann2, Author
Dahm, T.1, 2, Author              
Affiliations:
12.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146029              
2IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              
32.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_30023              

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 Abstract: We explore the ambient noise wave field recorded on different optical fibers interrogated during distributed acoustic sensing (DAS) campaigns in Iceland and Germany. DAS is a relatively new technology that allows for measurements of acoustic strain signals at densely spaced observation points along buried optical fibers. Ambient noise interferometry, in particular single-channel auto-correlation, is potentially a powerful technique for resolving the structure of the subsurface medium and characterizing its properties below a seismic sensor. Combining these two techniques to extract the ambient noise auto-correlation functions from horizontal strain rates all along the densely spaced locations on the fiber we obtain coherent signals that correlate over multiple observation points. We are challenged by the separation of the super-positioned non-stationary ambient noise field and the seismic response of the subsurface. We test our processing workflow and results against independent methods. (1) A controlled vibro-seis experiment and (2) seismic ambient noise analysis of a large-N three-component seismic nodal array which was co-located with the optical fiber in Iceland.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-4434
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -