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  Distributed Acoustic Sensing in the Puget Sound and Puget Lowlands, Washington, USA

Lipovsky, B., Elgueta, V., Ni, Y., Denolle, M., Winebrenner, D., Holberg, L., Zumberge, M. (2023): Distributed Acoustic Sensing in the Puget Sound and Puget Lowlands, Washington, USA, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-5012

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021411 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021411_2
Genre: Conference Paper

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 Creators:
Lipovsky, Bradley1, Author
Elgueta, Veronica1, Author
Ni, Yiyu1, Author
Denolle, Marine1, Author
Winebrenner, Dale1, Author
Holberg, Leo1, Author
Zumberge, Mark1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The recent democratization of optical fiber geophysics opens new inroads to explore complex and difficult-to-access wave propagation environments. Here, we present an analysis of one year of continuous Distributed Acoustic Sensing (DAS) data recorded along two optical fiber cables located in the Puget Sound and Puget Lowlands, Washington, USA. The first cable is 12 km long and includes a 4 km long subsea component (average ~100 m water depth) and the second cable is 30 km long in an urban to suburban setting. Both DAS deployments make use of a Sintela Onyx interrogator. During the observation time, interrogators on both fibers observe local, regional, and teleseismic earthquakes. We find that the overall detection threshold for our terrestrial DAS observations is equal to and in some cases slightly better than the urban seismometers of the Pacific Northwest Seismic Network (PNSN). In addition to DAS, we present concurrent Ultrastable Laser Interferometry (ULI) observations on fiber in the same cable as one used for DAS. Distant teleseismic earthquakes provide a means to compare DAS and ULI strain measurements and yield strain correlation coefficients greater than .95. Regional earthquakes generate subsea Scholte waves and thereby enable a lower detection threshold than PNSN stations. A fiber running through the city of Seattle is used to map the spatial variability of engineering site parameters such as VS30. These results point the way to several areas of progress in understanding earthquake hazard including using optical fiber geophysics.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-5012
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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
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