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  Sensing Optical Fibers for Earthquake Source Characterization Using Raw DAS Records

Strumia, C., Trabattoni, A., Supino, M., Baillet, M., Rivet, D., Festa, G. (2024): Sensing Optical Fibers for Earthquake Source Characterization Using Raw DAS Records. - Journal of Geophysical Research: Solid Earth, 129, 1, e2023JB027860.
https://doi.org/10.1029/2023JB027860

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5025201 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5025201_1
Genre: Journal Article

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 Creators:
Strumia, Claudio1, 2, Author
Trabattoni, Alister1, 2, Author
Supino, Mariano1, 2, Author
Baillet, Marie1, 2, Author
Rivet, Diane1, 2, Author
Festa, Gaetano1, 2, Author
Affiliations:
1External Organizations, ou_persistent22              
2Geo-INQUIRE, External Organizations, ou_5025076              

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 Abstract: Distributed Acoustic Sensing (DAS) is becoming a powerful tool for earthquake monitoring, providing continuous strain-rate records of seismic events along fiber optic cables. However, the use of standard seismological techniques for earthquake source characterization requires the conversion of data in ground motion quantities. In this study we provide a new formulation for far-field strain radiation emitted by a seismic rupture, which allows to directly analyze DAS data in their native physical quantity. This formulation naturally accounts for the complex directional sensitivity of the fiber to body waves and to the shallow layering beneath the cable. In this domain, we show that the spectral amplitude of the strain integral is related to the Fourier transform of the source time function, and its modeling allows to determine the source parameters. We demonstrate the validity of the technique on two case-studies, where source parameters are consistent with estimates from standard seismic instruments in magnitude range 2.0–4.3. When analyzing events from a 1-month DAS survey in Chile, moment-corner frequency distribution shows scale invariant stress drop estimates, with an average of Δσ = (0.8 ± 0.6) MPa. Analysis of DAS data acquired in the Southern Apennines shows a dominance of the local attenuation that masks the effective corner frequency of the events. After estimating the local attenuation coefficient, we were able to retrieve the corner frequencies for the largest magnitude events in the catalog. Overall, this approach shows the capability of DAS technology to depict the characteristic scales of seismic sources and the released moment.

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Language(s): eng - English
 Dates: 2024-01-232024
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1029/2023JB027860
 Degree: -

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Project name : Geo-INQUIRE
Grant ID : 101058518
Funding program : Horizon Europe (HE)
Funding organization : European Commission (EC)

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Title: Journal of Geophysical Research: Solid Earth
Source Genre: Journal, SCI, Scopus
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Publ. Info: -
Pages: - Volume / Issue: 129 (1) Sequence Number: e2023JB027860 Start / End Page: - Identifier: ISSN: 2169-9313
ISSN: 2169-9356
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/jgr_solid_earth