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  Crevasse-induced Rayleigh-wave azimuthal anisotropy on Glacier de la Plaine Morte, Switzerland

Lindner, F., Laske, G., Walter, F., Doran, A. K. (2019): Crevasse-induced Rayleigh-wave azimuthal anisotropy on Glacier de la Plaine Morte, Switzerland. - Annals of Glaciology, 60, 79, 96-111.
https://doi.org/10.1017/aog.2018.25

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5003669 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5003669_1
Genre: Journal Article

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 Creators:
Lindner, Fabian1, 2, Author
Laske, Gabi1, 2, Author
Walter, Fabian1, 2, Author
Doran, Adrian K.1, 2, Author
Affiliations:
1External Organizations, ou_persistent22              
2Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum, Potsdam, ou_44021              

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 Abstract: Crevasses and englacial fracture networks route meltwater from a glacier's surface to the subglacial drainage system and thus influence glacial hydraulics. However, rapid fracture growth may also lead to sudden and potentially hazardous structural failure of unstable glaciers and ice dams, rifting of ice shelves, or iceberg calving. Here, we use passive seismic recordings to investigate the englacial fracture network on Glacier de la Plaine Morte, Switzerland. Glacier dynamics and the drainage of an ice-marginal lake give rise to numerous icequakes, the majority of which generate dispersed, high-frequency Rayleigh waves. A wide distribution of events allows us to study azimuthal anisotropy between 10 and 30 Hz in order to extract englacial seismic velocities in regions of preferentially oriented crevasses. Beamforming applied to a 100-m-aperture array reveals azimuthal anisotropy of Rayleigh-wave phase velocities reaching a strength of 8% at high frequencies. In addition, we find that the fast direction of wave propagation coincides with the observed surface strike of the narrow crevasses. Forward modeling and inversion of dispersion curves suggest that the azimuthal anisotropy is induced by a 40-m-thick crevassed layer at the surface of the glacier with 8% anisotropy in shear-wave velocity.

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Language(s): eng - English
 Dates: 2018-11-232019
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1017/aog.2018.25
 Degree: -

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Title: Annals of Glaciology
Source Genre: Journal, SCI, Scopus, oa, ab 2016 oa; scopus bis 2021
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Pages: - Volume / Issue: 60 (79) Sequence Number: - Start / End Page: 96 - 111 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals29