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Interpreting Ice Anisotropy of Greenland's Fastest Outlet Glacier Using Basal Icequakes
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Interpreting Ice Anisotropy of Greenland's Fastest Outlet Glacier Using Basal Icequakes
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Interpreting Ice Anisotropy of Greenland's Fastest Outlet Glacier Using Basal Icequakes
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Journal Article
Interpreting Ice Anisotropy of Greenland's Fastest Outlet Glacier Using Basal Icequakes
2025
Overview
Ice anisotropy can have significant impact on ice rheology and flow dynamics. However, a lack of in situ measurements limits the validation and incorporation of anisotropy, so most ice flow models assume isotropic ice. Especially observations of anisotropy in fast‐flowing ice streams are scarce. Here, we present an assessment of anisotropic ice fabric inside a fast‐flowing Greenlandic ice stream. Seismic anisotropy, measured through shear wave splitting in basal icequakes, reveals an anisotropic horizontal cone fabric. The corresponding fabric tensor suggests that ice likely deforms at least seven times easier along‐flow than across‐flow. The presence of such a strong anisotropic fabric within the fast‐flowing ice stream emphasizes that assuming isotropic fabric in ice flow models likely introduces significant inaccuracies. Furthermore, variations between our observations and measurements from other regions highlight the necessity of comprehensive in situ data to better understand spatial variations in ice anisotropy and how fabrics develop.
