Observations of the azimuthal dependence of normal mode coupling below 4 mHz at the South Pole and its nearby stations: Insights into the anisotropy beneath the Transantarctic Mountains

Hu, Xiao

doi:10.1016/j.pepi.2016.05.011

Cited by 2 publications

(1 citation statement)

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“…Regional large data sets of anisotropic structures can provide a new constraint on the tectonic history and geodynamics of the upper mantle below the region. However, few anisotropic data sets have been obtained in West Antarctica because of the limited coverage of seismic stations (e.g., Accardo et al., 2014; Barklage et al., 2009; Graw & Hansen, 2017; Hu, 2016; Salimbeni et al., 2010). Seismic stations in West Antarctica are mainly installed at the edges around the RSE and TAM, eastern WARS, and MBL; therefore, no shear‐wave splitting measurements have been taken in the majority of WARS, especially in the RSE.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy Gradients in the Middle of the Ross Sea Embayment, West Antarctica: Evidence From QL Scattered Surface Waves

Cheng

Liu

2021

Geophysical Research Letters

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Long‐period quasi‐Love (QL) waves in West Antarctica were detected using the band‐pass filtering. Rayleigh waves from March 11, 2011 Tohoku Mw 9.1 earthquake and March 9, 2011 Tohoku Mw 7.3 earthquake had evident QL waves in the frequency range of 7–13 mHz when crossing the Ross Sea Embayment (RSE), while exhibiting normal behavior when crossing the Southern Ocean adjacent to the RSE. We located an anisotropic boundary in the upper mantle beneath the RSE according to the QL waves. Surprisingly, the boundary was consistent with the sharp transition zone of magnetic anomalies discovered by the most recent airborne magnetic surveys. Thus, we speculate that the anisotropic boundary was most likely due to vertical mantle flow below the RSE, which may provide evidence of a vertically coherent boundary condition in the RSE. That anisotropic boundary may be an important tectonic imprint for maintaining the stability of the Ross Ice Shelf.

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