Comparison of elastic moduli from seismic diving-wave and ice-core microstructure analysis in Antarctic polar firn

• DOI: 10.1017/aog.2019.10
• Publication Date: 2019-04-25T08:51:41Z
• Authors: Rebecca Schlegel; Anja Diez; Henning Löwe; Christoph Mayer; Astrid Lambrecht; Johannes Freitag; Heinrich Miller; Coen Hofstede; Olaf Eisen
• Keywords: Firn; Ice core

ABSTRACT We compared elastic moduli in polar firn derived from diving wave refraction seismic velocity analysis, firn-core density measurements and microstructure modelling based on data. The data were obtained with a small electrodynamic vibrator source near Kohnen Station, East Antarctica. analysis of waves resulted velocity–depth profiles for different types (P-, SH- SV-waves). Dynamic by combining P- S-wave velocities densities measurements. structural finite-element method (FEM) was used to calculate the components tensor X-ray tomography samples at depths 10, 42, 71 99 m, providing static moduli. Shear bulk range 0.39 2.42 GPa 0.68 GPa, respectively. observations FEM agree within 8.5% deepest achieved values depth are uncertainty range. Our demonstrate that can be consistently two independent methods which dynamic (seismic) (tomography FEM) observations, respectively, deeper layers below ~10 m depth.