Deriving micro- to macro-scale seismic velocities from ice-core <i>c</i> axis orientations

Kerch, Johanna; Diez, Anja; Weikusat, Ilka; Eisen, Olaf

doi:https://doi.org/10.5194/tc-12-1715-2018

Articles | Volume 12, issue 5

https://doi.org/10.5194/tc-12-1715-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/tc-12-1715-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 12, issue 5

Research article

|

23 May 2018

Research article |

| 23 May 2018

Deriving micro- to macro-scale seismic velocities from ice-core c axis orientations

Johanna Kerch, Anja Diez, Ilka Weikusat, and Olaf Eisen

Data sets

Crystal c-axes (fabric analyser G50) of ice core samples (vertical thin sections, full bag measurements) collected from the polar ice core EDML, 2359-2380 m depth (2015) Ilka Weikusat, Sepp Kipfstuhl, Jan Eichler, Nicolas Stoll https://doi.org/10.1594/PANGAEA.888576

Crystal c-axes (fabric G50) of ice core samples collected from the EDML ice core with links to raw data files Ilka Weikusat, Sepp Kipfstuhl, Anja Lambrecht https://doi.org/10.1594/PANGAEA.807206

Crystal c-axes (fabric G20) of ice core samples collected from the EDML ice core with links to raw data files Ilka Weikusat, Sepp Kipfstuhl, Anja Lambrecht https://doi.org/10.1594/PANGAEA.807207

Eigenvalues of crystal orientation tensors for c-axes distributions of horizontal thin sections from the EDML ice core Ilka Weikusat, Anja Lambrecht, Sepp Kipfstuhl https://doi.org/10.1594/PANGAEA.807141

Eigenvalues of crystal orientation tensors for c-axes distributions of vertical thin sections from the EDML ice core Ilka Weikusat, Anja Lambrecht, Sepp Kipfstuhl https://doi.org/10.1594/PANGAEA.807142

Eigenvalues of crystal-orientation tensors for c-axes distributions of vertical thin sections from the Alpine ice core KCC (2013) Johanna Kerch, Jan Eichler, Ilka Weikusat, Olaf Eisen https://doi.org/10.1594/PANGAEA.864228

Crystal c-axes (fabric analyser G50) of ice core samples (vertical thin sections) collected from the Alpine ice core KCC (2013) Johanna Kerch, Ilka Weikusat, Daniela Jansen, Olaf Eisen https://doi.org/10.1594/PANGAEA.864226

Short summary

We investigate the effect of crystal anisotropy on seismic velocities in glacier ice by calculating seismic phase velocities using the exact c axis angles to describe the crystal orientations in ice-core samples for an alpine and a polar ice core. Our results provide uncertainty estimates for earlier established approximative calculations. Additionally, our findings highlight the variation in seismic velocity at non-vertical incidence as a function of the horizontal azimuth of the seismic plane.