Shear-wave detection of asymmetric c-axis fabrics in the GISP2 ice core, Greenland
Abstract c -axis fabrics of the GISP2 ice core from central Greenland have been measured rapidly and accurately in the field, using both compressional and shear waves generated by an inexpensive, commercially available, “idiot-proof” device. Compressional-wave data were collected at 10 m intervals f...
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Online Access: | http://dx.doi.org/10.1017/s0022143000012363 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000012363 |
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crcambridgeupr:10.1017/s0022143000012363 2024-04-28T08:21:14+00:00 Shear-wave detection of asymmetric c-axis fabrics in the GISP2 ice core, Greenland Anandakrishnan, S. Fltzpatrick, J.J. Alley, R.B. Gow, A.J. Meese, D.A. 1994 http://dx.doi.org/10.1017/s0022143000012363 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000012363 en eng Cambridge University Press (CUP) Journal of Glaciology volume 40, issue 136, page 491-496 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1994 crcambridgeupr https://doi.org/10.1017/s0022143000012363 2024-04-02T06:55:30Z Abstract c -axis fabrics of the GISP2 ice core from central Greenland have been measured rapidly and accurately in the field, using both compressional and shear waves generated by an inexpensive, commercially available, “idiot-proof” device. Compressional-wave data were collected at 10 m intervals for the upper 2250 m of the ice sheet and show progressive clustering of c axes toward the vertical with increasing depth but no large steps at climatic boundaries in the core. The degree of clustering measured by ultrasound agrees closely with that measured using traditional optical techniques but the ultrasound technique is easier and faster than optical methods. A slight asymmetry in the c -axis clustering is revealed by the shear-wave data and increases with increasing depth, indicating that deformation is not symmetric about the vertical at the site. Article in Journal/Newspaper Greenland ice core Ice Sheet Journal of Glaciology Cambridge University Press Journal of Glaciology 40 136 491 496 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Anandakrishnan, S. Fltzpatrick, J.J. Alley, R.B. Gow, A.J. Meese, D.A. Shear-wave detection of asymmetric c-axis fabrics in the GISP2 ice core, Greenland |
topic_facet |
Earth-Surface Processes |
description |
Abstract c -axis fabrics of the GISP2 ice core from central Greenland have been measured rapidly and accurately in the field, using both compressional and shear waves generated by an inexpensive, commercially available, “idiot-proof” device. Compressional-wave data were collected at 10 m intervals for the upper 2250 m of the ice sheet and show progressive clustering of c axes toward the vertical with increasing depth but no large steps at climatic boundaries in the core. The degree of clustering measured by ultrasound agrees closely with that measured using traditional optical techniques but the ultrasound technique is easier and faster than optical methods. A slight asymmetry in the c -axis clustering is revealed by the shear-wave data and increases with increasing depth, indicating that deformation is not symmetric about the vertical at the site. |
format |
Article in Journal/Newspaper |
author |
Anandakrishnan, S. Fltzpatrick, J.J. Alley, R.B. Gow, A.J. Meese, D.A. |
author_facet |
Anandakrishnan, S. Fltzpatrick, J.J. Alley, R.B. Gow, A.J. Meese, D.A. |
author_sort |
Anandakrishnan, S. |
title |
Shear-wave detection of asymmetric c-axis fabrics in the GISP2 ice core, Greenland |
title_short |
Shear-wave detection of asymmetric c-axis fabrics in the GISP2 ice core, Greenland |
title_full |
Shear-wave detection of asymmetric c-axis fabrics in the GISP2 ice core, Greenland |
title_fullStr |
Shear-wave detection of asymmetric c-axis fabrics in the GISP2 ice core, Greenland |
title_full_unstemmed |
Shear-wave detection of asymmetric c-axis fabrics in the GISP2 ice core, Greenland |
title_sort |
shear-wave detection of asymmetric c-axis fabrics in the gisp2 ice core, greenland |
publisher |
Cambridge University Press (CUP) |
publishDate |
1994 |
url |
http://dx.doi.org/10.1017/s0022143000012363 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000012363 |
genre |
Greenland ice core Ice Sheet Journal of Glaciology |
genre_facet |
Greenland ice core Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 40, issue 136, page 491-496 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000012363 |
container_title |
Journal of Glaciology |
container_volume |
40 |
container_issue |
136 |
container_start_page |
491 |
op_container_end_page |
496 |
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1797583691340316672 |