Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland
Preferred crystal orientation fabrics (COFs) within an ice sheet or glacier are typically found from ice cores. We conducted experiments at the North Greenland Eemian Ice Drilling (NEEM) facility ice core location, where COF data were available at Jakobshavn Isbræ west Greenland, to test if COF can...
Published in: | GEOPHYSICS |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Society of Exploration Geophysicists
2017
|
Subjects: | |
Online Access: | http://hdl.handle.net/1808/25010 https://doi.org/10.1190/geo2015-0154.1 |
id |
ftunivkansas:oai:kuscholarworks.ku.edu:1808/25010 |
---|---|
record_format |
openpolar |
spelling |
ftunivkansas:oai:kuscholarworks.ku.edu:1808/25010 2023-05-15T16:21:08+02:00 Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland Velez Gonzalez, Jose Antonio Tsoflias, Georgios P. Black, Ross A. Vanderveen, Cornelis J. Anandakrishnan, Sridhar 2017-09-22T19:52:44Z http://hdl.handle.net/1808/25010 https://doi.org/10.1190/geo2015-0154.1 unknown Society of Exploration Geophysicists Vélez, J. A., Tsoflias, G. P., Black, R. A., Veen, C. J., & Anandakrishnan, S. (2016). Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland. Geophysics, 81(1). doi:10.1190/geo2015-0154.1 http://hdl.handle.net/1808/25010 doi:10.1190/geo2015-0154.1 © 2016 Society of Exploration Geophysicists. All rights reserved. openAccess Anisotropy P-wave Reflection Article 2017 ftunivkansas https://doi.org/10.1190/geo2015-0154.1 2022-08-26T13:22:07Z Preferred crystal orientation fabrics (COFs) within an ice sheet or glacier are typically found from ice cores. We conducted experiments at the North Greenland Eemian Ice Drilling (NEEM) facility ice core location, where COF data were available at Jakobshavn Isbræ west Greenland, to test if COF can be determined seismically. We used observations of anisotropic seismic wave propagation on multioffset gathers and englacial imaging from a 2D reflection profile. Anisotropy analysis of the NEEM data yielded mean c-axes distributed over a conical region of 30° to 32° from vertical. No internal ice seismic reflectors were imaged. Direct COF measurements collected in the ice core agreed with the seismic observations. At Jakobshavn Isbræ, we used a multioffset gather and a 2D reflection profile, but we lacked ice core data. Englacial reflectors allowed the determination of ice column interval properties. Anisotropy analysis found that the upper 1640 m of the ice column consisted of cold (≈−10°C≈−10°C) and mostly isotropic ice with c-axes distributed over a conical region of 80° from vertical. The lower 300 m of the ice column was characterized by warm (>−10°C>−10°C) ice with COF. These observations were consistent with complex ice fabric development and temperature estimations over the same region of Jakobshavn Isbræ. This study demonstrated that the ice sheet and glacier ice anisotropy information can be gained from seismic field observations. Article in Journal/Newspaper glacier Greenland ice core Ice Sheet Jakobshavn Jakobshavn isbræ North Greenland The University of Kansas: KU ScholarWorks Greenland Jakobshavn Isbræ ENVELOPE(-49.917,-49.917,69.167,69.167) GEOPHYSICS 81 1 WA111 WA118 |
institution |
Open Polar |
collection |
The University of Kansas: KU ScholarWorks |
op_collection_id |
ftunivkansas |
language |
unknown |
topic |
Anisotropy P-wave Reflection |
spellingShingle |
Anisotropy P-wave Reflection Velez Gonzalez, Jose Antonio Tsoflias, Georgios P. Black, Ross A. Vanderveen, Cornelis J. Anandakrishnan, Sridhar Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland |
topic_facet |
Anisotropy P-wave Reflection |
description |
Preferred crystal orientation fabrics (COFs) within an ice sheet or glacier are typically found from ice cores. We conducted experiments at the North Greenland Eemian Ice Drilling (NEEM) facility ice core location, where COF data were available at Jakobshavn Isbræ west Greenland, to test if COF can be determined seismically. We used observations of anisotropic seismic wave propagation on multioffset gathers and englacial imaging from a 2D reflection profile. Anisotropy analysis of the NEEM data yielded mean c-axes distributed over a conical region of 30° to 32° from vertical. No internal ice seismic reflectors were imaged. Direct COF measurements collected in the ice core agreed with the seismic observations. At Jakobshavn Isbræ, we used a multioffset gather and a 2D reflection profile, but we lacked ice core data. Englacial reflectors allowed the determination of ice column interval properties. Anisotropy analysis found that the upper 1640 m of the ice column consisted of cold (≈−10°C≈−10°C) and mostly isotropic ice with c-axes distributed over a conical region of 80° from vertical. The lower 300 m of the ice column was characterized by warm (>−10°C>−10°C) ice with COF. These observations were consistent with complex ice fabric development and temperature estimations over the same region of Jakobshavn Isbræ. This study demonstrated that the ice sheet and glacier ice anisotropy information can be gained from seismic field observations. |
format |
Article in Journal/Newspaper |
author |
Velez Gonzalez, Jose Antonio Tsoflias, Georgios P. Black, Ross A. Vanderveen, Cornelis J. Anandakrishnan, Sridhar |
author_facet |
Velez Gonzalez, Jose Antonio Tsoflias, Georgios P. Black, Ross A. Vanderveen, Cornelis J. Anandakrishnan, Sridhar |
author_sort |
Velez Gonzalez, Jose Antonio |
title |
Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland |
title_short |
Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland |
title_full |
Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland |
title_fullStr |
Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland |
title_full_unstemmed |
Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland |
title_sort |
distribution of preferred ice crystal orientation determined from seismic anisotropy: evidence from jakobshavn isbræ and the north greenland eemian ice drilling facility, greenland |
publisher |
Society of Exploration Geophysicists |
publishDate |
2017 |
url |
http://hdl.handle.net/1808/25010 https://doi.org/10.1190/geo2015-0154.1 |
long_lat |
ENVELOPE(-49.917,-49.917,69.167,69.167) |
geographic |
Greenland Jakobshavn Isbræ |
geographic_facet |
Greenland Jakobshavn Isbræ |
genre |
glacier Greenland ice core Ice Sheet Jakobshavn Jakobshavn isbræ North Greenland |
genre_facet |
glacier Greenland ice core Ice Sheet Jakobshavn Jakobshavn isbræ North Greenland |
op_relation |
Vélez, J. A., Tsoflias, G. P., Black, R. A., Veen, C. J., & Anandakrishnan, S. (2016). Distribution of preferred ice crystal orientation determined from seismic anisotropy: Evidence from Jakobshavn Isbræ and the North Greenland Eemian Ice Drilling facility, Greenland. Geophysics, 81(1). doi:10.1190/geo2015-0154.1 http://hdl.handle.net/1808/25010 doi:10.1190/geo2015-0154.1 |
op_rights |
© 2016 Society of Exploration Geophysicists. All rights reserved. openAccess |
op_doi |
https://doi.org/10.1190/geo2015-0154.1 |
container_title |
GEOPHYSICS |
container_volume |
81 |
container_issue |
1 |
container_start_page |
WA111 |
op_container_end_page |
WA118 |
_version_ |
1766009146440679424 |