Crevasse Initiation and History within the McMurdo Shear Zone, Antarctica
While large-scale observations of intensified fracture and rifting can be observed through remote-sensing observations, understanding crevasse initiation may best be achieved with small-scale observations in which crevasses can be directly observed. Here we investigate the kinematic drivers of creva...
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ftboisestateu:oai:scholarworks.boisestate.edu:geo_facpubs-1513 2023-11-12T04:06:49+01:00 Crevasse Initiation and History within the McMurdo Shear Zone, Antarctica Kaluzienski, Lynn Koons, Peter Enderlin, Ellyn Hamilton, Gordon Courville, Zoe Arcone, Steven 2019-12-01T08:00:00Z application/pdf https://scholarworks.boisestate.edu/geo_facpubs/511 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1513/viewcontent/Enderlin__Ellyn__2019__Crevasse_Initiation_and_History___PUB.pdf unknown ScholarWorks https://scholarworks.boisestate.edu/geo_facpubs/511 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1513/viewcontent/Enderlin__Ellyn__2019__Crevasse_Initiation_and_History___PUB.pdf http://creativecommons.org/licenses/by/4.0/ Geosciences Faculty Publications and Presentations crevasses ice shelves ground-penetrating radar ice velocity Earth Sciences Geophysics and Seismology text 2019 ftboisestateu 2023-10-20T00:12:49Z While large-scale observations of intensified fracture and rifting can be observed through remote-sensing observations, understanding crevasse initiation may best be achieved with small-scale observations in which crevasses can be directly observed. Here we investigate the kinematic drivers of crevasse initiation in the McMurdo Shear Zone (MSZ), Antarctica. We delineated 420 crevasses from ∼95 km of 400 MHz frequency ground-penetrating radar data and compared these data with kinematic outputs derived from remotely-sensed ice surface velocities to develop a statistical method to estimate crevasse initiation threshold strain rate values. We found the MSZ to be dominated by simple shear and that surface shear strain rates proved best for predicting crevasse features, with regions of higher shear strain rate more likely to have a greater number of crevasses. In the surveyed portion of our study region, values of shear strain rate and vorticity rate derived from the MEaSUREs2 velocity dataset range between 0.005–0.020 and 0.006–0.022 a−1, respectively, with crevasses located at ≥0.011 and ≥0.013 a−1. While threshold values from this study cannot be directly applied to other glacial environments, the method described here should allow for the study of shear margin evolution and assessment of localized damage and weakening processes in other locations where in situ data are available. Text Antarc* Antarctica Ice Shelves Boise State University: Scholar Works |
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Open Polar |
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Boise State University: Scholar Works |
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ftboisestateu |
language |
unknown |
topic |
crevasses ice shelves ground-penetrating radar ice velocity Earth Sciences Geophysics and Seismology |
spellingShingle |
crevasses ice shelves ground-penetrating radar ice velocity Earth Sciences Geophysics and Seismology Kaluzienski, Lynn Koons, Peter Enderlin, Ellyn Hamilton, Gordon Courville, Zoe Arcone, Steven Crevasse Initiation and History within the McMurdo Shear Zone, Antarctica |
topic_facet |
crevasses ice shelves ground-penetrating radar ice velocity Earth Sciences Geophysics and Seismology |
description |
While large-scale observations of intensified fracture and rifting can be observed through remote-sensing observations, understanding crevasse initiation may best be achieved with small-scale observations in which crevasses can be directly observed. Here we investigate the kinematic drivers of crevasse initiation in the McMurdo Shear Zone (MSZ), Antarctica. We delineated 420 crevasses from ∼95 km of 400 MHz frequency ground-penetrating radar data and compared these data with kinematic outputs derived from remotely-sensed ice surface velocities to develop a statistical method to estimate crevasse initiation threshold strain rate values. We found the MSZ to be dominated by simple shear and that surface shear strain rates proved best for predicting crevasse features, with regions of higher shear strain rate more likely to have a greater number of crevasses. In the surveyed portion of our study region, values of shear strain rate and vorticity rate derived from the MEaSUREs2 velocity dataset range between 0.005–0.020 and 0.006–0.022 a−1, respectively, with crevasses located at ≥0.011 and ≥0.013 a−1. While threshold values from this study cannot be directly applied to other glacial environments, the method described here should allow for the study of shear margin evolution and assessment of localized damage and weakening processes in other locations where in situ data are available. |
format |
Text |
author |
Kaluzienski, Lynn Koons, Peter Enderlin, Ellyn Hamilton, Gordon Courville, Zoe Arcone, Steven |
author_facet |
Kaluzienski, Lynn Koons, Peter Enderlin, Ellyn Hamilton, Gordon Courville, Zoe Arcone, Steven |
author_sort |
Kaluzienski, Lynn |
title |
Crevasse Initiation and History within the McMurdo Shear Zone, Antarctica |
title_short |
Crevasse Initiation and History within the McMurdo Shear Zone, Antarctica |
title_full |
Crevasse Initiation and History within the McMurdo Shear Zone, Antarctica |
title_fullStr |
Crevasse Initiation and History within the McMurdo Shear Zone, Antarctica |
title_full_unstemmed |
Crevasse Initiation and History within the McMurdo Shear Zone, Antarctica |
title_sort |
crevasse initiation and history within the mcmurdo shear zone, antarctica |
publisher |
ScholarWorks |
publishDate |
2019 |
url |
https://scholarworks.boisestate.edu/geo_facpubs/511 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1513/viewcontent/Enderlin__Ellyn__2019__Crevasse_Initiation_and_History___PUB.pdf |
genre |
Antarc* Antarctica Ice Shelves |
genre_facet |
Antarc* Antarctica Ice Shelves |
op_source |
Geosciences Faculty Publications and Presentations |
op_relation |
https://scholarworks.boisestate.edu/geo_facpubs/511 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1513/viewcontent/Enderlin__Ellyn__2019__Crevasse_Initiation_and_History___PUB.pdf |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
_version_ |
1782327778843033600 |