Short-period observations of speed, strain and seismicity on Ice Stream B, Antarctica
Abstract The speed of Ice Stream B, Antarctica, was measured twice a day-over a 1 month study period, and found to be steady at about the ±3½% level, the sensitivity of the measurements. The vertical strain was measured at three sites over a 1 year period at 1 h intervals with sensitivities of 2 or...
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Cambridge University Press (CUP)
1993
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crcambridgeupr:10.1017/s002214300001635x 2024-03-03T08:37:15+00:00 Short-period observations of speed, strain and seismicity on Ice Stream B, Antarctica Harrison, W. D. Echelmeyer, K. A. Engelhardt, H. 1993 http://dx.doi.org/10.1017/s002214300001635x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001635X en eng Cambridge University Press (CUP) Journal of Glaciology volume 39, issue 133, page 463-470 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1993 crcambridgeupr https://doi.org/10.1017/s002214300001635x 2024-02-08T08:34:04Z Abstract The speed of Ice Stream B, Antarctica, was measured twice a day-over a 1 month study period, and found to be steady at about the ±3½% level, the sensitivity of the measurements. The vertical strain was measured at three sites over a 1 year period at 1 h intervals with sensitivities of 2 or 0.2 ppm. The strain rate varied on all time-scales. Events of high strain rate were observed, but never at more than one site at a time. They can probably be understood in terms of local modification of the strain field associated with crevassing. Diurnal variation in strain rate was observed at one and possibly two sites during two summers. The seismicity was measured at all three sites, and diurnal and seasonal variations were prominent at all, the seismicity being much more intense in winter. Several possible causes of the diurnal variations in strain and seismicity are considered: thermal and atmospheric effects, and the effects of tides in the Ross Sea. Article in Journal/Newspaper Antarc* Antarctica Ice Stream B Journal of Glaciology Ross Sea Cambridge University Press Ross Sea Journal of Glaciology 39 133 463 470 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Harrison, W. D. Echelmeyer, K. A. Engelhardt, H. Short-period observations of speed, strain and seismicity on Ice Stream B, Antarctica |
topic_facet |
Earth-Surface Processes |
description |
Abstract The speed of Ice Stream B, Antarctica, was measured twice a day-over a 1 month study period, and found to be steady at about the ±3½% level, the sensitivity of the measurements. The vertical strain was measured at three sites over a 1 year period at 1 h intervals with sensitivities of 2 or 0.2 ppm. The strain rate varied on all time-scales. Events of high strain rate were observed, but never at more than one site at a time. They can probably be understood in terms of local modification of the strain field associated with crevassing. Diurnal variation in strain rate was observed at one and possibly two sites during two summers. The seismicity was measured at all three sites, and diurnal and seasonal variations were prominent at all, the seismicity being much more intense in winter. Several possible causes of the diurnal variations in strain and seismicity are considered: thermal and atmospheric effects, and the effects of tides in the Ross Sea. |
format |
Article in Journal/Newspaper |
author |
Harrison, W. D. Echelmeyer, K. A. Engelhardt, H. |
author_facet |
Harrison, W. D. Echelmeyer, K. A. Engelhardt, H. |
author_sort |
Harrison, W. D. |
title |
Short-period observations of speed, strain and seismicity on Ice Stream B, Antarctica |
title_short |
Short-period observations of speed, strain and seismicity on Ice Stream B, Antarctica |
title_full |
Short-period observations of speed, strain and seismicity on Ice Stream B, Antarctica |
title_fullStr |
Short-period observations of speed, strain and seismicity on Ice Stream B, Antarctica |
title_full_unstemmed |
Short-period observations of speed, strain and seismicity on Ice Stream B, Antarctica |
title_sort |
short-period observations of speed, strain and seismicity on ice stream b, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1017/s002214300001635x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001635X |
geographic |
Ross Sea |
geographic_facet |
Ross Sea |
genre |
Antarc* Antarctica Ice Stream B Journal of Glaciology Ross Sea |
genre_facet |
Antarc* Antarctica Ice Stream B Journal of Glaciology Ross Sea |
op_source |
Journal of Glaciology volume 39, issue 133, page 463-470 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s002214300001635x |
container_title |
Journal of Glaciology |
container_volume |
39 |
container_issue |
133 |
container_start_page |
463 |
op_container_end_page |
470 |
_version_ |
1792497813896036352 |