Glacial rumblings from Jakobshavn ice stream, Greenland
Abstract The steep increase in Greenland’s glacial earthquake activity detected by the Global Seismographic Network since the late 1990s suggests that a close inspection of these events might provide clues to the nature and origin of such seismic activity. Here we discuss the detection of large, une...
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ftcarolinadr:cdr.lib.unc.edu:d504rv49q 2023-09-05T13:17:30+02:00 Glacial rumblings from Jakobshavn ice stream, Greenland Rial, J. A. Tang, C. Steffen, K. University of North Carolina at Chapel Hill 2009 https://doi.org/10.17615/rjeq-6446 https://cdr.lib.unc.edu/downloads/z890s3507?file=thumbnail https://cdr.lib.unc.edu/downloads/z890s3507 English eng https://doi.org/10.17615/rjeq-6446 https://cdr.lib.unc.edu/downloads/z890s3507?file=thumbnail https://cdr.lib.unc.edu/downloads/z890s3507 http://rightsstatements.org/vocab/InC/1.0/ Journal of Glaciology, 55(191) Réseau sismographe Greenland Seismograph network Sismicité Réseau observation Ice stream Donnée observation polar regions Sismicidad seismicity icequakes Arctique Polar region Outlet glacier Séisme glace Région Polaire Observation data Groenland Groenland Ouest Zone polaire Observational network Fleuve glace Arctic region West Greenland Glacier émissaire Jakobshavn Isbrae Article 2009 ftcarolinadr https://doi.org/10.17615/rjeq-6446 2023-08-19T22:24:56Z Abstract The steep increase in Greenland’s glacial earthquake activity detected by the Global Seismographic Network since the late 1990s suggests that a close inspection of these events might provide clues to the nature and origin of such seismic activity. Here we discuss the detection of large, unexpected seismic events of extraordinarily long duration (10–40 min) occurring about once every 2 days, and localized in the ice stream that feeds the Earth’s fastest-moving glacier (Jakobshavn Isbræ) from the east. These ‘glacial rumblings’ represent an ice-mass wasting process that is greater and more frequent than glacial earthquakes have suggested. Probably triggered by calving, the rumblings are all very similar regardless of duration, and all end with a sharp, earthquake-like event in which the largest seismic amplitude is in the rumbling and that might signal the collapse of large ice masses upstream. By calculating the total amount of seismic energy released as rumblings, we estimate that the maximum seasonal amount of ice moved seismogenically down the ice stream is up to 12 km 3 , or ∼30% of the average annual iceberg discharge in Jakobshavn. Article in Journal/Newspaper Arctic Arctique* glacier Greenland Groenland Iceberg* Jakobshavn Jakobshavn isbræ Journal of Glaciology Carolina Digital Repository (UNC - University of North Carolina) Arctic Greenland Jakobshavn Isbræ ENVELOPE(-49.917,-49.917,69.167,69.167) |
institution |
Open Polar |
collection |
Carolina Digital Repository (UNC - University of North Carolina) |
op_collection_id |
ftcarolinadr |
language |
English |
topic |
Réseau sismographe Greenland Seismograph network Sismicité Réseau observation Ice stream Donnée observation polar regions Sismicidad seismicity icequakes Arctique Polar region Outlet glacier Séisme glace Région Polaire Observation data Groenland Groenland Ouest Zone polaire Observational network Fleuve glace Arctic region West Greenland Glacier émissaire Jakobshavn Isbrae |
spellingShingle |
Réseau sismographe Greenland Seismograph network Sismicité Réseau observation Ice stream Donnée observation polar regions Sismicidad seismicity icequakes Arctique Polar region Outlet glacier Séisme glace Région Polaire Observation data Groenland Groenland Ouest Zone polaire Observational network Fleuve glace Arctic region West Greenland Glacier émissaire Jakobshavn Isbrae Rial, J. A. Tang, C. Steffen, K. Glacial rumblings from Jakobshavn ice stream, Greenland |
topic_facet |
Réseau sismographe Greenland Seismograph network Sismicité Réseau observation Ice stream Donnée observation polar regions Sismicidad seismicity icequakes Arctique Polar region Outlet glacier Séisme glace Région Polaire Observation data Groenland Groenland Ouest Zone polaire Observational network Fleuve glace Arctic region West Greenland Glacier émissaire Jakobshavn Isbrae |
description |
Abstract The steep increase in Greenland’s glacial earthquake activity detected by the Global Seismographic Network since the late 1990s suggests that a close inspection of these events might provide clues to the nature and origin of such seismic activity. Here we discuss the detection of large, unexpected seismic events of extraordinarily long duration (10–40 min) occurring about once every 2 days, and localized in the ice stream that feeds the Earth’s fastest-moving glacier (Jakobshavn Isbræ) from the east. These ‘glacial rumblings’ represent an ice-mass wasting process that is greater and more frequent than glacial earthquakes have suggested. Probably triggered by calving, the rumblings are all very similar regardless of duration, and all end with a sharp, earthquake-like event in which the largest seismic amplitude is in the rumbling and that might signal the collapse of large ice masses upstream. By calculating the total amount of seismic energy released as rumblings, we estimate that the maximum seasonal amount of ice moved seismogenically down the ice stream is up to 12 km 3 , or ∼30% of the average annual iceberg discharge in Jakobshavn. |
author2 |
University of North Carolina at Chapel Hill |
format |
Article in Journal/Newspaper |
author |
Rial, J. A. Tang, C. Steffen, K. |
author_facet |
Rial, J. A. Tang, C. Steffen, K. |
author_sort |
Rial, J. A. |
title |
Glacial rumblings from Jakobshavn ice stream, Greenland |
title_short |
Glacial rumblings from Jakobshavn ice stream, Greenland |
title_full |
Glacial rumblings from Jakobshavn ice stream, Greenland |
title_fullStr |
Glacial rumblings from Jakobshavn ice stream, Greenland |
title_full_unstemmed |
Glacial rumblings from Jakobshavn ice stream, Greenland |
title_sort |
glacial rumblings from jakobshavn ice stream, greenland |
publishDate |
2009 |
url |
https://doi.org/10.17615/rjeq-6446 https://cdr.lib.unc.edu/downloads/z890s3507?file=thumbnail https://cdr.lib.unc.edu/downloads/z890s3507 |
long_lat |
ENVELOPE(-49.917,-49.917,69.167,69.167) |
geographic |
Arctic Greenland Jakobshavn Isbræ |
geographic_facet |
Arctic Greenland Jakobshavn Isbræ |
genre |
Arctic Arctique* glacier Greenland Groenland Iceberg* Jakobshavn Jakobshavn isbræ Journal of Glaciology |
genre_facet |
Arctic Arctique* glacier Greenland Groenland Iceberg* Jakobshavn Jakobshavn isbræ Journal of Glaciology |
op_source |
Journal of Glaciology, 55(191) |
op_relation |
https://doi.org/10.17615/rjeq-6446 https://cdr.lib.unc.edu/downloads/z890s3507?file=thumbnail https://cdr.lib.unc.edu/downloads/z890s3507 |
op_rights |
http://rightsstatements.org/vocab/InC/1.0/ |
op_doi |
https://doi.org/10.17615/rjeq-6446 |
_version_ |
1776198654790467584 |