Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet
During summer 2011, seismic activity in the ablation zone of the western Greenland ice sheet (GrIS) was monitored using a network of three-component seismometers. The seismic record includes a large variety of icequakes and seismic tremors that demonstrate a clear correlation with subglacial water f...
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International Glaciological Society
2014
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ftunivzuerich:oai:www.zora.uzh.ch:101735 2024-05-12T08:04:01+00:00 Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet Röösli, Claudia Walter, Fabian Husen, Stephan Andrews, Lauren C Lüthi, Martin P Catania, Ginny A Kissling, Edi 2014 application/pdf https://www.zora.uzh.ch/id/eprint/101735/ https://www.zora.uzh.ch/id/eprint/101735/1/2014%20L%C3%BCthiM_s14%20.pdf https://doi.org/10.5167/uzh-101735 https://doi.org/10.3189/2014JoG13J210 eng eng International Glaciological Society https://www.zora.uzh.ch/id/eprint/101735/1/2014%20L%C3%BCthiM_s14%20.pdf doi:10.5167/uzh-101735 doi:10.3189/2014JoG13J210 urn:issn:0022-1430 info:eu-repo/semantics/openAccess Röösli, Claudia; Walter, Fabian; Husen, Stephan; Andrews, Lauren C; Lüthi, Martin P; Catania, Ginny A; Kissling, Edi (2014). Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet. Journal of Glaciology, 60(221):563-575. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftunivzuerich https://doi.org/10.5167/uzh-10173510.3189/2014JoG13J210 2024-04-17T15:17:43Z During summer 2011, seismic activity in the ablation zone of the western Greenland ice sheet (GrIS) was monitored using a network of three-component seismometers. The seismic record includes a large variety of icequakes and seismic tremors that demonstrate a clear correlation with subglacial water flow. We verified the existence of well-known shallow icequakes (related to surface crevasse formation), deep icequakes (located at 100–160m depth) and narrow-banded short-term seismic tremors (tens of seconds in duration). In addition, we present previously unreported long-term tremors lasting several hours. Using attenuation of the measured tremor amplitude, we locate the epicentre of this long-term tremor to a large moulin within our study area. Between 3 and 11 Hz, our continuous seismic record is dominated by this ‘moulin tremor’ and shows strong correlation with the water level of the generating moulin. We argue that monitoring of icequake and glacial tremor sources bears high potential for investigating glacier hydraulics and dynamics, and is thus an ideal supplement to traditional glaciological measurements. Article in Journal/Newspaper glacier Greenland Ice Sheet Journal of Glaciology University of Zurich (UZH): ZORA (Zurich Open Repository and Archive Greenland |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel Röösli, Claudia Walter, Fabian Husen, Stephan Andrews, Lauren C Lüthi, Martin P Catania, Ginny A Kissling, Edi Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet |
topic_facet |
Institute of Geography 910 Geography & travel |
description |
During summer 2011, seismic activity in the ablation zone of the western Greenland ice sheet (GrIS) was monitored using a network of three-component seismometers. The seismic record includes a large variety of icequakes and seismic tremors that demonstrate a clear correlation with subglacial water flow. We verified the existence of well-known shallow icequakes (related to surface crevasse formation), deep icequakes (located at 100–160m depth) and narrow-banded short-term seismic tremors (tens of seconds in duration). In addition, we present previously unreported long-term tremors lasting several hours. Using attenuation of the measured tremor amplitude, we locate the epicentre of this long-term tremor to a large moulin within our study area. Between 3 and 11 Hz, our continuous seismic record is dominated by this ‘moulin tremor’ and shows strong correlation with the water level of the generating moulin. We argue that monitoring of icequake and glacial tremor sources bears high potential for investigating glacier hydraulics and dynamics, and is thus an ideal supplement to traditional glaciological measurements. |
format |
Article in Journal/Newspaper |
author |
Röösli, Claudia Walter, Fabian Husen, Stephan Andrews, Lauren C Lüthi, Martin P Catania, Ginny A Kissling, Edi |
author_facet |
Röösli, Claudia Walter, Fabian Husen, Stephan Andrews, Lauren C Lüthi, Martin P Catania, Ginny A Kissling, Edi |
author_sort |
Röösli, Claudia |
title |
Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet |
title_short |
Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet |
title_full |
Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet |
title_fullStr |
Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet |
title_full_unstemmed |
Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet |
title_sort |
sustained seismic tremors and icequakes detected in the ablation zone of the greenland ice sheet |
publisher |
International Glaciological Society |
publishDate |
2014 |
url |
https://www.zora.uzh.ch/id/eprint/101735/ https://www.zora.uzh.ch/id/eprint/101735/1/2014%20L%C3%BCthiM_s14%20.pdf https://doi.org/10.5167/uzh-101735 https://doi.org/10.3189/2014JoG13J210 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet Journal of Glaciology |
genre_facet |
glacier Greenland Ice Sheet Journal of Glaciology |
op_source |
Röösli, Claudia; Walter, Fabian; Husen, Stephan; Andrews, Lauren C; Lüthi, Martin P; Catania, Ginny A; Kissling, Edi (2014). Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet. Journal of Glaciology, 60(221):563-575. |
op_relation |
https://www.zora.uzh.ch/id/eprint/101735/1/2014%20L%C3%BCthiM_s14%20.pdf doi:10.5167/uzh-101735 doi:10.3189/2014JoG13J210 urn:issn:0022-1430 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5167/uzh-10173510.3189/2014JoG13J210 |
_version_ |
1798846138649935872 |