Characterization of seasonal glacial seismicity from a single-station on-ice record at Holtedahlfonna, Svalbard
Glacial seismicity provides important insights into glacier dynamic processes. We study the temporal distribution of cryogenic seismic signals (icequakes) at Holtedahlfonna, Svalbard, between April and August 2016 using a single three-component sensor. We investigate sources of observed icequakes us...
Published in: | Annals of Glaciology |
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Language: | English |
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Uppsala universitet, Luft-, vatten- och landskapslära
2019
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ftuppsalauniv:oai:DiVA.org:uu-385388 2023-05-15T13:29:16+02:00 Characterization of seasonal glacial seismicity from a single-station on-ice record at Holtedahlfonna, Svalbard Köhler, Andreas Maupin, Valerie Nuth, Christopher Van Pelt, Ward 2019 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385388 https://doi.org/10.1017/aog.2019.15 eng eng Uppsala universitet, Luft-, vatten- och landskapslära Department of Geosciences, University of Oslo, Post Box 1047, 0316 Oslo, Norway NORSAR, 2007 Kjeller, Norway Centre for Earth Evolution and Dynamics, Department of Geosciences, University of Oslo, Post Box 1028, 0316 Oslo, Norway Annals of Glaciology, 0260-3055, 2019, 60:79, s. 23-36 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385388 doi:10.1017/aog.2019.15 ISI:000480289300003 info:eu-repo/semantics/openAccess Physical Geography Naturgeografi Article in journal info:eu-repo/semantics/article text 2019 ftuppsalauniv https://doi.org/10.1017/aog.2019.15 2023-02-23T21:52:13Z Glacial seismicity provides important insights into glacier dynamic processes. We study the temporal distribution of cryogenic seismic signals (icequakes) at Holtedahlfonna, Svalbard, between April and August 2016 using a single three-component sensor. We investigate sources of observed icequakes using polarization analysis and waveform modeling. Processes responsible for five icequake categories are suggested, incorporating observations of previous studies into our interpretation. We infer that the most dominant icequake type is generated by surface crevasse opening through hydrofracturing. Secondly, bursts of high-frequency signals are presumably caused by repeated near-surface crevassing due to high strain rates during glacier fast-flow episodes. Furthermore, signals related to resonance in water-filled cracks, fracturing or settling events in dry firn or snow before the melt season, and processes at the glacier bed are observed. Amplitude of seismic background noise is clearly related to glacier runoff. We process ambient seismic noise to invert horizontal-to-vertical spectral ratios for a sub-surface seismic velocity model used to model icequake signals. Our study shows that a single seismic sensor provides useful information about seasonal ice dynamics in case deployment of a network is not feasible. Article in Journal/Newspaper Annals of Glaciology glacier Svalbard Uppsala University: Publications (DiVA) Holtedahlfonna ENVELOPE(13.730,13.730,79.011,79.011) Svalbard Annals of Glaciology 60 79 23 36 |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Physical Geography Naturgeografi |
spellingShingle |
Physical Geography Naturgeografi Köhler, Andreas Maupin, Valerie Nuth, Christopher Van Pelt, Ward Characterization of seasonal glacial seismicity from a single-station on-ice record at Holtedahlfonna, Svalbard |
topic_facet |
Physical Geography Naturgeografi |
description |
Glacial seismicity provides important insights into glacier dynamic processes. We study the temporal distribution of cryogenic seismic signals (icequakes) at Holtedahlfonna, Svalbard, between April and August 2016 using a single three-component sensor. We investigate sources of observed icequakes using polarization analysis and waveform modeling. Processes responsible for five icequake categories are suggested, incorporating observations of previous studies into our interpretation. We infer that the most dominant icequake type is generated by surface crevasse opening through hydrofracturing. Secondly, bursts of high-frequency signals are presumably caused by repeated near-surface crevassing due to high strain rates during glacier fast-flow episodes. Furthermore, signals related to resonance in water-filled cracks, fracturing or settling events in dry firn or snow before the melt season, and processes at the glacier bed are observed. Amplitude of seismic background noise is clearly related to glacier runoff. We process ambient seismic noise to invert horizontal-to-vertical spectral ratios for a sub-surface seismic velocity model used to model icequake signals. Our study shows that a single seismic sensor provides useful information about seasonal ice dynamics in case deployment of a network is not feasible. |
format |
Article in Journal/Newspaper |
author |
Köhler, Andreas Maupin, Valerie Nuth, Christopher Van Pelt, Ward |
author_facet |
Köhler, Andreas Maupin, Valerie Nuth, Christopher Van Pelt, Ward |
author_sort |
Köhler, Andreas |
title |
Characterization of seasonal glacial seismicity from a single-station on-ice record at Holtedahlfonna, Svalbard |
title_short |
Characterization of seasonal glacial seismicity from a single-station on-ice record at Holtedahlfonna, Svalbard |
title_full |
Characterization of seasonal glacial seismicity from a single-station on-ice record at Holtedahlfonna, Svalbard |
title_fullStr |
Characterization of seasonal glacial seismicity from a single-station on-ice record at Holtedahlfonna, Svalbard |
title_full_unstemmed |
Characterization of seasonal glacial seismicity from a single-station on-ice record at Holtedahlfonna, Svalbard |
title_sort |
characterization of seasonal glacial seismicity from a single-station on-ice record at holtedahlfonna, svalbard |
publisher |
Uppsala universitet, Luft-, vatten- och landskapslära |
publishDate |
2019 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385388 https://doi.org/10.1017/aog.2019.15 |
long_lat |
ENVELOPE(13.730,13.730,79.011,79.011) |
geographic |
Holtedahlfonna Svalbard |
geographic_facet |
Holtedahlfonna Svalbard |
genre |
Annals of Glaciology glacier Svalbard |
genre_facet |
Annals of Glaciology glacier Svalbard |
op_relation |
Annals of Glaciology, 0260-3055, 2019, 60:79, s. 23-36 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385388 doi:10.1017/aog.2019.15 ISI:000480289300003 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/aog.2019.15 |
container_title |
Annals of Glaciology |
container_volume |
60 |
container_issue |
79 |
container_start_page |
23 |
op_container_end_page |
36 |
_version_ |
1765999560259272704 |