Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica
We present seismic measurements of the firn column at Korff Ice Rise, West Antarctica, including measurements of compressional-wave velocity and attenuation. We describe a modified spectral-ratio method of measuring the seismic quality factor (Q) based on analysis of diving waves, which, combined wi...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press
|
Subjects: | |
Online Access: | https://doi.org/10.1017/jog.2023.82 https://doaj.org/article/efb2fcfefbc94316bcd2e42cfea08e73 |
id |
ftdoajarticles:oai:doaj.org/article:efb2fcfefbc94316bcd2e42cfea08e73 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:efb2fcfefbc94316bcd2e42cfea08e73 2023-11-12T04:05:58+01:00 Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica Ronan S. Agnew Roger A. Clark Adam D. Booth Alex M. Brisbourne Andrew M. Smith https://doi.org/10.1017/jog.2023.82 https://doaj.org/article/efb2fcfefbc94316bcd2e42cfea08e73 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143023000825/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.82 0022-1430 1727-5652 https://doaj.org/article/efb2fcfefbc94316bcd2e42cfea08e73 Journal of Glaciology, Pp 1-12 Glacier geophysics glaciological instruments and methods polar firn seismics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article ftdoajarticles https://doi.org/10.1017/jog.2023.82 2023-10-29T00:38:27Z We present seismic measurements of the firn column at Korff Ice Rise, West Antarctica, including measurements of compressional-wave velocity and attenuation. We describe a modified spectral-ratio method of measuring the seismic quality factor (Q) based on analysis of diving waves, which, combined with a stochastic method of error propagation, enables us to characterise the attenuative structure of firn in greater detail than has previously been possible. Q increases from 56 ± 23 in the uppermost 12 m to 570 ± 450 between 55 and 77 m depth. We corroborate our method with consistent measurements obtained via primary reflection, multiple, source ghost, and critically refracted waves. Using the primary reflection and its ghost, we find Q = 53 ± 20 in the uppermost 20 m of firn. From the critical refraction, we find Q = 640 ± 400 at 90 m depth. Our method aids the understanding of the seismic structure of firn and benefits characterisation of deeper glaciological targets, providing an alternative means of correcting seismic reflection amplitudes in cases where conventional methods of Q correction may be impossible. Article in Journal/Newspaper Antarc* Antarctica Journal of Glaciology West Antarctica Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 1 12 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Glacier geophysics glaciological instruments and methods polar firn seismics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Glacier geophysics glaciological instruments and methods polar firn seismics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Ronan S. Agnew Roger A. Clark Adam D. Booth Alex M. Brisbourne Andrew M. Smith Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica |
topic_facet |
Glacier geophysics glaciological instruments and methods polar firn seismics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
We present seismic measurements of the firn column at Korff Ice Rise, West Antarctica, including measurements of compressional-wave velocity and attenuation. We describe a modified spectral-ratio method of measuring the seismic quality factor (Q) based on analysis of diving waves, which, combined with a stochastic method of error propagation, enables us to characterise the attenuative structure of firn in greater detail than has previously been possible. Q increases from 56 ± 23 in the uppermost 12 m to 570 ± 450 between 55 and 77 m depth. We corroborate our method with consistent measurements obtained via primary reflection, multiple, source ghost, and critically refracted waves. Using the primary reflection and its ghost, we find Q = 53 ± 20 in the uppermost 20 m of firn. From the critical refraction, we find Q = 640 ± 400 at 90 m depth. Our method aids the understanding of the seismic structure of firn and benefits characterisation of deeper glaciological targets, providing an alternative means of correcting seismic reflection amplitudes in cases where conventional methods of Q correction may be impossible. |
format |
Article in Journal/Newspaper |
author |
Ronan S. Agnew Roger A. Clark Adam D. Booth Alex M. Brisbourne Andrew M. Smith |
author_facet |
Ronan S. Agnew Roger A. Clark Adam D. Booth Alex M. Brisbourne Andrew M. Smith |
author_sort |
Ronan S. Agnew |
title |
Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica |
title_short |
Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica |
title_full |
Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica |
title_fullStr |
Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica |
title_full_unstemmed |
Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica |
title_sort |
measuring seismic attenuation in polar firn: method and application to korff ice rise, west antarctica |
publisher |
Cambridge University Press |
url |
https://doi.org/10.1017/jog.2023.82 https://doaj.org/article/efb2fcfefbc94316bcd2e42cfea08e73 |
genre |
Antarc* Antarctica Journal of Glaciology West Antarctica |
genre_facet |
Antarc* Antarctica Journal of Glaciology West Antarctica |
op_source |
Journal of Glaciology, Pp 1-12 |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143023000825/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.82 0022-1430 1727-5652 https://doaj.org/article/efb2fcfefbc94316bcd2e42cfea08e73 |
op_doi |
https://doi.org/10.1017/jog.2023.82 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
12 |
_version_ |
1782342145197211648 |