Ambient noise correlation on the Amery Ice Shelf, East Antarctica
The structure of ice shelves is important for modelling the dynamics of ice flux from the continents to the oceans. While other, more traditional techniques provide many constraints, passive imaging with seismic noise is a complementary tool for studying and monitoring ice shelves. As a proof of con...
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fthighwire:oai:open-archive.highwire.org:gji:196/3/1796 2023-05-15T13:22:01+02:00 Ambient noise correlation on the Amery Ice Shelf, East Antarctica Zhan, Zhongwen Tsai, Victor C. Jackson, Jennifer M. Helmberger, Don 2014-03-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/196/3/1796 https://doi.org/10.1093/gji/ggt488 en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/196/3/1796 http://dx.doi.org/10.1093/gji/ggt488 Copyright (C) 2014, Oxford University Press Seismology TEXT 2014 fthighwire https://doi.org/10.1093/gji/ggt488 2018-04-07T06:24:42Z The structure of ice shelves is important for modelling the dynamics of ice flux from the continents to the oceans. While other, more traditional techniques provide many constraints, passive imaging with seismic noise is a complementary tool for studying and monitoring ice shelves. As a proof of concept, here we study noise cross-correlations and autocorrelations on the Amery Ice Shelf, East Antarctica. We find that the noise field on the ice shelf is dominated by energy trapped in a low-velocity waveguide caused by the water layer below the ice. Within this interpretation, we explain spectral ratios of the noise cross-correlations as P -wave resonances in the water layer, and obtain an independent estimate of the water-column thickness, consistent with other measurements. For stations with noise dominated by elastic waves, noise autocorrelations also provide similar results. High-frequency noise correlations also require a 50-m firn layer near the surface with P -wave velocity as low as 1 km s−1. Our study may also provide insight for future planetary missions that involve seismic exploration of icy satellites such as Titan and Europa. Text Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Ice Shelves HighWire Press (Stanford University) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) East Antarctica Titan ENVELOPE(-68.733,-68.733,-72.083,-72.083) Geophysical Journal International 196 3 1796 1802 |
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Open Polar |
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HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Seismology |
spellingShingle |
Seismology Zhan, Zhongwen Tsai, Victor C. Jackson, Jennifer M. Helmberger, Don Ambient noise correlation on the Amery Ice Shelf, East Antarctica |
topic_facet |
Seismology |
description |
The structure of ice shelves is important for modelling the dynamics of ice flux from the continents to the oceans. While other, more traditional techniques provide many constraints, passive imaging with seismic noise is a complementary tool for studying and monitoring ice shelves. As a proof of concept, here we study noise cross-correlations and autocorrelations on the Amery Ice Shelf, East Antarctica. We find that the noise field on the ice shelf is dominated by energy trapped in a low-velocity waveguide caused by the water layer below the ice. Within this interpretation, we explain spectral ratios of the noise cross-correlations as P -wave resonances in the water layer, and obtain an independent estimate of the water-column thickness, consistent with other measurements. For stations with noise dominated by elastic waves, noise autocorrelations also provide similar results. High-frequency noise correlations also require a 50-m firn layer near the surface with P -wave velocity as low as 1 km s−1. Our study may also provide insight for future planetary missions that involve seismic exploration of icy satellites such as Titan and Europa. |
format |
Text |
author |
Zhan, Zhongwen Tsai, Victor C. Jackson, Jennifer M. Helmberger, Don |
author_facet |
Zhan, Zhongwen Tsai, Victor C. Jackson, Jennifer M. Helmberger, Don |
author_sort |
Zhan, Zhongwen |
title |
Ambient noise correlation on the Amery Ice Shelf, East Antarctica |
title_short |
Ambient noise correlation on the Amery Ice Shelf, East Antarctica |
title_full |
Ambient noise correlation on the Amery Ice Shelf, East Antarctica |
title_fullStr |
Ambient noise correlation on the Amery Ice Shelf, East Antarctica |
title_full_unstemmed |
Ambient noise correlation on the Amery Ice Shelf, East Antarctica |
title_sort |
ambient noise correlation on the amery ice shelf, east antarctica |
publisher |
Oxford University Press |
publishDate |
2014 |
url |
http://gji.oxfordjournals.org/cgi/content/short/196/3/1796 https://doi.org/10.1093/gji/ggt488 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(-68.733,-68.733,-72.083,-72.083) |
geographic |
Amery Amery Ice Shelf East Antarctica Titan |
geographic_facet |
Amery Amery Ice Shelf East Antarctica Titan |
genre |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Ice Shelves |
genre_facet |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Ice Shelves |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/196/3/1796 http://dx.doi.org/10.1093/gji/ggt488 |
op_rights |
Copyright (C) 2014, Oxford University Press |
op_doi |
https://doi.org/10.1093/gji/ggt488 |
container_title |
Geophysical Journal International |
container_volume |
196 |
container_issue |
3 |
container_start_page |
1796 |
op_container_end_page |
1802 |
_version_ |
1766362831234531328 |