Time-lapse refraction seismic tomography for the detection of ground ice degradation
The ice content of the subsurface is a major factor controlling the natural hazard potential of permafrost degradation in alpine terrain. Monitoring of changes in ice content is therefore similarly important as temperature monitoring in mountain permafrost. Although electrical resistivity tomography...
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Copernicus Publications
2010
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00028712 2023-05-15T16:37:06+02:00 Time-lapse refraction seismic tomography for the detection of ground ice degradation Hilbich, C. 2010-07 electronic https://doi.org/10.5194/tc-4-243-2010 https://noa.gwlb.de/receive/cop_mods_00028712 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00028667/tc-4-243-2010.pdf https://tc.copernicus.org/articles/4/243/2010/tc-4-243-2010.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-4-243-2010 https://noa.gwlb.de/receive/cop_mods_00028712 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00028667/tc-4-243-2010.pdf https://tc.copernicus.org/articles/4/243/2010/tc-4-243-2010.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2010 ftnonlinearchiv https://doi.org/10.5194/tc-4-243-2010 2022-02-08T22:48:03Z The ice content of the subsurface is a major factor controlling the natural hazard potential of permafrost degradation in alpine terrain. Monitoring of changes in ice content is therefore similarly important as temperature monitoring in mountain permafrost. Although electrical resistivity tomography monitoring (ERTM) proved to be a valuable tool for the observation of ice degradation, results are often ambiguous or contaminated by inversion artefacts. In theory, the sensitivity of P-wave velocity of seismic waves to phase changes between unfrozen water and ice is similar to the sensitivity of electric resistivity. Provided that the general conditions (lithology, stratigraphy, state of weathering, pore space) remain unchanged over the observation period, temporal changes in the observed travel times of repeated seismic measurements should indicate changes in the ice and water content within the pores and fractures of the subsurface material. In this paper, a time-lapse refraction seismic tomography (TLST) approach is applied as an independent method to ERTM at two test sites in the Swiss Alps. The approach was tested and validated based on a) the comparison of time-lapse seismograms and analysis of reproducibility of the seismic signal, b) the analysis of time-lapse travel time curves with respect to shifts in travel times and changes in P-wave velocities, and c) the comparison of inverted tomograms including the quantification of velocity changes. Results show a high potential of the TLST approach concerning the detection of altered subsurface conditions caused by freezing and thawing processes. For velocity changes on the order of 3000 m/s even an unambiguous identification of significant ice loss is possible. Article in Journal/Newspaper Ice permafrost The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 4 3 243 259 |
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article Verlagsveröffentlichung Hilbich, C. Time-lapse refraction seismic tomography for the detection of ground ice degradation |
topic_facet |
article Verlagsveröffentlichung |
description |
The ice content of the subsurface is a major factor controlling the natural hazard potential of permafrost degradation in alpine terrain. Monitoring of changes in ice content is therefore similarly important as temperature monitoring in mountain permafrost. Although electrical resistivity tomography monitoring (ERTM) proved to be a valuable tool for the observation of ice degradation, results are often ambiguous or contaminated by inversion artefacts. In theory, the sensitivity of P-wave velocity of seismic waves to phase changes between unfrozen water and ice is similar to the sensitivity of electric resistivity. Provided that the general conditions (lithology, stratigraphy, state of weathering, pore space) remain unchanged over the observation period, temporal changes in the observed travel times of repeated seismic measurements should indicate changes in the ice and water content within the pores and fractures of the subsurface material. In this paper, a time-lapse refraction seismic tomography (TLST) approach is applied as an independent method to ERTM at two test sites in the Swiss Alps. The approach was tested and validated based on a) the comparison of time-lapse seismograms and analysis of reproducibility of the seismic signal, b) the analysis of time-lapse travel time curves with respect to shifts in travel times and changes in P-wave velocities, and c) the comparison of inverted tomograms including the quantification of velocity changes. Results show a high potential of the TLST approach concerning the detection of altered subsurface conditions caused by freezing and thawing processes. For velocity changes on the order of 3000 m/s even an unambiguous identification of significant ice loss is possible. |
format |
Article in Journal/Newspaper |
author |
Hilbich, C. |
author_facet |
Hilbich, C. |
author_sort |
Hilbich, C. |
title |
Time-lapse refraction seismic tomography for the detection of ground ice degradation |
title_short |
Time-lapse refraction seismic tomography for the detection of ground ice degradation |
title_full |
Time-lapse refraction seismic tomography for the detection of ground ice degradation |
title_fullStr |
Time-lapse refraction seismic tomography for the detection of ground ice degradation |
title_full_unstemmed |
Time-lapse refraction seismic tomography for the detection of ground ice degradation |
title_sort |
time-lapse refraction seismic tomography for the detection of ground ice degradation |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/tc-4-243-2010 https://noa.gwlb.de/receive/cop_mods_00028712 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00028667/tc-4-243-2010.pdf https://tc.copernicus.org/articles/4/243/2010/tc-4-243-2010.pdf |
genre |
Ice permafrost The Cryosphere |
genre_facet |
Ice permafrost The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-4-243-2010 https://noa.gwlb.de/receive/cop_mods_00028712 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00028667/tc-4-243-2010.pdf https://tc.copernicus.org/articles/4/243/2010/tc-4-243-2010.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-4-243-2010 |
container_title |
The Cryosphere |
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4 |
container_issue |
3 |
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243 |
op_container_end_page |
259 |
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1766027406414446592 |