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...
Main Author: | |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2010
|
Subjects: | |
Online Access: | https://www.zora.uzh.ch/id/eprint/40025/ https://www.zora.uzh.ch/id/eprint/40025/8/Hilbich_Time-lapse_Refraction_2010.pdf http://www.the-cryosphere.net/4/243/2010/ https://doi.org/10.5167/uzh-40025 https://doi.org/10.5194/tc-4-243-2010 |
id |
ftunivzuerich:oai:www.zora.uzh.ch:40025 |
---|---|
record_format |
openpolar |
spelling |
ftunivzuerich:oai:www.zora.uzh.ch:40025 2024-06-23T07:53:38+00:00 Time-lapse refraction seismic tomography for the detection of ground ice degradation Hilbich, C 2010 application/pdf https://www.zora.uzh.ch/id/eprint/40025/ https://www.zora.uzh.ch/id/eprint/40025/8/Hilbich_Time-lapse_Refraction_2010.pdf http://www.the-cryosphere.net/4/243/2010/ https://doi.org/10.5167/uzh-40025 https://doi.org/10.5194/tc-4-243-2010 eng eng Copernicus Publications https://www.zora.uzh.ch/id/eprint/40025/8/Hilbich_Time-lapse_Refraction_2010.pdf doi:10.5167/uzh-40025 doi:10.5194/tc-4-243-2010 urn:issn:1994-0416 info:eu-repo/semantics/openAccess Creative Commons: Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/ Hilbich, C (2010). Time-lapse refraction seismic tomography for the detection of ground ice degradation. The Cryosphere, 4(3):243-259. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article 2010 ftunivzuerich https://doi.org/10.5167/uzh-4002510.5194/tc-4-243-2010 2024-06-12T00:15:37Z 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 University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
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 Hilbich, C Time-lapse refraction seismic tomography for the detection of ground ice degradation |
topic_facet |
Institute of Geography 910 Geography & travel |
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://www.zora.uzh.ch/id/eprint/40025/ https://www.zora.uzh.ch/id/eprint/40025/8/Hilbich_Time-lapse_Refraction_2010.pdf http://www.the-cryosphere.net/4/243/2010/ https://doi.org/10.5167/uzh-40025 https://doi.org/10.5194/tc-4-243-2010 |
genre |
Ice permafrost The Cryosphere |
genre_facet |
Ice permafrost The Cryosphere |
op_source |
Hilbich, C (2010). Time-lapse refraction seismic tomography for the detection of ground ice degradation. The Cryosphere, 4(3):243-259. |
op_relation |
https://www.zora.uzh.ch/id/eprint/40025/8/Hilbich_Time-lapse_Refraction_2010.pdf doi:10.5167/uzh-40025 doi:10.5194/tc-4-243-2010 urn:issn:1994-0416 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons: Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.5167/uzh-4002510.5194/tc-4-243-2010 |
_version_ |
1802645386073997312 |