Permafrost mapping by audiofrequency magnetotellurics
The audiofrequency magnetotelluric (AMT) method has been used to study permafrost thickness near Tuktoyaktuk, N.W.T. in the Mackenzie Delta. In the frequency range of 10 Hz–10 kHz the permafrost behaves as a simple resistive layer over a conductive layer. This simple two-layer model can be inverted...
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Language: | English |
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Canadian Science Publishing
1978
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Online Access: | http://dx.doi.org/10.1139/e78-159 http://www.nrcresearchpress.com/doi/pdf/10.1139/e78-159 |
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crcansciencepubl:10.1139/e78-159 2023-12-17T10:33:15+01:00 Permafrost mapping by audiofrequency magnetotellurics Koziar, A. Strangway, D. W. 1978 http://dx.doi.org/10.1139/e78-159 http://www.nrcresearchpress.com/doi/pdf/10.1139/e78-159 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 15, issue 10, page 1539-1546 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1978 crcansciencepubl https://doi.org/10.1139/e78-159 2023-11-19T13:38:28Z The audiofrequency magnetotelluric (AMT) method has been used to study permafrost thickness near Tuktoyaktuk, N.W.T. in the Mackenzie Delta. In the frequency range of 10 Hz–10 kHz the permafrost behaves as a simple resistive layer over a conductive layer. This simple two-layer model can be inverted by asymptotic models to give a unique value for the thickness of the highly resistive frozen layer. In areas of simple layering, these results correlate well with drilling. In areas of sharp lateral variations in resistivity, depths tend to be underestimated. Unlike other electrical methods, AMT is not hampered by the presence of a surface melt layer in the summer if the conductivity–thickness product of this 'active layer' is less than about 0.03 mho (0.03 S). Article in Journal/Newspaper Mackenzie Delta permafrost Canadian Science Publishing (via Crossref) Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Tuktoyaktuk ENVELOPE(-133.006,-133.006,69.425,69.425) Canadian Journal of Earth Sciences 15 10 1539 1546 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Koziar, A. Strangway, D. W. Permafrost mapping by audiofrequency magnetotellurics |
topic_facet |
General Earth and Planetary Sciences |
description |
The audiofrequency magnetotelluric (AMT) method has been used to study permafrost thickness near Tuktoyaktuk, N.W.T. in the Mackenzie Delta. In the frequency range of 10 Hz–10 kHz the permafrost behaves as a simple resistive layer over a conductive layer. This simple two-layer model can be inverted by asymptotic models to give a unique value for the thickness of the highly resistive frozen layer. In areas of simple layering, these results correlate well with drilling. In areas of sharp lateral variations in resistivity, depths tend to be underestimated. Unlike other electrical methods, AMT is not hampered by the presence of a surface melt layer in the summer if the conductivity–thickness product of this 'active layer' is less than about 0.03 mho (0.03 S). |
format |
Article in Journal/Newspaper |
author |
Koziar, A. Strangway, D. W. |
author_facet |
Koziar, A. Strangway, D. W. |
author_sort |
Koziar, A. |
title |
Permafrost mapping by audiofrequency magnetotellurics |
title_short |
Permafrost mapping by audiofrequency magnetotellurics |
title_full |
Permafrost mapping by audiofrequency magnetotellurics |
title_fullStr |
Permafrost mapping by audiofrequency magnetotellurics |
title_full_unstemmed |
Permafrost mapping by audiofrequency magnetotellurics |
title_sort |
permafrost mapping by audiofrequency magnetotellurics |
publisher |
Canadian Science Publishing |
publishDate |
1978 |
url |
http://dx.doi.org/10.1139/e78-159 http://www.nrcresearchpress.com/doi/pdf/10.1139/e78-159 |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) ENVELOPE(-133.006,-133.006,69.425,69.425) |
geographic |
Mackenzie Delta Tuktoyaktuk |
geographic_facet |
Mackenzie Delta Tuktoyaktuk |
genre |
Mackenzie Delta permafrost |
genre_facet |
Mackenzie Delta permafrost |
op_source |
Canadian Journal of Earth Sciences volume 15, issue 10, page 1539-1546 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e78-159 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
15 |
container_issue |
10 |
container_start_page |
1539 |
op_container_end_page |
1546 |
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1785587167939002368 |