A GPR survey on degraded permafrost at Mesón San Juan, Mendonza, Argentina
This work presents some geophysical results obtained at Mesón San Juan located in the Central Andes (6,012 m, 33°30' Sand 69°49' W), on the border of Argentina and Chile. The permafrost plateau (4,400 m) situated at the loot of the glacier is limited by recent moraines produced by cryoge...
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ftjscielo:oai:scielo:S0102-261X2008000400011 2023-05-15T17:55:35+02:00 A GPR survey on degraded permafrost at Mesón San Juan, Mendonza, Argentina Travassos,Jandyr de Menezes Stael,Giovanni Chaves Liaudat,Dario Trombotto 2008-12-01 text/html http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2008000400011 en eng Sociedade Brasileira de Geofísica Revista Brasileira de Geofísica v.26 n.4 2008 degraded permafrost GPR imaging global warming Andes journal article 2008 ftjscielo 2015-10-26T19:37:53Z This work presents some geophysical results obtained at Mesón San Juan located in the Central Andes (6,012 m, 33°30' Sand 69°49' W), on the border of Argentina and Chile. The permafrost plateau (4,400 m) situated at the loot of the glacier is limited by recent moraines produced by cryogenic phenomena. The geophysical results revealed lateral differences in the dielectric characteristics of the subsurface due to varying water contents, allowing a zoning of the permafrost structure. We have compared the electrical permittivities in a semi-quantitative way through a trial-and-error migration procedure, taking advantage of the clutter present in the permafrost as seen in the fixed-offset data. In this way we were able to recognize a confined zone of relatively low phase velocity indicating higher porosity and water content. We interpret that zone as degraded permafrost , probably a result of the impact of global warming on the Andean cryolithozone. That zone is likely a discharge channel linking a suprapermafrost to a subpermafrost aquifer, part of a laterally discontinuous near surface system not mapped in this work. Article in Journal/Newspaper permafrost SciELO Brazil (Scientific Electronic Library Online) Argentina San Juan |
institution |
Open Polar |
collection |
SciELO Brazil (Scientific Electronic Library Online) |
op_collection_id |
ftjscielo |
language |
English |
topic |
degraded permafrost GPR imaging global warming Andes |
spellingShingle |
degraded permafrost GPR imaging global warming Andes Travassos,Jandyr de Menezes Stael,Giovanni Chaves Liaudat,Dario Trombotto A GPR survey on degraded permafrost at Mesón San Juan, Mendonza, Argentina |
topic_facet |
degraded permafrost GPR imaging global warming Andes |
description |
This work presents some geophysical results obtained at Mesón San Juan located in the Central Andes (6,012 m, 33°30' Sand 69°49' W), on the border of Argentina and Chile. The permafrost plateau (4,400 m) situated at the loot of the glacier is limited by recent moraines produced by cryogenic phenomena. The geophysical results revealed lateral differences in the dielectric characteristics of the subsurface due to varying water contents, allowing a zoning of the permafrost structure. We have compared the electrical permittivities in a semi-quantitative way through a trial-and-error migration procedure, taking advantage of the clutter present in the permafrost as seen in the fixed-offset data. In this way we were able to recognize a confined zone of relatively low phase velocity indicating higher porosity and water content. We interpret that zone as degraded permafrost , probably a result of the impact of global warming on the Andean cryolithozone. That zone is likely a discharge channel linking a suprapermafrost to a subpermafrost aquifer, part of a laterally discontinuous near surface system not mapped in this work. |
format |
Article in Journal/Newspaper |
author |
Travassos,Jandyr de Menezes Stael,Giovanni Chaves Liaudat,Dario Trombotto |
author_facet |
Travassos,Jandyr de Menezes Stael,Giovanni Chaves Liaudat,Dario Trombotto |
author_sort |
Travassos,Jandyr de Menezes |
title |
A GPR survey on degraded permafrost at Mesón San Juan, Mendonza, Argentina |
title_short |
A GPR survey on degraded permafrost at Mesón San Juan, Mendonza, Argentina |
title_full |
A GPR survey on degraded permafrost at Mesón San Juan, Mendonza, Argentina |
title_fullStr |
A GPR survey on degraded permafrost at Mesón San Juan, Mendonza, Argentina |
title_full_unstemmed |
A GPR survey on degraded permafrost at Mesón San Juan, Mendonza, Argentina |
title_sort |
gpr survey on degraded permafrost at mesón san juan, mendonza, argentina |
publisher |
Sociedade Brasileira de Geofísica |
publishDate |
2008 |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2008000400011 |
geographic |
Argentina San Juan |
geographic_facet |
Argentina San Juan |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Revista Brasileira de Geofísica v.26 n.4 2008 |
_version_ |
1766163545556254720 |