Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica
Deception Island is horse-shoe shaped stratovolcano with 15 km diameter and a large caldera that opens towards the southeast, forming a bay about 7 km wide. The maximum altitude is at Mount Pond (539 m a.s.l.). About 57% of the island area is covered by glaciers. In geological terms Deception Island...
Published in: | Proceedings, 8th Congress of the Balkan Geophysical Society |
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European Association of Exploration Geophysicists
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Online Access: | http://hdl.handle.net/10174/17807 https://doi.org/10.3997/2214-4609.201414156 |
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ftunivevora:oai:dspace.uevora.pt:10174/17807 2023-09-05T13:15:10+02:00 Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica Correia, Antonio Vieira, Gonçalo 2015-10-05 http://hdl.handle.net/10174/17807 https://doi.org/10.3997/2214-4609.201414156 eng eng European Association of Exploration Geophysicists http://hdl.handle.net/10174/17807 Earthdoc correia@uevora.pt nd doi:10.3997/2214-4609.201414156 openAccess article 2015 ftunivevora https://doi.org/10.3997/2214-4609.201414156 2023-08-14T17:38:49Z Deception Island is horse-shoe shaped stratovolcano with 15 km diameter and a large caldera that opens towards the southeast, forming a bay about 7 km wide. The maximum altitude is at Mount Pond (539 m a.s.l.). About 57% of the island area is covered by glaciers. In geological terms Deception Island is composed of volcano-sedimentary deposits, including pyroclastic flows and deposits, strombolian scoriae and lava, volcanic and hypo-volcanic indurated ashes, and phreatomagmatic deposits. Recent eruptions took place in the interior of the island in 1967, 1969, and 1970. Permafrost is widespread in the island but its characteristics are still poorly studied. In this study we present geoelectrical data collected in the Crater 70 area of Deception Island which was formed during the eruptions of 1970. The study area is located in the southern slope of a volcanic cone and the objective of the geoelectrical survey was to determine if there were any permafrost aggradation after the eruptive event and to assess the thickness of the frozen body. Two electrical resistivity tomography (ERT) profiles and a vertical electrical sounding (VES) were done (Fig. 1). Geoelectrical methods are particularly well adapted to study the spatial distribution of permafrost because of its high electrical resistivities in comparison with the electrical resistivities of soil and rocks with water and above 0 oC. Article in Journal/Newspaper Antarc* Antarctica Deception Island permafrost Repositório Científico da Universidade de Évora Deception Island ENVELOPE(-60.633,-60.633,-62.950,-62.950) Mount Pond ENVELOPE(-58.589,-58.589,-62.167,-62.167) Proceedings, 8th Congress of the Balkan Geophysical Society |
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Open Polar |
collection |
Repositório Científico da Universidade de Évora |
op_collection_id |
ftunivevora |
language |
English |
description |
Deception Island is horse-shoe shaped stratovolcano with 15 km diameter and a large caldera that opens towards the southeast, forming a bay about 7 km wide. The maximum altitude is at Mount Pond (539 m a.s.l.). About 57% of the island area is covered by glaciers. In geological terms Deception Island is composed of volcano-sedimentary deposits, including pyroclastic flows and deposits, strombolian scoriae and lava, volcanic and hypo-volcanic indurated ashes, and phreatomagmatic deposits. Recent eruptions took place in the interior of the island in 1967, 1969, and 1970. Permafrost is widespread in the island but its characteristics are still poorly studied. In this study we present geoelectrical data collected in the Crater 70 area of Deception Island which was formed during the eruptions of 1970. The study area is located in the southern slope of a volcanic cone and the objective of the geoelectrical survey was to determine if there were any permafrost aggradation after the eruptive event and to assess the thickness of the frozen body. Two electrical resistivity tomography (ERT) profiles and a vertical electrical sounding (VES) were done (Fig. 1). Geoelectrical methods are particularly well adapted to study the spatial distribution of permafrost because of its high electrical resistivities in comparison with the electrical resistivities of soil and rocks with water and above 0 oC. |
format |
Article in Journal/Newspaper |
author |
Correia, Antonio Vieira, Gonçalo |
spellingShingle |
Correia, Antonio Vieira, Gonçalo Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica |
author_facet |
Correia, Antonio Vieira, Gonçalo |
author_sort |
Correia, Antonio |
title |
Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica |
title_short |
Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica |
title_full |
Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica |
title_fullStr |
Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica |
title_full_unstemmed |
Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica |
title_sort |
results of geoelectrical surveys in the area of crater 70, deception island, maritime antarctica |
publisher |
European Association of Exploration Geophysicists |
publishDate |
2015 |
url |
http://hdl.handle.net/10174/17807 https://doi.org/10.3997/2214-4609.201414156 |
long_lat |
ENVELOPE(-60.633,-60.633,-62.950,-62.950) ENVELOPE(-58.589,-58.589,-62.167,-62.167) |
geographic |
Deception Island Mount Pond |
geographic_facet |
Deception Island Mount Pond |
genre |
Antarc* Antarctica Deception Island permafrost |
genre_facet |
Antarc* Antarctica Deception Island permafrost |
op_relation |
http://hdl.handle.net/10174/17807 Earthdoc correia@uevora.pt nd doi:10.3997/2214-4609.201414156 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.3997/2214-4609.201414156 |
container_title |
Proceedings, 8th Congress of the Balkan Geophysical Society |
_version_ |
1776196988230959104 |