Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica

Detalhes bibliográficos
Autor(a) principal: Correia, Antonio
Data de Publicação: 2015
Outros Autores: Vieira, Gonçalo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/17807
https://doi.org/10.3997/2214-4609.201414156
Resumo: 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.
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spelling Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime AntarcticaDeception 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.European Association of Exploration Geophysicists2016-03-08T17:02:49Z2016-03-082015-10-05T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/17807http://hdl.handle.net/10174/17807https://doi.org/10.3997/2214-4609.201414156engEarthdoccorreia@uevora.ptndCorreia, AntonioVieira, Gonçaloinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:05:24Zoai:dspace.uevora.pt:10174/17807Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:09:47.649912Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica
title Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica
spellingShingle Results of geoelectrical surveys in the area of Crater 70, Deception Island, Maritime Antarctica
Correia, Antonio
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
author Correia, Antonio
author_facet Correia, Antonio
Vieira, Gonçalo
author_role author
author2 Vieira, Gonçalo
author2_role author
dc.contributor.author.fl_str_mv Correia, Antonio
Vieira, Gonçalo
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.
publishDate 2015
dc.date.none.fl_str_mv 2015-10-05T00:00:00Z
2016-03-08T17:02:49Z
2016-03-08
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/17807
http://hdl.handle.net/10174/17807
https://doi.org/10.3997/2214-4609.201414156
url http://hdl.handle.net/10174/17807
https://doi.org/10.3997/2214-4609.201414156
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