GIS based analysis, processed sub bottom profiler, and composite grid and backscatter mosaics around Tristan da Cunha
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| Main Authors: | , , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2019
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| _version_ | 1867170474604101632 |
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| author | Geissler, Wolfram H Wintersteller, Paul Strack, Anne Kammann, Janina Jegen, Marion Maia, Marcia Schloemer, Antje Jokat, Wilfried |
| author_facet | Geissler, Wolfram H Wintersteller, Paul Strack, Anne Kammann, Janina Jegen, Marion Maia, Marcia Schloemer, Antje Jokat, Wilfried |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Tristan da Cunha is assumed to be the youngest subaerial expression of the Walvis Ridge hot spot. Based on new hydroacoustic data, we propose that the most recent hot spot volcanic activity occurs west of the island. We surveyed relatively young intraplate volcanic fields and scattered, probably monogenetic, submarine volcanoes with multibeam echosounders and sub-bottom profilers. Structural and zonal GIS analysis of bathymetric and backscatter results, based on habitat mapping algorithms to discriminate seafloor features, revealed numerous previously-unknown volcanic structures. South of Tristan da Cunha, we discovered two large seamounts. One of them, Isolde Seamount, is most likely the source of a 2004 submarine eruption known from a pumice stranding event and seismological analysis. An oceanic core complex, identified at the intersection of the Tristan da Cunha Transform and Fracture Zone System with the Mid-Atlantic Ridge, might indicate reduced magma supply and, therefore, weak plume-ridge interaction at present times. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_906154 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | GIS based analysis, processed sub bottom profiler, and composite grid and backscatter mosaics around Tristan da Cunha Geissler, Wolfram H Wintersteller, Paul Strack, Anne Kammann, Janina Jegen, Marion Maia, Marcia Schloemer, Antje Jokat, Wilfried Center for Marine Environmental Sciences; MARUM Tristan da Cunha is assumed to be the youngest subaerial expression of the Walvis Ridge hot spot. Based on new hydroacoustic data, we propose that the most recent hot spot volcanic activity occurs west of the island. We surveyed relatively young intraplate volcanic fields and scattered, probably monogenetic, submarine volcanoes with multibeam echosounders and sub-bottom profilers. Structural and zonal GIS analysis of bathymetric and backscatter results, based on habitat mapping algorithms to discriminate seafloor features, revealed numerous previously-unknown volcanic structures. South of Tristan da Cunha, we discovered two large seamounts. One of them, Isolde Seamount, is most likely the source of a 2004 submarine eruption known from a pumice stranding event and seismological analysis. An oceanic core complex, identified at the intersection of the Tristan da Cunha Transform and Fracture Zone System with the Mid-Atlantic Ridge, might indicate reduced magma supply and, therefore, weak plume-ridge interaction at present times. |
| title | GIS based analysis, processed sub bottom profiler, and composite grid and backscatter mosaics around Tristan da Cunha |
| topic | Center for Marine Environmental Sciences; MARUM |
| url | https://doi.org/10.1594/PANGAEA.906154 |