Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence
Earthquake locations along the southern Mid-Atlantic Ridge have large uncertainties due to the sparse distribution of permanent seismological stations in and around the South Atlantic Ocean. Most of the earthquakes are associated with plate tectonic processes related to the formation of new oceanic...
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ftawi:oai:epic.awi.de:46647 2024-09-09T20:08:46+00:00 Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence Schloemer, Antje Geissler, Wolfram Jokat, Wilfried Jegen, Marion 2017-12-29 https://epic.awi.de/id/eprint/46647/ https://hdl.handle.net/10013/epic.4d365ffb-4402-4113-a7b8-11113aee8dc3 unknown Schloemer, A. , Geissler, W. orcid:0000-0001-6807-555X , Jokat, W. orcid:0000-0002-7793-5854 and Jegen, M. (2017) Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence , Journal of Geophysical Research: Solid Earth, 122 (12), 10,427-10,439 . doi:10.1002/2017JB015017 <https://doi.org/10.1002/2017JB015017> , hdl:10013/epic.4d365ffb-4402-4113-a7b8-11113aee8dc3 EPIC3Journal of Geophysical Research: Solid Earth, 122(12), pp. 10,427-10,439 Article isiRev 2017 ftawi https://doi.org/10.1002/2017JB015017 2024-06-24T04:19:47Z Earthquake locations along the southern Mid-Atlantic Ridge have large uncertainties due to the sparse distribution of permanent seismological stations in and around the South Atlantic Ocean. Most of the earthquakes are associated with plate tectonic processes related to the formation of new oceanic lithosphere, as they are located close to the ridge axis or in the immediate vicinity of transform faults. A local seismological network of ocean-bottom seismometers and land stations on and around the archipelago of Tristan da Cunha allowed for the first time a local earthquake survey for 1 year. We relate intraplate seismicity within the African oceanic plate segment north of the island partly to extensional stresses induced by a bordering large transform fault and to the existence of the Tristan mantle plume. The temporal propagation of earthquakes within the segment reflects the prevailing stress field. The strong extensional stresses in addition with the plume weaken the lithosphere and might hint at an incipient ridge jump. An apparently aseismic zone coincides with the proposed location of the Tristan conduit in the upper mantle southwest of the islands. The margins of this zone describe the transition between the ductile and the surrounding brittle regime. Moreover, we observe seismicity close to the islands of Tristan da Cunha and nearby seamounts, which we relate to ongoing tectono-magmatic activity. Article in Journal/Newspaper South Atlantic Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Mid-Atlantic Ridge Tristan ENVELOPE(140.900,140.900,-66.735,-66.735) Journal of Geophysical Research: Solid Earth 122 12 10,427 10,439 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Earthquake locations along the southern Mid-Atlantic Ridge have large uncertainties due to the sparse distribution of permanent seismological stations in and around the South Atlantic Ocean. Most of the earthquakes are associated with plate tectonic processes related to the formation of new oceanic lithosphere, as they are located close to the ridge axis or in the immediate vicinity of transform faults. A local seismological network of ocean-bottom seismometers and land stations on and around the archipelago of Tristan da Cunha allowed for the first time a local earthquake survey for 1 year. We relate intraplate seismicity within the African oceanic plate segment north of the island partly to extensional stresses induced by a bordering large transform fault and to the existence of the Tristan mantle plume. The temporal propagation of earthquakes within the segment reflects the prevailing stress field. The strong extensional stresses in addition with the plume weaken the lithosphere and might hint at an incipient ridge jump. An apparently aseismic zone coincides with the proposed location of the Tristan conduit in the upper mantle southwest of the islands. The margins of this zone describe the transition between the ductile and the surrounding brittle regime. Moreover, we observe seismicity close to the islands of Tristan da Cunha and nearby seamounts, which we relate to ongoing tectono-magmatic activity. |
format |
Article in Journal/Newspaper |
author |
Schloemer, Antje Geissler, Wolfram Jokat, Wilfried Jegen, Marion |
spellingShingle |
Schloemer, Antje Geissler, Wolfram Jokat, Wilfried Jegen, Marion Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence |
author_facet |
Schloemer, Antje Geissler, Wolfram Jokat, Wilfried Jegen, Marion |
author_sort |
Schloemer, Antje |
title |
Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence |
title_short |
Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence |
title_full |
Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence |
title_fullStr |
Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence |
title_full_unstemmed |
Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence |
title_sort |
seismicity in the vicinity of the tristan da cunha hotspot: particular plate tectonics and mantle plume presence |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/46647/ https://hdl.handle.net/10013/epic.4d365ffb-4402-4113-a7b8-11113aee8dc3 |
long_lat |
ENVELOPE(140.900,140.900,-66.735,-66.735) |
geographic |
Mid-Atlantic Ridge Tristan |
geographic_facet |
Mid-Atlantic Ridge Tristan |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
EPIC3Journal of Geophysical Research: Solid Earth, 122(12), pp. 10,427-10,439 |
op_relation |
Schloemer, A. , Geissler, W. orcid:0000-0001-6807-555X , Jokat, W. orcid:0000-0002-7793-5854 and Jegen, M. (2017) Seismicity in the vicinity of the Tristan da Cunha hotspot: Particular plate tectonics and mantle plume presence , Journal of Geophysical Research: Solid Earth, 122 (12), 10,427-10,439 . doi:10.1002/2017JB015017 <https://doi.org/10.1002/2017JB015017> , hdl:10013/epic.4d365ffb-4402-4113-a7b8-11113aee8dc3 |
op_doi |
https://doi.org/10.1002/2017JB015017 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
122 |
container_issue |
12 |
container_start_page |
10,427 |
op_container_end_page |
10,439 |
_version_ |
1809942855130546176 |