Recent Macaronesian kinematics from GNSS ground displacement analysis
Macaronesia is a complex oceanic region spanning three tectonic plates in the northeast Atlantic ocean. It is composed of four archipelagos, widely distributed and limited to the east by the Iberian Peninsula and north-western coast of Africa. This study aims to clarify recent Macaronesian kinematic...
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/17059 2023-05-15T17:41:39+02:00 Recent Macaronesian kinematics from GNSS ground displacement analysis Barbero, Ignacio Torrecillas, Cristina Paez, Raul Prates, Gonçalo Berrocoso, Manuel 2021-01 http://hdl.handle.net/10400.1/17059 https://doi.org/10.1007/s11200-020-1122-x eng eng SPRINGER 0039-3169 http://hdl.handle.net/10400.1/17059 doi:10.1007/s11200-020-1122-x restrictedAccess Continuous GNSS time series Canary Islands Cluster analysis Strain rate analysis Isostatic adjustment Geochemistry & Geophysics article 2021 ftunivalgarve https://doi.org/10.1007/s11200-020-1122-x 2022-07-06T00:01:03Z Macaronesia is a complex oceanic region spanning three tectonic plates in the northeast Atlantic ocean. It is composed of four archipelagos, widely distributed and limited to the east by the Iberian Peninsula and north-western coast of Africa. This study aims to clarify recent Macaronesian kinematics from 19 GNSS stations located on the four archipelagos and the Iberian and African coastlines. The analysis is based on nearly 15 years of common data acquisition and aimed to detect new effects of intraplate tectonics or similar local/regional events consistent with calculated ground displacements. Evaluating the GNSS stations residual velocities relative to those expected from the NNR-MORVEL56 model, higher residuals were found at continental coastal stations (Africa) than at oceanic ones (Canaries and Madeira). From the computed strain rate map, the possible existence of a shear zone connecting the Gloria and Transmoroccan fault systems, already mentioned by other authors, was depicted. Cluster statistical analysis of the horizontal residual velocities helped to identify tectonic boundaries in Macaronesia and four groups of analogous intraplate residual velocities within this region. Three of four groups were identified in the Azores, highlighting the African-Nubian-Eurasian diffuse plate boundary in this region. Furthermore, in the Canary Islands, two distinct kinematic behaviours were detected, possibly due to the activity along a previously detected tectonic fault between Tenerife and Gran Canaria, where some stations have similar intraplate residuals to those at Madeira and Cape Verde stations, while others have similar intraplate residuals to those of continental stations. Finally, all stations on oceanic crust, except Cape Verde, present recent ground subsidence which may be attributed to isostatic adjustment. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Northeast Atlantic Universidade do Algarve: Sapienta Nubian ENVELOPE(166.417,166.417,-78.250,-78.250) Studia Geophysica et Geodaetica 65 1 15 35 |
institution |
Open Polar |
collection |
Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
Continuous GNSS time series Canary Islands Cluster analysis Strain rate analysis Isostatic adjustment Geochemistry & Geophysics |
spellingShingle |
Continuous GNSS time series Canary Islands Cluster analysis Strain rate analysis Isostatic adjustment Geochemistry & Geophysics Barbero, Ignacio Torrecillas, Cristina Paez, Raul Prates, Gonçalo Berrocoso, Manuel Recent Macaronesian kinematics from GNSS ground displacement analysis |
topic_facet |
Continuous GNSS time series Canary Islands Cluster analysis Strain rate analysis Isostatic adjustment Geochemistry & Geophysics |
description |
Macaronesia is a complex oceanic region spanning three tectonic plates in the northeast Atlantic ocean. It is composed of four archipelagos, widely distributed and limited to the east by the Iberian Peninsula and north-western coast of Africa. This study aims to clarify recent Macaronesian kinematics from 19 GNSS stations located on the four archipelagos and the Iberian and African coastlines. The analysis is based on nearly 15 years of common data acquisition and aimed to detect new effects of intraplate tectonics or similar local/regional events consistent with calculated ground displacements. Evaluating the GNSS stations residual velocities relative to those expected from the NNR-MORVEL56 model, higher residuals were found at continental coastal stations (Africa) than at oceanic ones (Canaries and Madeira). From the computed strain rate map, the possible existence of a shear zone connecting the Gloria and Transmoroccan fault systems, already mentioned by other authors, was depicted. Cluster statistical analysis of the horizontal residual velocities helped to identify tectonic boundaries in Macaronesia and four groups of analogous intraplate residual velocities within this region. Three of four groups were identified in the Azores, highlighting the African-Nubian-Eurasian diffuse plate boundary in this region. Furthermore, in the Canary Islands, two distinct kinematic behaviours were detected, possibly due to the activity along a previously detected tectonic fault between Tenerife and Gran Canaria, where some stations have similar intraplate residuals to those at Madeira and Cape Verde stations, while others have similar intraplate residuals to those of continental stations. Finally, all stations on oceanic crust, except Cape Verde, present recent ground subsidence which may be attributed to isostatic adjustment. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Barbero, Ignacio Torrecillas, Cristina Paez, Raul Prates, Gonçalo Berrocoso, Manuel |
author_facet |
Barbero, Ignacio Torrecillas, Cristina Paez, Raul Prates, Gonçalo Berrocoso, Manuel |
author_sort |
Barbero, Ignacio |
title |
Recent Macaronesian kinematics from GNSS ground displacement analysis |
title_short |
Recent Macaronesian kinematics from GNSS ground displacement analysis |
title_full |
Recent Macaronesian kinematics from GNSS ground displacement analysis |
title_fullStr |
Recent Macaronesian kinematics from GNSS ground displacement analysis |
title_full_unstemmed |
Recent Macaronesian kinematics from GNSS ground displacement analysis |
title_sort |
recent macaronesian kinematics from gnss ground displacement analysis |
publisher |
SPRINGER |
publishDate |
2021 |
url |
http://hdl.handle.net/10400.1/17059 https://doi.org/10.1007/s11200-020-1122-x |
long_lat |
ENVELOPE(166.417,166.417,-78.250,-78.250) |
geographic |
Nubian |
geographic_facet |
Nubian |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
0039-3169 http://hdl.handle.net/10400.1/17059 doi:10.1007/s11200-020-1122-x |
op_rights |
restrictedAccess |
op_doi |
https://doi.org/10.1007/s11200-020-1122-x |
container_title |
Studia Geophysica et Geodaetica |
container_volume |
65 |
container_issue |
1 |
container_start_page |
15 |
op_container_end_page |
35 |
_version_ |
1766143334830571520 |