The shaping of a volcanic ridge in a tectonically active setting: The Pico-Faial Ridge in the Azores Triple Junction
International audience The Pico-Faial ridge is a steep WNW-ESE volcanic ridge that has developed within the Nubia-Eurasia diffuse plate boundary, close to the Azores Triple Junction. The ridge comprises two islands, Pico and Faial, separated by a shallow (< 100 m depth) and narrow (< 8 km) cha...
Published in: | Geomorphology |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.science/hal-03398817 https://hal.science/hal-03398817/document https://hal.science/hal-03398817/file/Marques_et_al_2021_Geomorphology_MinorRevision.pdf https://doi.org/10.1016/j.geomorph.2021.107612 |
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ftuniparissaclay:oai:HAL:hal-03398817v1 |
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openpolar |
institution |
Open Polar |
collection |
Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
English |
topic |
S. Jorge Island rift shoulder Terceira Rift Azores Triple Junction large-scale landslides and flank collapses rotation by rift flank uplift Pico-Faial volcanic ridge GPS ground motion marine geophysical data tectonics large-scale flank collapse [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences |
spellingShingle |
S. Jorge Island rift shoulder Terceira Rift Azores Triple Junction large-scale landslides and flank collapses rotation by rift flank uplift Pico-Faial volcanic ridge GPS ground motion marine geophysical data tectonics large-scale flank collapse [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences Ornelas Marques, Fernando Catalão, João Hübscher, Christian Goulart Costa, Ana, Cristina Hildenbrand, A. Zeyen, Hermann Nomikou, Paraskevi Lebas, Elodie Zanon, Vittorio The shaping of a volcanic ridge in a tectonically active setting: The Pico-Faial Ridge in the Azores Triple Junction |
topic_facet |
S. Jorge Island rift shoulder Terceira Rift Azores Triple Junction large-scale landslides and flank collapses rotation by rift flank uplift Pico-Faial volcanic ridge GPS ground motion marine geophysical data tectonics large-scale flank collapse [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences |
description |
International audience The Pico-Faial ridge is a steep WNW-ESE volcanic ridge that has developed within the Nubia-Eurasia diffuse plate boundary, close to the Azores Triple Junction. The ridge comprises two islands, Pico and Faial, separated by a shallow (< 100 m depth) and narrow (< 8 km) channel. Despite some similarities, the two islands show contrasting features still deserving explanation: (1) meaning of GPS data; (2) meaning of palaeomagnetic data; (3) the island-scale Faial Graben does not have a counterpart in Pico; (4) both islands comprise a main central volcano each, but the one in Faial is symmetrical and the one in Pico is asymmetrical; (5) Pico shows evidence of at least two large-scale flank collapses, but none has been recognized so far in Faial. The new data reported here lead to the following probable answers: (1) the GPS data show much larger vertical and horizontal ground motions in Faial, which could be the result of recent volcanism and tectonics; (2) the cyclicity inferred from the paleomagnetic data in Pico could be related to inflation/deflation cycles that could have triggered the inferred flank collapses; (3) the Faial Graben ends abruptly at the eastern edge of the island, which we interpret as inhibited propagation to the east because of the load and stresses imposed by the nearby large Pico Volcano; (4) we attribute the asymmetry of the Pico Volcano to partial flank collapse recognizable in new offshore seismic profiles; (5) either the Faial island is actually gravitationally more stable, or there have been flank collapses not yet recognized. All these processes have concurred to shape the two islands and the ridge to their current morphology, but the current morphologies of Pico and Faial result mainly from three of these processes: volcanism, tectonics and large-scale landslides. |
author2 |
Universidade de Lisboa = University of Lisbon = Université de Lisbonne (ULISBOA) Instituto Dom Luiz Center for Earth System Research and Sustainability (CEN) Universität Hamburg (UHH) Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) National and Kapodistrian University of Athens (NKUA) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Instituto de Investigacao em Vulcanologia e Avaliacao de Riscos MEGAHazards2 (PTDC/GEO-GEO/0946/2014), FCT (Portugal) |
format |
Article in Journal/Newspaper |
author |
Ornelas Marques, Fernando Catalão, João Hübscher, Christian Goulart Costa, Ana, Cristina Hildenbrand, A. Zeyen, Hermann Nomikou, Paraskevi Lebas, Elodie Zanon, Vittorio |
author_facet |
Ornelas Marques, Fernando Catalão, João Hübscher, Christian Goulart Costa, Ana, Cristina Hildenbrand, A. Zeyen, Hermann Nomikou, Paraskevi Lebas, Elodie Zanon, Vittorio |
author_sort |
Ornelas Marques, Fernando |
title |
The shaping of a volcanic ridge in a tectonically active setting: The Pico-Faial Ridge in the Azores Triple Junction |
title_short |
The shaping of a volcanic ridge in a tectonically active setting: The Pico-Faial Ridge in the Azores Triple Junction |
title_full |
The shaping of a volcanic ridge in a tectonically active setting: The Pico-Faial Ridge in the Azores Triple Junction |
title_fullStr |
The shaping of a volcanic ridge in a tectonically active setting: The Pico-Faial Ridge in the Azores Triple Junction |
title_full_unstemmed |
The shaping of a volcanic ridge in a tectonically active setting: The Pico-Faial Ridge in the Azores Triple Junction |
title_sort |
shaping of a volcanic ridge in a tectonically active setting: the pico-faial ridge in the azores triple junction |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03398817 https://hal.science/hal-03398817/document https://hal.science/hal-03398817/file/Marques_et_al_2021_Geomorphology_MinorRevision.pdf https://doi.org/10.1016/j.geomorph.2021.107612 |
long_lat |
ENVELOPE(-59.767,-59.767,-62.383,-62.383) |
geographic |
Jorge Island |
geographic_facet |
Jorge Island |
genre |
Jorge Island |
genre_facet |
Jorge Island |
op_source |
ISSN: 0169-555X Geomorphology https://hal.science/hal-03398817 Geomorphology, 2021, 378, pp.107612. ⟨10.1016/j.geomorph.2021.107612⟩ https://www.sciencedirect.com/science/article/abs/pii/S0169555X21000210 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2021.107612 hal-03398817 https://hal.science/hal-03398817 https://hal.science/hal-03398817/document https://hal.science/hal-03398817/file/Marques_et_al_2021_Geomorphology_MinorRevision.pdf doi:10.1016/j.geomorph.2021.107612 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.geomorph.2021.107612 |
container_title |
Geomorphology |
container_volume |
378 |
container_start_page |
107612 |
_version_ |
1802646313701998592 |
spelling |
ftuniparissaclay:oai:HAL:hal-03398817v1 2024-06-23T07:54:14+00:00 The shaping of a volcanic ridge in a tectonically active setting: The Pico-Faial Ridge in the Azores Triple Junction Ornelas Marques, Fernando Catalão, João Hübscher, Christian Goulart Costa, Ana, Cristina Hildenbrand, A. Zeyen, Hermann Nomikou, Paraskevi Lebas, Elodie Zanon, Vittorio Universidade de Lisboa = University of Lisbon = Université de Lisbonne (ULISBOA) Instituto Dom Luiz Center for Earth System Research and Sustainability (CEN) Universität Hamburg (UHH) Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) National and Kapodistrian University of Athens (NKUA) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Instituto de Investigacao em Vulcanologia e Avaliacao de Riscos MEGAHazards2 (PTDC/GEO-GEO/0946/2014), FCT (Portugal) 2021 https://hal.science/hal-03398817 https://hal.science/hal-03398817/document https://hal.science/hal-03398817/file/Marques_et_al_2021_Geomorphology_MinorRevision.pdf https://doi.org/10.1016/j.geomorph.2021.107612 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2021.107612 hal-03398817 https://hal.science/hal-03398817 https://hal.science/hal-03398817/document https://hal.science/hal-03398817/file/Marques_et_al_2021_Geomorphology_MinorRevision.pdf doi:10.1016/j.geomorph.2021.107612 info:eu-repo/semantics/OpenAccess ISSN: 0169-555X Geomorphology https://hal.science/hal-03398817 Geomorphology, 2021, 378, pp.107612. ⟨10.1016/j.geomorph.2021.107612⟩ https://www.sciencedirect.com/science/article/abs/pii/S0169555X21000210 S. Jorge Island rift shoulder Terceira Rift Azores Triple Junction large-scale landslides and flank collapses rotation by rift flank uplift Pico-Faial volcanic ridge GPS ground motion marine geophysical data tectonics large-scale flank collapse [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftuniparissaclay https://doi.org/10.1016/j.geomorph.2021.107612 2024-05-30T23:43:32Z International audience The Pico-Faial ridge is a steep WNW-ESE volcanic ridge that has developed within the Nubia-Eurasia diffuse plate boundary, close to the Azores Triple Junction. The ridge comprises two islands, Pico and Faial, separated by a shallow (< 100 m depth) and narrow (< 8 km) channel. Despite some similarities, the two islands show contrasting features still deserving explanation: (1) meaning of GPS data; (2) meaning of palaeomagnetic data; (3) the island-scale Faial Graben does not have a counterpart in Pico; (4) both islands comprise a main central volcano each, but the one in Faial is symmetrical and the one in Pico is asymmetrical; (5) Pico shows evidence of at least two large-scale flank collapses, but none has been recognized so far in Faial. The new data reported here lead to the following probable answers: (1) the GPS data show much larger vertical and horizontal ground motions in Faial, which could be the result of recent volcanism and tectonics; (2) the cyclicity inferred from the paleomagnetic data in Pico could be related to inflation/deflation cycles that could have triggered the inferred flank collapses; (3) the Faial Graben ends abruptly at the eastern edge of the island, which we interpret as inhibited propagation to the east because of the load and stresses imposed by the nearby large Pico Volcano; (4) we attribute the asymmetry of the Pico Volcano to partial flank collapse recognizable in new offshore seismic profiles; (5) either the Faial island is actually gravitationally more stable, or there have been flank collapses not yet recognized. All these processes have concurred to shape the two islands and the ridge to their current morphology, but the current morphologies of Pico and Faial result mainly from three of these processes: volcanism, tectonics and large-scale landslides. Article in Journal/Newspaper Jorge Island Archives ouvertes de Paris-Saclay Jorge Island ENVELOPE(-59.767,-59.767,-62.383,-62.383) Geomorphology 378 107612 |