From surface fault traces to a fault growth model: the Vogar fissure swarm of the Reykjanes Peninsula, Southwest Iceland
International audience The Vogar Fissure Swarm is one of four en-echelon fracture swarms that connect the Reykjanes Ridge to the South Iceland Seismic Zone and the Western Volcanic Zone. Occurring in an area of flat topography, this fissure swarm is clearly visible at the surface, where it can be se...
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Language: | English |
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Online Access: | https://hal.science/hal-00815189 https://hal.science/hal-00815189/document https://hal.science/hal-00815189/file/Villemant_etal_JournalStructuralGeology_2013.pdf https://doi.org/10.1016/j.jsg.2013.03.010 |
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ftunigrenoble:oai:HAL:hal-00815189v1 2024-05-12T08:05:48+00:00 From surface fault traces to a fault growth model: the Vogar fissure swarm of the Reykjanes Peninsula, Southwest Iceland Villemin, Thierry Bergerat, Françoise Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 2013 https://hal.science/hal-00815189 https://hal.science/hal-00815189/document https://hal.science/hal-00815189/file/Villemant_etal_JournalStructuralGeology_2013.pdf https://doi.org/10.1016/j.jsg.2013.03.010 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsg.2013.03.010 hal-00815189 https://hal.science/hal-00815189 https://hal.science/hal-00815189/document https://hal.science/hal-00815189/file/Villemant_etal_JournalStructuralGeology_2013.pdf doi:10.1016/j.jsg.2013.03.010 info:eu-repo/semantics/OpenAccess ISSN: 0191-8141 Journal of Structural Geology https://hal.science/hal-00815189 Journal of Structural Geology, 2013, pp.1-35. ⟨10.1016/j.jsg.2013.03.010⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2013 ftunigrenoble https://doi.org/10.1016/j.jsg.2013.03.010 2024-04-18T02:16:37Z International audience The Vogar Fissure Swarm is one of four en-echelon fracture swarms that connect the Reykjanes Ridge to the South Iceland Seismic Zone and the Western Volcanic Zone. Occurring in an area of flat topography, this fissure swarm is clearly visible at the surface, where it can be seen to affect recent postglacial lavas. Using remote sensing methods to identify and measure all the faults and fractures in the swarm, combined with additional field observations and measurements, we measured 478 individual fractures, 33% of them being faults and 67% being fissures. The fracture lengths show roughly log-normal distributions. Most of the individual fractures belong to 68 main composite fractures, seven of which are longer than 2500 m and correspond to the main fault scarps of the fissure swarm. We showed that these main faults are distributed along five, equally spaced zones, ~500 m apart and a few kilometers long. We drawn 71 across-strike profiles to characterize the shape of the fault scarps, and 5 along-strike profiles to characterize the evolution of vertical throw along the main faults. Each fault consists of a coalescence of individual segments of approximately equal length. Fault throws are never larger than 10 m and are smallest at the junctions between individual segments. Analyses of along-strike throw profiles allowed us to determine the early stages of growth after coalescence. The earliest stage is characterized by an increase in the throw of the central parts of segments. This is followed by a second stage during which the throw increases at the junctions between segments, progressively erasing these small- throw zones. Article in Journal/Newspaper Iceland Université Grenoble Alpes: HAL Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Journal of Structural Geology 51 38 51 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Villemin, Thierry Bergerat, Françoise From surface fault traces to a fault growth model: the Vogar fissure swarm of the Reykjanes Peninsula, Southwest Iceland |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Vogar Fissure Swarm is one of four en-echelon fracture swarms that connect the Reykjanes Ridge to the South Iceland Seismic Zone and the Western Volcanic Zone. Occurring in an area of flat topography, this fissure swarm is clearly visible at the surface, where it can be seen to affect recent postglacial lavas. Using remote sensing methods to identify and measure all the faults and fractures in the swarm, combined with additional field observations and measurements, we measured 478 individual fractures, 33% of them being faults and 67% being fissures. The fracture lengths show roughly log-normal distributions. Most of the individual fractures belong to 68 main composite fractures, seven of which are longer than 2500 m and correspond to the main fault scarps of the fissure swarm. We showed that these main faults are distributed along five, equally spaced zones, ~500 m apart and a few kilometers long. We drawn 71 across-strike profiles to characterize the shape of the fault scarps, and 5 along-strike profiles to characterize the evolution of vertical throw along the main faults. Each fault consists of a coalescence of individual segments of approximately equal length. Fault throws are never larger than 10 m and are smallest at the junctions between individual segments. Analyses of along-strike throw profiles allowed us to determine the early stages of growth after coalescence. The earliest stage is characterized by an increase in the throw of the central parts of segments. This is followed by a second stage during which the throw increases at the junctions between segments, progressively erasing these small- throw zones. |
author2 |
Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Villemin, Thierry Bergerat, Françoise |
author_facet |
Villemin, Thierry Bergerat, Françoise |
author_sort |
Villemin, Thierry |
title |
From surface fault traces to a fault growth model: the Vogar fissure swarm of the Reykjanes Peninsula, Southwest Iceland |
title_short |
From surface fault traces to a fault growth model: the Vogar fissure swarm of the Reykjanes Peninsula, Southwest Iceland |
title_full |
From surface fault traces to a fault growth model: the Vogar fissure swarm of the Reykjanes Peninsula, Southwest Iceland |
title_fullStr |
From surface fault traces to a fault growth model: the Vogar fissure swarm of the Reykjanes Peninsula, Southwest Iceland |
title_full_unstemmed |
From surface fault traces to a fault growth model: the Vogar fissure swarm of the Reykjanes Peninsula, Southwest Iceland |
title_sort |
from surface fault traces to a fault growth model: the vogar fissure swarm of the reykjanes peninsula, southwest iceland |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-00815189 https://hal.science/hal-00815189/document https://hal.science/hal-00815189/file/Villemant_etal_JournalStructuralGeology_2013.pdf https://doi.org/10.1016/j.jsg.2013.03.010 |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Reykjanes |
geographic_facet |
Reykjanes |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0191-8141 Journal of Structural Geology https://hal.science/hal-00815189 Journal of Structural Geology, 2013, pp.1-35. ⟨10.1016/j.jsg.2013.03.010⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsg.2013.03.010 hal-00815189 https://hal.science/hal-00815189 https://hal.science/hal-00815189/document https://hal.science/hal-00815189/file/Villemant_etal_JournalStructuralGeology_2013.pdf doi:10.1016/j.jsg.2013.03.010 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.jsg.2013.03.010 |
container_title |
Journal of Structural Geology |
container_volume |
51 |
container_start_page |
38 |
op_container_end_page |
51 |
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1798848167851065344 |