Rift obliquity in the Northern Volcanic Zone in Iceland using UAV-based structural data

Article Article scientifique Article Rift obliquity in the Northern Volcanic Zone in Iceland using UAV-based structural data eng 2024-04-12 2024-06 author Panza Elisabetta 0009-0001-0950-4024 913163 author Ruch Joel 506615 Services communs du département des sciences de la terre (DETCO) author Oestreicher Nicolas Kyochi 404612 Services communs du département des sciences de la terre (DETCO) 108072 10.1016/j.jvolgeores.2024.108072 0377-0273 https://linkinghub.elsevier.com/retrieve/pii/S0377027324000647 Rift obliquity is known to be very frequent at divergent plate boundaries and shear components in the opening of fissures have been detected through seismicity in the monitoring of recent rifting events. However, the field structural evidence of obliquity in active rifts for Holocene events is still poorly studied, despite its relevance at both the lithospheric and upper-crust scales. We performed extensive high resolution UAV surveys on Holocene terrains in four areas along the active rift in the Northern Volcanic Zone of Iceland, to map structures and morphotectonic features in detail. We did a kinematic analysis and found an increase of the obliquity from N to S. We further discuss the origins of this obliquity and suggest that the combination of inherited structures reactivation, magmatic intrusions, and topography influence on the propagation of both fractures and magma intrusions can have an impact on the mismatch between rift opening direction and the far-field strain. We conclude that obliquity can be inferred for Holocene rifting events from surface structural data. It is thus fundamental to take into account the existing structural pattern and its (re)activation history in active rift zones to avoid missing out on possible preferential structure reactivation, magma propagation ways, and eruption sites during the monitoring of ongoing rifting events. Rift obliquity Fault reactivation Dike intrusion Iceland Volcano-tectonics UAV survey Dewey 550 42 Département des sciences de la Terre 154 false 1273 Volcano-Tectonics https://osf.io/52yeh/?view_only=fc41367a22e74d1f86a7a1eec5d370a0 Journal of volcanology and geothermal research 450 56a13e61-1b40-480e-8f6a-b0cb9d4a01ce Article (Published version) Public Panza_et_al_2024_Rift_obliquity_in_.pdf 23898972 application/pdf CC BY-4.0 3b5eeb2077e6e0b5957b065e128b7ef14dfaa2d280d7f6b7f3348862f7b050d9 openAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département des sciences de la Terre

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Rift obliquity in the Northern Volcanic Zone in Iceland using UAV-based structural data	Journal of volcanology and geothermal research			2024	96	49

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Oestreicher, Nicolas Kyochi