Tectonic stress as the driving mechanism for dike opening in an oblique rift setting: A deformation model of the 2021 Fagradalsfjall dike, Iceland
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| Název: | Tectonic stress as the driving mechanism for dike opening in an oblique rift setting: A deformation model of the 2021 Fagradalsfjall dike, Iceland |
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| Autoři: | Greiner, Sonja H. M., Sigmundsson, Freysteinn, Geirsson, Halldór, Burchardt, Steffi, 1982, Galland, Olivier |
| Zdroj: | Geophysical Research Letters. 52(8) |
| Témata: | Volcano-tectonic interaction, ground deformation, stress, Reykjanes Peninsula, Finite Element Method, Dikes |
| Popis: | Repeated dike-intrusions often occur in zones where extensional stress has accumulated. Still, geodetic modeling of observed dike-induced ground deformation often ignores the contribution of tectonic stress. On the obliquely spreading Reykjanes Peninsula, Iceland, tectonic strain build-up had been geodetically documented for three decades when a magmatic dike formed at Fagradalsfjall in 2021. We explore the contribution of tectonic stress on dike emplacement in a viscoelastic three-dimensional Finite-Element deformation model. Tectonic stress accumulation is initially simulated through plate motion, and later partially released by opening of a segmented rectangular dike. We find that surface deformation can be largely reproduced by releasing 60% of the accumulated tectonic stress. Partial stress release and low magma overpressure are consistent with successive dike intrusions and low-intensity eruptions in the area. Our model provides an approach to consistently model stress-release constrained by surface deformation. |
| Popis souboru: | electronic |
| Přístupová URL adresa: | https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-554098 https://doi.org/10.1029/2024GL113970 |
| Databáze: | SwePub |
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Nájsť tento článok vo Web of Science | Abstrakt: | Repeated dike-intrusions often occur in zones where extensional stress has accumulated. Still, geodetic modeling of observed dike-induced ground deformation often ignores the contribution of tectonic stress. On the obliquely spreading Reykjanes Peninsula, Iceland, tectonic strain build-up had been geodetically documented for three decades when a magmatic dike formed at Fagradalsfjall in 2021. We explore the contribution of tectonic stress on dike emplacement in a viscoelastic three-dimensional Finite-Element deformation model. Tectonic stress accumulation is initially simulated through plate motion, and later partially released by opening of a segmented rectangular dike. We find that surface deformation can be largely reproduced by releasing 60% of the accumulated tectonic stress. Partial stress release and low magma overpressure are consistent with successive dike intrusions and low-intensity eruptions in the area. Our model provides an approach to consistently model stress-release constrained by surface deformation. |
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| ISSN: | 00948276 19448007 |
| DOI: | 10.1029/2024GL113970 |