Tim Greenfield, Tom Winder, Nicholas Rawlinson, John Maclennan, Robert S. White, Thorbjörg Ágústsdóttir, Conor Andrew Bacon, Bryndis Brandsdóttir, Eva P. S. Eibl, Esme Glastonbury-Southern, Egill Árni Gudnason, Gylfi Páll Hersir, Josef Horálek
- We use a dense seismic network on the Reykjanes Peninsula, Iceland, to image a group of earthquakes at 10-12 km depth, 2 km north-east of 2021 Fagradalsfjall eruption site. These deep earthquakes have a lower frequency content compared to earthquakes located in the upper, brittle crust and are similar to deep long period (DLP) seismicity observed at other volcanoes in Iceland and around the world. We observed several swarms of DLP earthquakes between the start of the study period (June 2020) and the initiation of the 3-week-long dyke intrusion that preceded the eruption in March 2021. During the eruption, DLP earthquake swarms returned 1 km SW of their original location during periods when the discharge rate or fountaining style of the eruption changed. The DLP seismicity is therefore likely to be linked to the magma plumbing system beneath Fagradalsfjall. However, the DLP seismicity occurred similar to 5 km shallower than where petrological modelling places the near-Moho magma storage region in which the Fagradalsfjall lava wasWe use a dense seismic network on the Reykjanes Peninsula, Iceland, to image a group of earthquakes at 10-12 km depth, 2 km north-east of 2021 Fagradalsfjall eruption site. These deep earthquakes have a lower frequency content compared to earthquakes located in the upper, brittle crust and are similar to deep long period (DLP) seismicity observed at other volcanoes in Iceland and around the world. We observed several swarms of DLP earthquakes between the start of the study period (June 2020) and the initiation of the 3-week-long dyke intrusion that preceded the eruption in March 2021. During the eruption, DLP earthquake swarms returned 1 km SW of their original location during periods when the discharge rate or fountaining style of the eruption changed. The DLP seismicity is therefore likely to be linked to the magma plumbing system beneath Fagradalsfjall. However, the DLP seismicity occurred similar to 5 km shallower than where petrological modelling places the near-Moho magma storage region in which the Fagradalsfjall lava was stored. We suggest that the DLP seismicity was triggered by the exsolution of CO2-rich fluids or the movement of magma at a barrier to the transport of melt in the lower crust. Increased flux through the magma plumbing system during the eruption likely adds to the complexity of the melt migration process, thus causing further DLP seismicity, despite a contemporaneous magma channel to the surface.…
MetadatenVerfasserangaben: | Tim GreenfieldORCiD, Tom Winder, Nicholas Rawlinson, John MaclennanORCiD, Robert S. White, Thorbjörg Ágústsdóttir, Conor Andrew BaconORCiD, Bryndis BrandsdóttirORCiD, Eva P. S. EiblORCiD, Esme Glastonbury-Southern, Egill Árni Gudnason, Gylfi Páll Hersir, Josef HorálekORCiD |
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DOI: | https://doi.org/10.1007/s00445-022-01603-2 |
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ISSN: | 0258-8900 |
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ISSN: | 1432-0819 |
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Titel des übergeordneten Werks (Englisch): | Bulletin of volcanology : official journal of the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) |
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Verlag: | Springer |
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Verlagsort: | Berlin ; Heidelberg ; New York |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Datum der Erstveröffentlichung: | 04.11.2022 |
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Erscheinungsjahr: | 2022 |
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Datum der Freischaltung: | 10.11.2023 |
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Freies Schlagwort / Tag: | Fagradalsfjall; Iceland; Reykjanes; deep long-period earthquakes; low-frequency; magma plumbing system |
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Band: | 84 |
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Ausgabe: | 12 |
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Aufsatznummer: | 101 |
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Seitenanzahl: | 20 |
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Fördernde Institution: | Leverhulme Early Career Fellowship [ECF-049]; NERC via Urgency Grant; [NE/W004690/1]; EEA Grants; Technology Agency of the Czech Republic; within the Kappa Programme |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
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DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
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Peer Review: | Referiert |
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Publikationsweg: | Open Access / Hybrid Open-Access |
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Lizenz (Deutsch): | CC-BY - Namensnennung 4.0 International |
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