Source mechanisms of the earthquake swarms linked to the 2021 Fagradalsfjall volcanic eruption (SW Iceland)
We retrieved source mechanisms in the moment-tensor description (MT) of an intense earthquake-swarm activity on the Reykjanes Peninsula (SW Iceland) in 2020 to 2021 preceding the Fagradalsfjall volcanic eruption in March 2021. We inverted displacement amplitudes of the direct P- and S-waves from a l...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5017850 2023-10-09T21:52:41+02:00 Source mechanisms of the earthquake swarms linked to the 2021 Fagradalsfjall volcanic eruption (SW Iceland) Horalek, J. Šílený, J. Doubravová, J. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017850 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1741 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017850 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-1741 2023-09-24T23:43:20Z We retrieved source mechanisms in the moment-tensor description (MT) of an intense earthquake-swarm activity on the Reykjanes Peninsula (SW Iceland) in 2020 to 2021 preceding the Fagradalsfjall volcanic eruption in March 2021. We inverted displacement amplitudes of the direct P- and S-waves from a local network REYKJANET complemented the network of the University of Cambridge and by the near stations of the regional SIL network; a total of about 30 stations covering well the Fagradalsfjall are used. For a sufficient resolution of the source mechanism an accurate enough response of the medium the Green’s function (GF) is demanded. For this purpose we used a 1-D velocity model for the Reykjanes Peninsula by Vogfjörd et al. (2002). For the GF construction, we applied the ray theory. Substantial effort has been devoted to facilitate a batch processing of the events, first of all it means to allow the ANRAY to work in a semi-automatic regime, which is not its inherent mode of work. As a result, we have a comprehensive tool for retrieval of MTs on the Reykjanes Peninsula. We demonstrate its usefulness by treating a set of several tens of events. Source mechanisms of some of them are compared to those obtained by ISOLA, a software for processing of regional earthquakes, which however applies different data and different approach. Our set of MTs retrieved provides a deeper insight into the mechanism of faulting due to dyke propagation in the region in question from the beginning of 2020 to March of 2021. Conference Object Iceland GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
We retrieved source mechanisms in the moment-tensor description (MT) of an intense earthquake-swarm activity on the Reykjanes Peninsula (SW Iceland) in 2020 to 2021 preceding the Fagradalsfjall volcanic eruption in March 2021. We inverted displacement amplitudes of the direct P- and S-waves from a local network REYKJANET complemented the network of the University of Cambridge and by the near stations of the regional SIL network; a total of about 30 stations covering well the Fagradalsfjall are used. For a sufficient resolution of the source mechanism an accurate enough response of the medium the Green’s function (GF) is demanded. For this purpose we used a 1-D velocity model for the Reykjanes Peninsula by Vogfjörd et al. (2002). For the GF construction, we applied the ray theory. Substantial effort has been devoted to facilitate a batch processing of the events, first of all it means to allow the ANRAY to work in a semi-automatic regime, which is not its inherent mode of work. As a result, we have a comprehensive tool for retrieval of MTs on the Reykjanes Peninsula. We demonstrate its usefulness by treating a set of several tens of events. Source mechanisms of some of them are compared to those obtained by ISOLA, a software for processing of regional earthquakes, which however applies different data and different approach. Our set of MTs retrieved provides a deeper insight into the mechanism of faulting due to dyke propagation in the region in question from the beginning of 2020 to March of 2021. |
format |
Conference Object |
author |
Horalek, J. Šílený, J. Doubravová, J. |
spellingShingle |
Horalek, J. Šílený, J. Doubravová, J. Source mechanisms of the earthquake swarms linked to the 2021 Fagradalsfjall volcanic eruption (SW Iceland) |
author_facet |
Horalek, J. Šílený, J. Doubravová, J. |
author_sort |
Horalek, J. |
title |
Source mechanisms of the earthquake swarms linked to the 2021 Fagradalsfjall volcanic eruption (SW Iceland) |
title_short |
Source mechanisms of the earthquake swarms linked to the 2021 Fagradalsfjall volcanic eruption (SW Iceland) |
title_full |
Source mechanisms of the earthquake swarms linked to the 2021 Fagradalsfjall volcanic eruption (SW Iceland) |
title_fullStr |
Source mechanisms of the earthquake swarms linked to the 2021 Fagradalsfjall volcanic eruption (SW Iceland) |
title_full_unstemmed |
Source mechanisms of the earthquake swarms linked to the 2021 Fagradalsfjall volcanic eruption (SW Iceland) |
title_sort |
source mechanisms of the earthquake swarms linked to the 2021 fagradalsfjall volcanic eruption (sw iceland) |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017850 |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Reykjanes |
geographic_facet |
Reykjanes |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1741 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017850 |
op_doi |
https://doi.org/10.57757/IUGG23-1741 |
_version_ |
1779315856366370816 |