Source mechanisms of the 2020 volcano-tectonic swarm on the Reykjanes Peninsula (Iceland) by probabilistic moment tensor inversion ...

• Main Authors: Büyükakpınar, Pınar, Cesca, Simone, Heimann, Sebastian, Kühn, Daniela, Lopez Comino, Jose Angel, Dahm, Torsten
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Reykjanes; Iceland
• Online Access: https://dx.doi.org/10.57757/iugg23-1942; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017597

<!--!introduction!--> In this study, we analyze the 2020 earthquake swarm on the Reykjanes Peninsula by moment tensor inversion in order to improve our understanding of the seismogenic processes and their relation with magmatic and tectonic activities. The densified seismic monitoring operational during the study period provides a unique dataset for the seismic sequence preceding the 2021 Fagradalsfjall eruption. We perform full moment tensor (MT) inversion for 85 earthquakes with magnitudes Mw > 2.5 using a probabilistic approach. For the first time, we attempted to integrate DAS data into the MT inversion. Focal mechanisms exhibit predominantly strike-slip faulting with a few normal faulting events and are overall compatible with the regional tectonic regime. Earthquake foci are shallow with an average depth of 3 km. We estimate robust, significant, positive isotropic components contributing up to 15% to the moment release. We hypothesize that the origin of such significant non-double-couple ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...