tailieunhanh - Source modelling and stress transfer scenarios of the October 30, 2020 Samos earthquake: seismotectonic implications

On October 30, 2020, a strong earthquake (–) occurred offshore, just north of Samos Island, causing life losses, injuries and damages, especially on the Turkish side. The broader area is characterized by a complex geodynamic setting with both rich seismic history and numerous active faults of different direction and kinematics. The first aim of this study is to define the seismic source of the mainshock, based on seismological and geodetic data (GPS measurements and originally processed GNSS records), as well as our field observations on Samos Island few days after the mainshock. The integration of this information leads to a N-dipping normal fault (Kaystrios fault) that controls the central-northern coast of Samos Island. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 699-717 http earth TÜBİTAK Research Article doi yer-2107-25 Source modelling and stress transfer scenarios of the October 30 2020 Samos earthquake seismotectonic implications 1 2 3 4 4 Sotiris SBORAS Ilias LAZOS Stylianos BITHARIS Christos PIKRIDAS 1 4 3 3 Dimitris GALANAKIS Aristeidis FOTIOU Alexandros CHATZIPETROS Spyros PAVLIDES 1 Hellenic Survey of Geology amp Mineral Exploration HSGME Attica Greece 2 Institute of Geodynamics National Observatory of Athens Lofos Nymfon Athens Greece 3 Aristotle University of Thessaloniki School of Geology University Campus Thessaloniki Greece 4 Aristotle University of Thessaloniki School of Rural and Surveying Engineering University Campus Thessaloniki Greece Received Accepted Published Online Final Version Abstract On October 30 2020 a strong earthquake occurred offshore just north of Samos Island causing life losses injuries and damages especially on the Turkish side. The broader area is characterized by a complex geodynamic setting with both rich seismic history and numerous active faults of different direction and kinematics. The first aim of this study is to define the seismic source of the mainshock based on seismological and geodetic data GPS measurements and originally processed GNSS records as well as our field observations on Samos Island few days after the mainshock. The integration of this information leads to a N-dipping normal fault Kaystrios fault that controls the central-northern coast of Samos Island. We modelled the seismic source and calculated the theoretical dislocation using the Okada formulae on the surrounding GPS GNSS stations comparing it with the measured values. The results are very encouraging especially on the station installed on Samos Island giving confidence to our source model. We then used our seismic source to study the spatiotemporal evolution of the .

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