1. Αποθετήριο Παραδοτέων Υποτρόφων Δράσεων ΕΣΠΑ Τριτοβάθμιας Εκπαίδευσης 2017-2023
2. Όλο το Αποθετήριο
3. Ερευνητικές ομάδες

Τύπος:	Ανακοίνωση σε συνέδριο
Τίτλος:	An upper crust shear-wave splitting study for the period 2013-2014 in the Western Gulf of Corinth (Greece)
Συγγραφέας:	[EL] Καβύρης, Γεώργιος[EN] Kabyris, Georgios [EL] Καπετανίδης, Βασίλειος[EN] Kapetanidis, Vasilis [EL] Μίχας, Γιώργος[EN] Michas, Giorgos [EL] Βαλλιανάτος, Φίλιππος[EN] Vallianatos, Filippos
Ημερομηνία:	29/04/2021
Περίληψη:	Seismic anisotropy is investigated by performing an upper crust shear-wave splitting study in the Western Gulf of Corinth (WGoC). The study area, which is a tectonic rift located in Central Greece, is one of the most seismically active regions in Europe, characterized by a 10 to 15 mm/year extension rate in a NNW-SSE direction and E-W normal faulting. Intense seismic activity has been recorded in the WGoC during 2013-2014, including the 2013 Helike swarm, at the southern coast, and the offshore 2014 seismic sequence between Nafpaktos and Psathopyrgos, including an Mw 4.9 event on 21 September 2014. The largest event of the study period was an Mw 5.0 earthquake that occurred in November 2014, offshore Aigion, followed by an aftershock sequence. Seismicity was relocated using the double-difference method, including waveform cross-correlation differential travel-time data, yielding a high-resolution earthquake catalogue of approximately 9000 local events. This dataset was utilized in order to determine the shear-wave splitting parameters in seven stations installed at the WGoC, using a fully automatic technique based on the eigenvalue method and cluster analysis. A smaller subset was analyzed with the visual inspection method (polarigrams and hodograms) for verification of the automatic measurements. All selected station-event pairs were within the shear-wave window and had adequately high signal-to-noise ratio. The orientation of the seismometers of all stations used in the present study has been measured and verified in order to ensure the validity of the obtained fast shear-wave polarization directions and to apply corrections for borehole instruments. Mean anisotropy directions are in general agreement with the horizontal component of the dominant stress field, with some deviations, likely related to mapped faults and local stress anomalies. Temporal variations of time-delays between the two split shear-waves are examined in order to investigate their connection to possible stress field variations, related either to the occurrence of moderate to strong events or to fluid migration.
Γλώσσα:	Αγγλικά
Τόπος δημοσίευσης:	Virtually
Σελίδες:	1
DOI:	10.5194/egusphere-egu21-897
Θεματική κατηγορία:	[EL] Γεωφυσική[EN] Geophysics
Λέξεις-κλειδιά:	shear-wave splitting; Gulf of Corinth; upper-crust anisotropy; seismic swarms
Κάτοχος πνευματικών δικαιωμάτων:	© Author(s) 2021.
Όροι και προϋποθέσεις δικαιωμάτων:	This work is distributed under the Creative Commons Attribution 4.0 License.
Διατίθεται ανοιχτά στην τοποθεσία:	https://www.academia.edu/82720253/An_upper_crust_shear_wave_splitting_study_for_the_period_2013_2014_in_the_Western_Gulf_of_Corinth_Greece_
Ηλεκτρονική διεύθυνση του τεκμηρίου στον εκδότη:	https://meetingorganizer.copernicus.org/EGU21/EGU21-897.html
Όνομα εκδήλωσης:	EGU General Assembly 2021
Τοποθεσία εκδήλωσης:	Virtual Conference
Ημ/νία έναρξης εκδήλωσης:	19/04/2021
Ημ/νία λήξης εκδήλωσης:	30/04/2021
Σημειώσεις:	GD7.1 Anisotropy from crust to core: Observations, models and implications https://meetingorganizer.copernicus.org/EGU21/session/39789 The present research is co-financed by Greece and the European Union (European Social Fund- ESF) through the Operational Programme «Human Resources Development, Education and Lifelong Learning 2014-2020» in the context of the project “The role of fluids in the seismicity of the Western Gulf of Corinth (Greece)” (MIS 5048127).
Εμφανίζεται στις συλλογές:	Ερευνητικές ομάδες