Μελέτη της σεισμικής έξαρσης του 2021 στην περιοχή Αρκαλοχωρίου, Κρήτης = Study of the seismic excitation in the area of Arkalochori, Crete, 2021.
Περίληψη
Στο πρώτο κεφάλαιο περιγράφονται οι σεισμοτεκτονικές ιδιότητες της Κρήτης, σε σύνδεση με την ιστορική και ενόργανη σεισμικότητα, με σκοπό να δοθεί μια πλήρης εικόνα για τη σεισμική συμπεριφορά της περιοχής και για τους παράγοντες που την επηρεάζουν. Στο δεύτερο κεφάλαιο αναλύονται η περιοχή μελέτης και τα χαρακτηριστικά του κύριου σεισμού. Στο τρίτο κεφάλαιο εξετάζονται λεπτομερώς τα βήματα επεξεργασίας της μετασεισμικής ακολουθίας (συλλογή δεδομένων, υπολογισμός λόγου ταχυτήτων και εύρεση μοντέλου ταχυτήτων επιμηκών κυμάτων, υπολογισμός χρονικών υπολοίπων σταθμών και σχετικός επαναπροσδιορισμός εστιών). Τέλος στο τέταρτο και πέμπτο κεφάλαιο γίνεται περιγραφή και ερμηνεία των αποτελεσμάτων, αντίστοιχα.
This diploma thesis focuses on the study of the aftershock activity, of the mainshock (Μ_w=6.0), which occurred in Arkalochori, Crete at 27th of September 2021. The studied area is defined by latitude 35.05°-35.25° and longitude 25.10°-25.40°. More specifically, aftershocks that occurred between 27 September 2021 and 26 November 2021, i.e. up to two months after the main earthquake, were analysed.
The first chapter describes the seismotectonic properties of Crete, in connection with historical and instrumental seismicity, in order to provide a complete picture of the seismic behaviour of the region and the factors influencing it. The second chapter analyses the study area and the characteristics of the main earthquake. The third chapter discusses in detail the processing steps of the aftershock sequence (data collection, velocity ratio calculation and finding of a long-wave velocity model, calculation of station time residuals and relative redefinition of focal points). Finally, the fourth and fifth chapters describe and interpret the results, respectively.
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