Source parameters of the 24 May 2014 North Aegean earthquake

Ευαγγελία Τσακιρούδη

Source parameters of the 24 May 2014 North Aegean earthquake

Ευαγγελία Τσακιρούδη

Περίληψη

Σκοπός της παρούσας διατριβής ήταν ο προσδιορισμός των παραμέτρων σεισμικής πηγής και το μοντέλο ολίσθησης πεπερασμένης πηγής του σεισμού του Βορείου Αιγαίου της 24ης του Μάη 2014, με την εφαρμογή τριών μεθόδων: φασματική ανάλυση, αντιστροφή τανυστή σεισμικής ροπής και αντιστροφή της ολίσθησης τηλεσεισμικών δεδομένων. Η μέθοδος φασματικής ανάλυσης διεξήχθη σε Ρ και S τηλεσεισμικά φάσματα, προκειμένου να υπολογιστεί η σεισμική ροπή, το μέγεθος ροπής και η γωνιακή συχνότητα. Οι τιμές που προέκυψαν χρησιμοποιούνται σε διάφορες εμπειρικές σχέσεις για τον υπολογισμό των διαστάσεων της πηγής, της πτώσης τάσης και της μέγιστης μετάθεσης. Η μέθοδος της αντιστροφής τανυστή ροπής χρησιμοποιήθηκε για τον υπολογισμό του μηχανισμού γένεσης, της σεισμικής ροπής και της χρονικής συνάρτησης πηγής του σεισμού. Το μοντέλο ολίσθησης προσδιορίστηκε με τη μέθοδο της αντιστροφής ολίσθησης.Ένας άλλος στόχος της μελέτης ήταν η διερεύνηση σχετικά με το πώς οι προαναφερθείσες τρεις διαφορετικές τεχνικές μπορούν να συνδυαστούν προκειμένου να επιλυθούν καλύτερα πολύπλοκα σεισμικά γεγονότα.

The aim of the present thesis was the determination of the source parameters and the finite fault slip model of the 24 May 2014 North Aegean earthquake, with the application of three methods: spectral analysis, moment tensor inversion and slip inversion of teleseismic data. The spectral analysis method was carried out on P and S teleseismic wave spectra, in order to calculate seismic moment, moment magnitude and corner frequency. The resulted values were input parameters in various empirical relations in order to derive the source dimensions, stress drop and maximum dislocation. The method of moment tensor inversion was used to determine the focal mechanism, seismic moment and source time function of the earthquake. The finite fault slip model was derived by the method of slip inversion. Another aim of this study was the investigation on how the aforementioned three different techniques could be combined in order to best resolve complex seismic events.

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Αναφορές

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