Προσομοιώσεις της ισχυρής σεισμικής κίνησης στο κοντινό πεδίο του σεισμού της Κω – Αλικαρνασσού 2017 = Near-field simulations of strong ground motion of the 2017 Kos – Halicarnassus earthquake.

Αντώνιος Ι. Χρήστου

Προσομοιώσεις της ισχυρής σεισμικής κίνησης στο κοντινό πεδίο του σεισμού της Κω – Αλικαρνασσού 2017 = Near-field simulations of strong ground motion of the 2017 Kos – Halicarnassus earthquake.

Αντώνιος Ι. Χρήστου

Περίληψη

Ο σεισμός της 20ης Ιουλίου 2017 (22:31UTC, M6.6) με επίκεντρο στη θαλάσσια περιοχή ανατολικά της νήσου Κω, προκάλεσε βλάβες τόσο στην πόλη της Κω, όσο και στην περιοχή της Αλικαρνασσού (Bodrum) της Τουρκίας. Δεν υπάρχουν καταγραφές της ισχυρής σεισμικής κίνησης στην πόλη της Κω για να ερμηνευθεί η κατανομή των βλαβών, και να διερευνηθεί η θέση και η κλίση του ρήγματος. Χρησιμοποιήθηκαν μικρού μεγέθους σεισμοί, ως εμπειρικές συναρτήσεις Green, και προσομοιώθηκε η ισχυρή σεισμική κίνηση στην πόλη της Κω. Για το λόγο αυτόν, συλλέχθηκαν όλα τα διαθέσιμα επιταχυνσιογραφήματα του κύριου σεισμού και των μετασεισμών του με Μ≥3.0. Διερευνήθηκαν δημοσιευμένα μοντέλα ολίσθησης της σεισμικής πηγής και προσδιορίσθηκε η περιοχή έκλυσης της μεγαλύτερης ενέργειας, (Strong Motion Generation Area, SMGA). Με βάση αυτήν και καταγραφές του κύριου σεισμού και των μετασεισμών καθορίστηκαν οι τιμές των παραμέτρων της σεισμικής πηγής, και στη συνέχεια βαθμονομήθηκαν στις θέσεις που υπήρχαν καταγραφές της ακολουθίας. Η προσομοίωση της ισχυρής δόνησης στην πόλη της Κω δίνει τιμές μέγιστης εδαφικής επιτάχυνσης μεταξύ 0.21g-0.28g, σε καλή συμφωνία με αποτελέσματα άλλων προσεγγίσεων εκτίμησής της, ενισχύοντας την αξιοπιστία της μεθοδολογίας των εμπειρικών συναρτήσεων Green (EGF).

The 20th July 2017 earthquake (22:31UTC, M6.6) with epicentre offshore of Kos island, caused damage both in Kos town and in Bodrum of Turkey. There are no records of strong ground motion in Kos town to relate with observed damage, and further investigation of the location and slip distribution on the fault plane. Here, we used small magnitude earthquakes as Empirical Green Functions, and simulated the mainshock’s strong ground motion in Kos town. We collected all the available accelerograms of the mainshock and its aftershocks with magnitude Μ≥3.0. We investigated published models of seismic source properties and determined the region of the strongest release of energy (referred to as Strong Motion Generation Area, SMGA). Based on this and on records of mainshock and its aftershocks, we searched the optimum values of seismic source parameters which best fitted the observed records. Having calibrated our model, we performed a blind simulation of the motion that would have been recorded at the strong motion station in Kos town. Our results predict values of peak ground acceleration between 0.21g to 0.28g, in good agreement with results of other approaches, strengthening the reliability of the EGFs method.

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