Μελέτη της Ιστορικής Σεισμικότητας σε Σύνδεση με τον Ιστό Ενεργών Ρηγμάτων στην Περιοχή της Θεσσαλίας = Study of Historical Seismicity Associated with the Active Faults Network of Thessaly.

Δημητρούλα Αθανάσιος Ρόμπη

Μελέτη της Ιστορικής Σεισμικότητας σε Σύνδεση με τον Ιστό Ενεργών Ρηγμάτων στην Περιοχή της Θεσσαλίας = Study of Historical Seismicity Associated with the Active Faults Network of Thessaly.

Δημητρούλα Αθανάσιος Ρόμπη

Περίληψη

Η παρούσα πτυχιακή εργασία αποτελεί μία προσέγγιση μελέτης των ισχυρών σεισμών με μεγέθη Μ≥6.0 για την περιοχή της Θεσσαλίας σε σύνδεση με τον ιστό των κύριων ενεργών ρηγμάτων που αναπτύσσονται σε αυτήν. Για το σκοπό αυτό πραγματοποιήθηκε επισκόπηση της βιβλιογραφίας που σχετίζεται με τους ισχυρούς ιστορικούς σεισμούς που έγιναν στην περιοχή μελέτης. Από αυτή ότι η Θεσσαλία είναι μία περιοχή με χαμηλό ρυθμό γένεσης σεισμών, που όμως συνδέεται με σημαντικό αριθμό ισχυρών σεισμών που ανήκουν κυρίως στην ιστορική και την πρώιμη ενόργανη περιόδους της σεισμικότητας. Για τη μελέτη της σεισμικότητας της περιοχής χρησιμοποιήθηκαν 2 πλήρεις παραμετρικοί κατάλογοι σεισμικότητας που αφορούν τις περιόδους 1911-2022 και 1975-2022 για σεισμούς με μεγέθη Μ≥5.2 και Μ≥4.1, αντίστοιχα. Υπολογίστηκαν οι παράμετροι σεισμικότητας α_t και b του νόμου κατανομής των μεγεθών των Gutenberg-Richter με τη μέθοδο των ελαχίστων τετραγώνων, ενώ με βάση αυτές εκτιμήθηκαν και οι τιμές της μέσης περιόδου επανάληψης σεισμών με μεγέθη 5.0≤M≤7. Ακόμη, εκτιμήθηκαν οι τιμές του μέγιστου αναμενόμενου μεγέθους για κάθε ένα από τα 20 κύρια ρήγματα της περιοχής με την εφαρμογή εμπειριών σχέσεων μεταξύ του μήκους ρήγματος και του μέγιστου μεγέθους.

This thesis is an attempt to study the strong earthquakes with magnitudes M≥6.0 in Thessaly area, Greece, in connection with its active faults network. For this purpose, a review of the related literature concerning strong historical earthquakes that occurred in the study area was carried out. Although the historical seismicity data indicate that Thessaly is a region with a low seismicity rates, it is associated with a significant number of strong earthquakes that belong mainly to the historical and early instrumental periods of seismicity. To study the seismicity of the area, 2 complete earthquake catalogs were used covering the periods 1911-2022 and 1975-2022 for earthquakes with magnitudes M≥5.2 and M≥4.1, respectively. Seismicity parameters of the Gutenberg-Richter law were calculated via the least squares method, considering the aforementioned earthquake catalogs. The mean recurrence period of earthquakes with 5.0≤M≤7.0 were calculated, as well. Additionally, the maximum expected magnitudes of each of the 20 main faults of Thessaly region are estimated via empirical relations between the fault length and the corresponding maximum magnitude.

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