Unit:
Library of the School of ScienceΚατεύθυνση Πρόληψη και Διαχείριση των Φυσικών Καταστροφών
Author:
Μίχας Γεώργιος Χ.
Supervisors info:
Κ. Μακρόπουλος, Καθηγητής ΕΚΠΑ, Ν. Βούλγαρης, Επ. Καθηγητής ΕΚΠΑ, Π. Παπαδημητρίου, Επ. Καθηγητής ΕΚΠΑ
Original Title:
Μελέτη της επίδρασης της επιφανειακής γεωλογίας στη σεισμική κίνηση στην περιοχή του Κορινθιακού Κόλπου
Translated title:
Μελέτη της επίδρασης της επιφανειακής γεωλογίας στη σεισμική κίνηση στην περιοχή του Κορινθιακού Κόλπου
Summary:
This thesis refers to the evaluation of the soil response at specific sites at the region of Gulf of Corinth. The Gulf of Corinth (central Greece) composes a tectonically active region with high seismicity. In this area have been installed the RASMON network (Rio-Antirio Strong Motion Network), that constitutes of 12 digital accelerograph stations and the CORSSA array (Corinth Soft Soil Array), which is an array of 5 accelerometers in boreholes. During the operation of the network and the array, a great number of three-component digital recordings of strong motion have been obtained. Particularly, at the stations of the RASMON network have been recorded 3286 good quality three-component accelerograms and respectively 4290 at the five accelerometers of the CORSSA array, corresponding to more than 3000 seismic events. On the entire dataset have been applied the experimental techniques HVSR-RF (Horizontal to Vertical Spectral Ratio or Receiver Function technique) and SSR (Standard Spectral Ratio) on the recordings of CORSSA array, where the deepest accelerometer can be considered as a reference station. At the sites of the stations have also been performed microtremor measurements for the application of the well-known HVSR (Horizontal to Vertical Spectral Ratio) technique. From the application of the different techniques at each site the soil response is estimated and are being discussed the more complex site effects that are appearing and the applicability of the different techniques on a geologically complex region as is the Gulf of Corinth. The HVSR-RF technique, applied to a large dataset at each station, shows a rather good stability in the fundamental resonances but not and the relative amplification factors that seem to be controlled by co-ordination phenomena. The results of the HVSR technique are well correlated in most cases with the results of the HVSR-RF technique. The application of all three techniques (HVSR-RF, HVSR, SSR) at CORSSA showed that SSR can predict better both the fundamental resonances and the relative amplification factors from the other techniques as their results are influenced by the relative amplification of the vertical motion as well.
Main subject category:
Natural disasters
Other subject categories:
Earthquakes
Keywords:
Engineering Seismology, Corinth Gulf, Site effects, Seismic response, Microtremor analysis
Number of references:
496
