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Geo-Characterization at selected accelerometric stations in Crete (Greece) and comparison of earthquake data recordings with EC8 elastic spectra |
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| Authors: | A Savvaidis B Margaris N Theodoulidis V Lekidis Ch Karakostas C Loupasakis D Rozos P Soupios M -D Mangriotis U Dikmen Par Tsangaratos E Kokinou A Vafidis Th Rondoyanni I Kalogeras S Koutrakis A Sarris N Papadopoulos |
| Institution: | 1. Institute of Engineering Seismology and Earthquake Engineering (EPPO), Thessaloniki, Greece 2. Laboratory of Engineering Geology and Hydrogeology, Department of Geological Sciences, School of Mining and Metallurgical Engineering, National Technical University of Athens, Athens, Greece 3. Laboratory of Geophysics and Seismology, Department of Natural Resources and Environment, Technological Educational Institute of Crete, Chania, Crete, Greece 4. Institute of Petroleum Engineering, Heriot-Watt University, Edinburgh, UK 5. Department of Engineering Geophysics, Engineering Faculty, Ankara University, Ankara, Turkey 6. Applied Geophysics Laboratory, School of Mineral Resources Engineering, Technical University of Crete, Crete, Greece 7. Institute of Geodynamics, National Observatory of Athens, Athens, Greece 8. Laboratory of Geophysical-Remote Sensing & Archaeoenvironment, Institute for Mediterranean Studies, Foundation for Research & Technology Hellas, Athens, Greece |
| Abstract: | To estimate the seismic response according to Eurocode (EC8) and almost all other national codes, site conditions have to be properly characterized so that soil amplification and the corresponding peak ground motion can be calculated. In this work, different geophysical and geotechnical methods are combined in order to define the detailed ground conditions in selected sites of the Hellenic Accelerometric Network (HAN) in Crete. For this purpose, the geological information of the sites and shear wave velocity, calculated from surface wave measurements, is used. Additionally, ground acceleration data recorded through HAN have been utilized from intermediate depth earthquakes in the broader area of South Aegean Sea. Using the recorded ground motion data and the procedure defined in EC8, the corresponding elastic response spectrum is calculated for the selected sites. The resulting information is compared to the values defined in the corresponding EC8 spectrum for the seismic zone that includes the island of Crete. The comparison shows that accurate definition of ground type through geological, geotechnical and geophysical investigations is important. However, our current comparison focuses on the distribution of values rather than the absolute values of EC8-prescribed spectra, and the results should be considered in this context. |
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