Assessment of landslide susceptibility using geospatial analysis and interfer...Pavlos Krassakis
The main purpose of the current study, was to examine the assessment of landslide susceptibility in the mountainous Municipalities of Nafpaktia and Karpenisi (Central Greece) by using geospatial analysis via RES (Rock Engineering System) and interferometry data.
Ninety percent of major earthquakes of the world directly indicating the sources of subduction and collision zones with shallow, intermediate, and deep focus earthquakes. The state of Sabah not indicating a high seismic risk zone and not directly associated with the Ring of fire. Nevertheless, it is positive towards seismic risk as the state experienced more than 65 earthquakes. However, no attention of researchers on comparative analysis of PGA map recorded in literature. Therefore, this study conducted; 1) to analyze the earthquake hazard and active tectonics of Sabah using PGA map derived from three methods and; 2) to understand the intersection of faults that can create isoseismic elongation. More than 90% of earthquakes are shallow and focused at a hypo-central distance of (0 ~ 100) km as resulted from this research. Therefore, Sabah had been experienced a highest magnitude of ~6.3, which can create the maximum PGA values of ~ (0.075, 0.06 and 0.08) based on three different attenuation equations proposed in this study. These earthquakes can produce a maximum intensity of (MMI~7) that is derived from the resulted PGA values. The study on active tectonics explains about the major 12 active faults and their intersection relationship. Therefore, this whole study has been conducted based on three attenuation relation to find out the best method for preparing the PGA map and the stereo net plotting using an integrated GIS technique.
Assessment of landslide susceptibility using geospatial analysis and interfer...Pavlos Krassakis
The main purpose of the current study, was to examine the assessment of landslide susceptibility in the mountainous Municipalities of Nafpaktia and Karpenisi (Central Greece) by using geospatial analysis via RES (Rock Engineering System) and interferometry data.
Ninety percent of major earthquakes of the world directly indicating the sources of subduction and collision zones with shallow, intermediate, and deep focus earthquakes. The state of Sabah not indicating a high seismic risk zone and not directly associated with the Ring of fire. Nevertheless, it is positive towards seismic risk as the state experienced more than 65 earthquakes. However, no attention of researchers on comparative analysis of PGA map recorded in literature. Therefore, this study conducted; 1) to analyze the earthquake hazard and active tectonics of Sabah using PGA map derived from three methods and; 2) to understand the intersection of faults that can create isoseismic elongation. More than 90% of earthquakes are shallow and focused at a hypo-central distance of (0 ~ 100) km as resulted from this research. Therefore, Sabah had been experienced a highest magnitude of ~6.3, which can create the maximum PGA values of ~ (0.075, 0.06 and 0.08) based on three different attenuation equations proposed in this study. These earthquakes can produce a maximum intensity of (MMI~7) that is derived from the resulted PGA values. The study on active tectonics explains about the major 12 active faults and their intersection relationship. Therefore, this whole study has been conducted based on three attenuation relation to find out the best method for preparing the PGA map and the stereo net plotting using an integrated GIS technique.
Geomorphology and GIS Analysis for Mapping Gully Erosion Susceptibility in Ta...ijtsrd
This study aim at performing geomorphological and GIS Analysis to map gully erosion susceptibility in Taraba State. GIS and Remote sensing integrated with Erodibility Variables Soil, Landuse and Erosivity Variables Elevation Aspect, plan Curvature, Stream Power index SPI , Topographic Wetness Index TWI , Length Slope Factor LSF were used in mapping gully erosion susceptibility. All Erosive Variables were automatically derived from SRTM DEM http earthexplorer.usgs.gov and were analyzed using 3D Analyst and Spatial Analyst Extensions of ArcGIS 10.1. The result shows that 2 are of very High Susceptibility, 33 High Susceptibility, 37 Moderate Susceptibility and 28 Low no Susceptibility. Idakwo Victor Iko-Ojo | Mark Ma’aku Joshua | Idakwo Francis Akoji "Geomorphology and GIS Analysis for Mapping Gully Erosion Susceptibility in Taraba State, Nigeria" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-5 , August 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33136.pdf Paper Url :https://www.ijtsrd.com/humanities-and-the-arts/geography/33136/geomorphology-and-gis-analysis-for-mapping-gully-erosion-susceptibility-in-taraba-state-nigeria/idakwo-victor-ikoojo
Surface Soil Moisture and Groundwater Assessment and Monitoring using Remote ...Jenkins Macedo
This preview is part of the requirement for a comprehensive analysis of remotely sensed surface soil moisture and groundwater assessment and monitoring for global environmental and climate change presented by Christina Geller, candidate for the degree of MSc in Geographic Information Science for Development, and Environment and Jenkins Macedo, candidate for the MS in Environmental Science and Policy at the Department of International Development, Community, and Environmental at Clark University.
Application of Remote Sensing Techniques for Change Detection in Land Use/ La...iosrjce
IOSR Journal of Applied Geology and Geophysics (IOSR-JAGG) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of Applied Geology and Geophysics. The journal welcomes publications of high quality papers on theoretical developments and practical applications in Applied Geology and Geophysics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
A global reference model of the lithosphere and upper mantle from joint inver...Sérgio Sacani
We present a new global model for the Earth’s lithosphere and upper mantle (LithoRef18) obtained
through a formal joint inversion of 3-D gravity anomalies, geoid height, satellite-derived
gravity gradients and absolute elevation complemented with seismic, thermal and petrological
prior information. The model includes crustal thickness, average crustal density, lithospheric
thickness, depth-dependent density of the lithospheric mantle, lithospheric geotherms, and average
density of the sublithospheric mantle down to 410 km depth with a surface discretization
of 2◦ × 2◦. Our results for lithospheric thickness and sublithospheric density structure are in
excellent agreement with estimates from recent seismic tomography models. A comparison
with higher resolution regional studies in a number of regions around the world indicates that
our values of crustal thickness and density are an improvement over a number of previous
global crustal models. Given the strong similarity with recent tomography models down to
410 km depth, LithoRef18 can be readily merged with these seismic models to include seismic
velocities as part of the reference model. We include several analyses of robustness and
reliability of input data, method and results. We also provide easy-to-use codes to interrogate
the model and use its predictions for the development of higher-resolution models.
Considering the model‘s features and data fitting statistics, LithoRef18 will be useful in
a wide range of geophysical and geochemical applications by serving as a reference or initial
lithospheric model for (i) higher-resolution gravity, seismological and/or integrated geophysical
studies of the lithosphere and upper mantle, (ii) including far-field effects in gravity-based
regional studies, (iii) global circulation/convection models that link the lithosphere with the
deep Earth, (iv) estimating residual, static and dynamic topography, (v) thermal modelling of
sedimentary basins and (vi) studying the links between the lithosphere and the deep Earth,
among others. Several avenues for improving the reliability of LithoRef18’s predictions are
also discussed. Finally, the inversion methodology presented in this work can be applied in
other planets for which potential field data sets are either the only or major constraints to their
internal structures (e.g. Moon, Venus, etc.).
Geological surveys are normally undertaken by private agencies, state government departs of mines and geology, and national geological survey organizations. They maintain the geological inventory of various formations, mineral deposits and resources. They keep all records for the advancement of knowledge of geosciences for the benefit of the nation. Geological mapping are parts of a geological survey. It involves certain procedures. This lesson highlights the methods and procedures of geological mapping.
Geophysical Challenge in Oil and Gas ProjectGilang Wiranda
The Oil and Gas industries, especially in the exploration stage rely so much on subsurface earth condition information. Geophysical methods are tools that help deliver much information to obtain good decisions in the oil and gas projects. All of it comes with some challenges in various aspect.
This describes the components of JGrass-NewAGE, the system we went to develop for having a flexible set of modelling solutions to forecast the water cycle budgets of any basin.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Geomorphology and GIS Analysis for Mapping Gully Erosion Susceptibility in Ta...ijtsrd
This study aim at performing geomorphological and GIS Analysis to map gully erosion susceptibility in Taraba State. GIS and Remote sensing integrated with Erodibility Variables Soil, Landuse and Erosivity Variables Elevation Aspect, plan Curvature, Stream Power index SPI , Topographic Wetness Index TWI , Length Slope Factor LSF were used in mapping gully erosion susceptibility. All Erosive Variables were automatically derived from SRTM DEM http earthexplorer.usgs.gov and were analyzed using 3D Analyst and Spatial Analyst Extensions of ArcGIS 10.1. The result shows that 2 are of very High Susceptibility, 33 High Susceptibility, 37 Moderate Susceptibility and 28 Low no Susceptibility. Idakwo Victor Iko-Ojo | Mark Ma’aku Joshua | Idakwo Francis Akoji "Geomorphology and GIS Analysis for Mapping Gully Erosion Susceptibility in Taraba State, Nigeria" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-5 , August 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33136.pdf Paper Url :https://www.ijtsrd.com/humanities-and-the-arts/geography/33136/geomorphology-and-gis-analysis-for-mapping-gully-erosion-susceptibility-in-taraba-state-nigeria/idakwo-victor-ikoojo
Surface Soil Moisture and Groundwater Assessment and Monitoring using Remote ...Jenkins Macedo
This preview is part of the requirement for a comprehensive analysis of remotely sensed surface soil moisture and groundwater assessment and monitoring for global environmental and climate change presented by Christina Geller, candidate for the degree of MSc in Geographic Information Science for Development, and Environment and Jenkins Macedo, candidate for the MS in Environmental Science and Policy at the Department of International Development, Community, and Environmental at Clark University.
Application of Remote Sensing Techniques for Change Detection in Land Use/ La...iosrjce
IOSR Journal of Applied Geology and Geophysics (IOSR-JAGG) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of Applied Geology and Geophysics. The journal welcomes publications of high quality papers on theoretical developments and practical applications in Applied Geology and Geophysics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
A global reference model of the lithosphere and upper mantle from joint inver...Sérgio Sacani
We present a new global model for the Earth’s lithosphere and upper mantle (LithoRef18) obtained
through a formal joint inversion of 3-D gravity anomalies, geoid height, satellite-derived
gravity gradients and absolute elevation complemented with seismic, thermal and petrological
prior information. The model includes crustal thickness, average crustal density, lithospheric
thickness, depth-dependent density of the lithospheric mantle, lithospheric geotherms, and average
density of the sublithospheric mantle down to 410 km depth with a surface discretization
of 2◦ × 2◦. Our results for lithospheric thickness and sublithospheric density structure are in
excellent agreement with estimates from recent seismic tomography models. A comparison
with higher resolution regional studies in a number of regions around the world indicates that
our values of crustal thickness and density are an improvement over a number of previous
global crustal models. Given the strong similarity with recent tomography models down to
410 km depth, LithoRef18 can be readily merged with these seismic models to include seismic
velocities as part of the reference model. We include several analyses of robustness and
reliability of input data, method and results. We also provide easy-to-use codes to interrogate
the model and use its predictions for the development of higher-resolution models.
Considering the model‘s features and data fitting statistics, LithoRef18 will be useful in
a wide range of geophysical and geochemical applications by serving as a reference or initial
lithospheric model for (i) higher-resolution gravity, seismological and/or integrated geophysical
studies of the lithosphere and upper mantle, (ii) including far-field effects in gravity-based
regional studies, (iii) global circulation/convection models that link the lithosphere with the
deep Earth, (iv) estimating residual, static and dynamic topography, (v) thermal modelling of
sedimentary basins and (vi) studying the links between the lithosphere and the deep Earth,
among others. Several avenues for improving the reliability of LithoRef18’s predictions are
also discussed. Finally, the inversion methodology presented in this work can be applied in
other planets for which potential field data sets are either the only or major constraints to their
internal structures (e.g. Moon, Venus, etc.).
Geological surveys are normally undertaken by private agencies, state government departs of mines and geology, and national geological survey organizations. They maintain the geological inventory of various formations, mineral deposits and resources. They keep all records for the advancement of knowledge of geosciences for the benefit of the nation. Geological mapping are parts of a geological survey. It involves certain procedures. This lesson highlights the methods and procedures of geological mapping.
Geophysical Challenge in Oil and Gas ProjectGilang Wiranda
The Oil and Gas industries, especially in the exploration stage rely so much on subsurface earth condition information. Geophysical methods are tools that help deliver much information to obtain good decisions in the oil and gas projects. All of it comes with some challenges in various aspect.
This describes the components of JGrass-NewAGE, the system we went to develop for having a flexible set of modelling solutions to forecast the water cycle budgets of any basin.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The conductivity structure of the Gediz Graben geothermal area extracted from...Erhan Erdogan
•Interpretation of MT data on extensional tectonic geothermal areas is examined using synthetic and field data.
•Three dimensional conductivity model of Gediz Graben geothermal area is created using seismic sections and used for producing synthetic magnetotelluric data.
•The resolving power of the two and three-dimensional inversion methods is discussed.
•Three dimensional inversion is applied to the field data and presented with real borehole results.
•New geothermal source was discovered using the MT data and three-dimensional inversion results.
Combined Geophysical And Geotechnical Techniques For Assessment Of Foundation...IRJESJOURNAL
Abstract: This study was carried out to assess the subsurface conditions around the school of technology complex in Lagos State Polytechnic, Ikorodu, using integrated geophysical and geotechnical techniques. The site lies within the Sedimentary terrain of southwestern Nigeria. Allied Ohmega Resistivity meter was used for data collection of 1-D and 2-D resistivitymeasurement while WinResist software and Dipro software were used for the processing respectively.The results of the vertical electrical sounding indicate that the depth to basement values ranges between 27.6 and 39.5m. The 2D resistivitysurvey has provided valuable information on the lateral and vertical variation of the layer competent for erecting foundation of engineering structures. The CPT probed an average depth of 4.8m and has identified material of very high shear strength associated with dense sand materials. The correlation of the three techniques used revealed similar soil layering consisting of topsoilsandy clay, coarse sand and sand.A mechanically stable coarse sand material was discovered as weathered layer which indicates high load bearing capacity suitable for foundation in the area and can support massive structures.
Advances in Geological and Geotechnical Engineering Research Vol 5 No 3 July ...Bilingual Publishing Group
Contribution of GIS to Hydromorphometric Characterization of the Nkoup Watershed (Nun Plain-Cameroon)
On the Possible Cometary Nature of the Uchur Cosmic Body (Fall 3.08. 1993)
Investigation of Physicochemical Properties of Qalay Abdul Ali Soil, Kabul, Afghanistan
Some Results of Direct FR Technology Applied to Study Methane Seepage Areas in the Arctic Region
Weather Events Associated with Strong Earthquakes and Seismic Swarms in Italy
Engineering geologists provide geological and geotechnical recommendations, analysis, and design associated with human development and various types of structures. Engineering geology is a promising subject for operational applications of geological knowledge. The future lies in this subject. Opportunities will increase for students specializing in this subject.
Safety is the primary and most important reason for monitoring the deformations of engineering structures. It could also help in improving our knowledge of the mechanical behaviour of engineering structures. Engineering structures are subject to deformation due to factors such as changes of ground water level, traffic load changes, tidal and tectonic phenomena. The Ikpoba River Bridge in Benin City whose traffic load has increased was monitored using GPS technology. The bridge was investigated as a result of carrying more load than usual due to the expansion of the road and dredging activities that had taken place in the river in 2008. One reference station and six monitoring points were involved in the monitoring of the bridge. The regularity of the survey was thirty days, and six observation epochs were used. Each monitoring point was occupied for about thirty minutes during the observation. The observation data were processed with compass software. The processed coordinates were adjusted with least squares adjustment technique. The standard deviation of unit weight for the weighted observations (σo) was computed for each observation epoch and was less than 1cm. The observation epochs were compared consecutively by finding the difference between successive observation results. The maximum differences in coordinates of the successive epochs were all less than 1mm. It was seen from the results that the bridge
was stable and did not undergo any displacement/movement within the period of study. It is recommended that the results of the six monitored points on the bridge should be further analyzed using other appropriate model of adjustment technique.
Φυλλάδιο για την συνοπτική παρουσίαση του ΙΤΣΑΚ με πληροφορίες για τον χαρακτήρα, τις ερευνητικές του δραστηριότητες καθώς και τις υποδομές που αναπτύσσει και συντηρεί (δίκτυα επιταχυνσιογράφων και υπολογιστικές υποδομές).
Απολογισμός ερευνητικών & τεχνολογικών δραστηριοτήτων του ΙΤΣΑΚ για το 2016. Κατάλογος ενεργών ερευνητικών προγραμμάτων, δημοσιεύσεων και άλλων δραστηριοτήτων.
Την 17η Απριλίου 2016 και ώρα 16:54 σημειώθηκε στη περιοχή του Σαρωνικού κόλπου μία ασθενής σεισμική δόνηση. Σύμφωνα με την ανακοίνωση του Εθνικού Σεισμογραφικού Δικτύου επρόκειτο για επιφανειακό σεισμό με το επίκεντρο του να εντοπίζεται βόρεια των ακτών της Αίγινας. Σύμφωνα με την ιστοσελίδα του Εργαστηρίου Γεωφυσικής του ΑΠΘ οι γεωγραφικές συντεταγμένες του επικέντρου του σεισμού είναι 37.815 ΟB 23.477 ΟA. Το μέγεθος του σεισμού υπολογίστηκε ίσο με ΜL=4.0 (http://geophysics.geo.auth.gr/the_seisnet/ATLAS/web/20160417_135449/). Ο σεισμός έγινε αισθητός στην Αίγινα, στην Αττική και ειδικά στο Λεκανοπέδιο της πρωτεύουσας.
Την 17η Νοεμβρίου 2015 και ώρα 07:10GMT σημειώθηκε στην περιοχή του Κεντρικού Ιονίου Πελάγους μία σφοδρή σεισμική δόνηση. Σύμφωνα με την ανακοίνωση του Εθνικού Σεισμογραφικού Δικτύου επρόκειτο για επιφανειακό σεισμό με το επίκεντρο του να εντοπίζεται κοντά στη Νοτιοδυτική ακτή της Λευκάδας. Σύμφωνα με την ιστοσελίδα του Γεωδυναμικού Ινστιτούτου οι γεωγραφικές συντεταγμένες του επικέντρου του οποίου είναι 38.6662 ΟB 20.5957 ΟA. Το μέγεθος του σεισμού υπολογίστηκε ίσο με ΜW=6.4.
Ενα καινοτόμο ερευνητικό πρόγραμμα που εφαρμόζεται παγκοσμίως μόνο στην Καλιφόρνια των Ηνωμένων Πολιτειών της Αμερικής και την Ιαπωνία έρχεται να πραγματοποιηθεί και στην Κεφαλονιά και συγκεκριμένα στην περιοχή του Κουτάβου.
Πρόκειται για ενα πείραμα κόστους 200.000 ευρώ που θα χρηματοδοτηθεί από τη Γαλλική Γραμματεία Ερευνας (*) και θα δώσει τη δυνατότητα στους επιστήμονες να καταλάβουν και να τεκμηριώσουν πως οι τοπικές εδαφικές συνθήκες μπορούν να συμβάλλουν στην κατανόηση του φαινομένου των σεισμικών δονήσεων. Η καταγραφή αυτών των αποτελεσμάτων, που θα είναι διαθέσιμα για όλους ανά πάσα στιγμή στο διαδίκτυο, θα συμβάλει στη βελτίωση του αντισεισμικού κανονισμού στην Ελλάδα αλλά και παγκόσμια και κατ’ επέκταση στη δημιουργία πιο ασφαλών κτιρίων. Για το σκοπό αυτό σχεδιάσθηκε και θα εγκατασταθεί στο Αργοστόλι Κεφαλλονιάς, ειδικό τρισδιάστατο δίκτυο σεισμογράφων/επιταχυνσιογράφων (ARGONET), οι κατραγραφές του οποίου θα συμβάλουν ουσιαστικά στην κατανόηση εκείνων των παραμέτρων που καθορίζουν τις αβεβαιότητες στην εκτίμηση της ισχυρής σεισμικής δόνησης.
Ολες οι λεπτομέρειες του συγκεκριμένου πειράματος αναλύθηκαν σε συνέντευξη Τύπου που πραγματοποιήθηκε στο ΤΕΙ Ιονίων Νήσων, το Σάββατο 6 Ιουνίου 2015, από τον Διευθυντή Ερευνών του ΟΑΣΠ-ΙΤΣΑΚ, Νίκο Θεοδουλίδη.
Strong Ground Motion Of The February 3, 2014 (M6.0) Cephalonia Earthquake: Effects On Soil And Built Environment In Combination With The January 26, 2014 (M6.1) Event
Την 15η Φεβρουαρίου 2014 και τοπική ώρα 09:31 έγινε ένας σεισμός έντονα αισθητός στο μεγαλύτερο τμήμα της Κεφαλονιάς ενώ ακολούθησε στις 10:18 ένας ακόμη σεισμός αισθητός ιδιαίτερα στο δυτικό τμήμα του νησιού. Οι δονήσεις αυτές εντάσσονται στην ακολουθία η οποία ξεκίνησε με τον σεισμό της 26ης Ιανουαρίου 2014 (Μw:6.1).
Στις 26 Ιανουαρίου 2014 και τοπική ώρα 15:55 (13:55 GMT) συνέβη ένας ισχυρός σεισμός μεγέθους ροπής Μw:6.1 (HRV) με επίκεντρο τις νοτιοδυτικές ακτές της Κεφαλονιάς, και συγκεκριμένα περί τα 9km νοτιοδυτικά του Ληξουρίου Σύμφωνα με την ιστοσελίδα του Σεισμολογικού Σταθμού του ΑΠΘ (http://geophysics.geo.auth.gr/the_seisnet/ATLAS/web/ majorquakes_gr.htm) πρόκειται για επιφανειακό σεισμό, με γεωγραφικές συντεταγμένες του επικέντρου 38.1610Β, 20.3400Α. Στις 20:45 ακολούθησε ένας μετασεισμός μεγέθους ροπής Μw:5.5 (HRV). Από τους μηχανισμούς γένεσης των δύο σεισμών φαίνεται ότι οι δύο σεισμοί σχετίζονται γενετικά με το ρήγμα διεύθυνσης της Κεφαλονιάς (Scordilis et al., 1985). Το ρήγμα αυτό είναι ένα δεξιόστροφο ρήγμα στο οποίο υπάρχει και ανάστροφη συνιστώσα (Παπαζάχος και Παπαζάχου, 1997, 2003).
Event "Is Thessaloniki Ready for EQ" - V.Lekidis - 2013-05-17
RSCy2013 Best Paper Award
1.
2. GEO-CHARACTERIZATION ACCORDING TO RECENT
ADVANCES OF EUROCODE (EC8)
Savvaidis A.*a
, Margaris B.a
, Theodoulidis N.a
, Lekidis V.a
, Karakostas Ch.a
, Mangriotis M-D.a
,
Kalogeras I.b
, Koutrakis S.b
, Vafidis A.c
, Steiakakis M.c
, Agioutantis Z.c
, Rozos D.d
, Loupasakis Cd
.,
Rondoyanni Th.d
, Tsangaratos P.d
, Dikmen U.e
, Papadopoulos N.f
, Sarris A.f
,
Soupios P.g
, Kokkinou E.g
, Papadopoulos I.g
, Kouli M.g
, and Vallianatos Fg
a
Institute of Engineering Seismology and Earthquake Engineering (EPPO), Thessaloniki, Greece;
b
Geodynamic Institute, National Observatory of Athens, Greece; c
Department of Mineral Resources
Engineering, Technical University of Crete, Greece; d
Laboratory of Engineering Geology and
Hydrogeology, Department of Geological Sciences, School of Mining and Metallurgical
Engineering, National Technical University of Athens, Greece; e
Department of Geophysics, Ankara
University, Turkey; f
Laboratory of Geophysical-Remote Sensing & Archaeoenvironment, Institute
for Mediterranean Studies, Foundation for Research & Technology Hellas, Greece; g
Laboratory of
Geophysics and Seismology, Department of Natural Resources and Environment, Technological
Educational Institute of Crete, Chania, Grete, Greece
ABSTRACT
For the seismic action estimation according to Eurocode (EC8) one has to characterize site conditions and suitably
estimate soil amplification and corresponding peak ground motion for the site. For this reason, as specified, one has to
define a design spectrum through the ground-type/soil-category (S), and the peak ground acceleration (PGA) of the
reference return period (TNCR) for the corresponding seismic zone and for structural technical requirements chosen by
the designer. Ground type is defined through geophysical/geotechnical parameters, i.e. (a) the average shear wave
velocity up to 30 meters depth, (b) the Standard Penetration Test blow-count, and (c) the undrained shear strength of soil.
Through the “GEO-CHARACTERIZATION” THALIS-PROJECT we combine different geophysical and geotechnical
methods in order to more accurately define the ground conditions in selected sites of the Hellenic Accelerometric
Network (HAN) in the area of Crete Island. More specifically in the present efforts, geological information shear wave
velocity and attenuation model calculated from seismic surface geophysical measurements is used. Additionally we
utilize the ground acceleration recorded through HAN 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 selected sites. The resulting information are compared with the values defined for the corresponding EC8
spectrum for the seismic zone comprising the island of Crete.
As a final outcome of this work we intend to propose regional normalized elastic spectra for seismic design of structures
and urban development planning and compare them with Eurocode.
Keywords: Natural Hazards, Earthquake Risk, Eurocode, Environmental protection, Crete.
*alexandros@itsak.gr; phone +3023100476081; fax +302310476085; www.itsak.gr