tsunami hazard in the southeast aegean sea abstract we present a systematic assessment of the earthquake generated tsunami hazard for the greek island of rhodes in the se aegean sea our approach is based on numerical hydrodynamic simulations including inundation computations with most coupled with accurate bathymetry and topography data of the study area we have considered several hypothetical credible near field worst case scenarios and here we present results for four associated with seismic events of magnitude 8 0 to 8 4 our results include calculations of the maximum inundation the maximum wave elevation and the maximum flow depth in specific locales and assess the influence of the epicenter location on the tsunami hazard for time windows of 100 500 and 1000 years we illustrate our findings with lines superimposed on satellite images as maps indicating the estimated maximum values and in terms of two dimensional histograms given that our composite inundation for a 1000 year time period with our monte carlo variation of epicenters is overall larger than the inundation computed for existing well established worst case scenarios we caution the indiscriminate use of the latter in evaluating inundation in highly populated areas

seismicity of the aegean and surrounding area abstract seismicity parameters based on instrumental and historical data are given for 36 seismic sources of shallow earthquakes and for 6 seismic sources of intermediate depth earthquakes in the aegean and surrounding area 34 n 43 n 18 e 30 e these parameters are of two categories parameters of the first category are useful for seismic hazard evaluation a and b values of the frequency magnitude relation maximum earthquake magnitude number of shocks larger than certain magnitude per year while parameters of the second category are proper for describing the spatial distribution of seismicity mean return period most probable magnitude in a certain time period moment rate shallow seismicity is highest along the convex side of the hellenic arc but close to the coast ionian islands south peloponnesus south of crete south of karpathos and rhodos in central greece patraikos corinthiakos evoikos gulfs thessalia and along a seismic belt which includes the northwestern anatolia fault zone the northernmost part of the aegean sea and the serbomacedonia zone the intermediate depth seismic activity is distributed in two parts of the benioff zone which dips from the convex side eastern mediterranean to the concave side aegean sea of the hellenic arc the one part shows a low dip angle and includes earthquakes with focal depths between 70 km and 100 km this part has a high seismicity earthquake magnitudes up to 8 0 and is situated below the inner slope of the sedimentary part of the hellenic arc eastern peloponnesus north of crete rhodos based on the fact that this part of the benioff zone is a continuation of the seismic zone of shallow earthquakes along the hellenic arc and that both zones have the same seismicity it is concluded that they constitute a continuous seismic belt on which coupling occurs between the subducted eastern mediterranean lithosphere and the overthrusted aegean lithosphere the other inner part of the benioff zone shows low seismicity maximum earthquake magnitude up to 7 1 with earthquakes of focal depths between 100 km and 180 km it dips at a mean angle of 38 below the volcanic arc of the southern aegean sea and is the result of the subduction of the front part of the eastern mediterranean lithosphere without coupling with the aegean lithosphere

evidence for transform faulting in the ionian sea the cephalonia island earthquake sequence of 1983 accurate locations of aftershocks of the january 17 1983 ms 7 0 main shock in the ionian islands have been determined as well as fault plane solutions for this main shock and its largest aftershock which are interpreted as a right lateral strike slip motion with a thrust component on a fault striking in about a ne sw direction

a contribution to seismic hazard assessment in croatia from deterministic modeling some of the elements of regional seismic hazard in croatia are assessed by computing synthetic accelerograms at a predetermined set of sites the input dataset consists of structural models parameters of seismic sources and an updated earthquake catalog synthetic strong motion time series for frequencies below 1 hz are computed on a grid of sites using the modal summation technique the long period hazard is described by the distribution of estimated peak values of ground displacement velocity and acceleration while the short period hazard is represented by the map of design ground acceleration values dga the highest values of dga exceeding 0 35 g on the base rock level are found in the southeastern coastal part of the country in the greater dubrovnik area

shear velocity structure in the aegean area obtained by inversion of rayleigh waves summary the purpose of this work is to derive a 3 d tomographic image of the shear wave velocity structure of the crust uppermost mantle in the aegean area using the group velocities of rayleigh wave fundamental mode the database consists of 185 regional earthquakes recorded at broad band stations that were installed for a period of 6 month in the aegean area within the framework of a large scale experiment in a previous work karagianni et al 2002 an averaged group velocity has been determined using the method of frequency time analysis ftan for each epicentre station ray path and the data were used in order to determine the local group velocities for different periods over the area covered by the seismic ray paths taking into account additional resolution results obtained for the local group velocities a grid of 0 5 was adopted for the aegean area and a local dispersion curve was defined for each gridpoint more than 80 local dispersion curves were finally inverted using a non linear inversion approach deriving the corresponding 1 d shear velocity models the interpolation of these models resulted in a 3 d s wave tomographic image of the crust and uppermost mantle in the broader aegean area as expected as a result of the complex tectonic setting of the aegean area strong lateral variations of the s wave velocities of the crust and uppermost mantle of the studied area are found in the southern aegean sea as well as in a large part of the central aegean sea a thin crust of approximately 20 22 km is observed whereas the remaining aegean sea area exhibits a crustal thickness less than 28 30 km on the contrary a crustal thickness of 40 46 km is observed in western greece along the hellenides mountain range whereas in the eastern continental greece the crust has a typical thickness of approximately 30 34 km for shallow depths 10 km low s wave velocities are observed under the sedimentary basins of the north aegean sea the gulf of thermaikos axios basin and western greece at depths ranging from 10 to 20 km low s wave velocities are mainly found in western greece under peloponnesus as well as in rhodes this low velocity zone seems to extend along the hellenic arc and can be correlated to the hellenides mountain range and the alpine orogenesis in agreement with previous p wave tomographic results in the southern aegean sea very low s wave velocities 3 6 4 0 km s 1 are observed at depths of approximately 30 40 km just below the moho discontinuity while in the rest of the inner aegean sea and continental greece the uppermost mantle is characterized by velocities around 4 3 4 4 km s 1 this low velocity zone in the southern aegean sea can be associated with the high temperatures and the presence of significant percentage partial melt in the mantle wedge of the southern aegean subduction zone in agreement with previous studies

deterministic seismic hazard in egypt summary the regional seismic hazard in egypt is assessed using a deterministic approach based on the computation of synthetic seismograms at a set of gridpoints located at distances of 0 2u from each other the main input for this computation are earthquake sources and structural models the earthquake sources are parametrized using focal mechanisms seismogenic areas and regional seismicity a number of deep seismic profiles have been used to define the crustal structures similar sets of gravity profiles have been used to define the density of the layers the peak displacement dmax peak velocity vmax and design ground acceleration dga are chosen and plotted to construct the seismic hazard maps there are similarities between computed and observed amplitudes of ground motion in terms of their values and spatial distributions the results obtained from the deterministic and probabilistic approaches are comparable the areas of high seismic hazard level are of great socio economic importance

active tectonics of the north and central aegean sea summary in this paper we examine the connection between the westward motion of turkey relative to europe and the extension in and around the aegean sea the principal new data available since the last attempt to synthesize the tectonics of this region by mckenzie 1978 are much improved focal mechanisms of earthquakes constrained by p and sh body wave modelling as well as by first motions these mechanisms show that the faulting in the western part of the aegean region is mostly extensional in nature on normal faults with a nw to wnw strike and with slip vectors directed nnw to nne there is evidence from palaeomagnetism that this western region rotates clockwise relative to stable europe in the central and eastern aegean and in nw turkey distributed right lateral strike slip is more prevalent on faults trending ne to ene and with slip vectors directed ne palaeomagnetic data in this eastern region is more ambiguous but consistent with very small or no rotations in the northern part and possibly anticlockwise rotations relative to europe in the south the strike slip faulting that enters the central aegean from the east appears to end abruptly in the sw against the nw trending normal faults of greece the kinematics of the deformation is controlled by three factors the westward motion of turkey relative to europe the continental collision between nw greece albania and the apulia adriatic platform in the west and the presence of the hellenic subduction zone to the south as the right lateral slip on the north anatolian fault enters the aegean region it splays out becoming distributed on several parallel faults the continental shortening in nw greece and albania does not allow the rotation of the western margin of the region to be rapid enough to accommodate this distributed e w right lateral shear and thus leads to e w shortening in the northern aegean which is compensated by n s extension as the southern aegean margin can move easily over the hellenic subduction zone the dynamics of the system once initiated is self sustaining being driven by the high topography in eastern turkey and by the roll back of the subducted slab beneath the southern aegean the geometry of the deformation resembles the behaviour of a system of broken slats attached to margins that rotate in spite of its extreme simplicity a simple model of such broken slats is able to reproduce quantitatively most of the features of the instantaneous velocity field in the aegean region including the slip vectors and nature of the faulting in the eastern and western parts the senses and approximate rates of rotation the overall extensional velocity across the aegean and the distribution of strain rates as seen in the seismicity and topography or bathymetry and using geodetic measurements as part of this study we re examined the relation between the surface faulting and the focal parameters determined seismologically for the three large 1981 gulf of corinth earthquakes and reassessed the evidence for associating particular earthquakes in the sequence with observed surface faulting an important result is that in one of the events there is a resolvable discrepancy between the slip vector measured at the surface and that determined from the seismic body waves

anisotropic radiation modelling of macroseismic intensities for estimation of the attenuation structure of the upper crust in greece a method is suggested for the analysis of macroseismic intensity data in order to accurately determine an average attenuation structure of the upper part of the crust in an area the method is based on a model which assumes that the observed intensities depend on source properties radiation pattern size focal depth geometrical spreading and anelastic attenuation the method is applied to 13 008 intensity values observed in corresponding sites of greece and grouped in 4228 groups according to their spatial clustering in order to diminish observational errors and site effects an average intensity attenuation coefficient c 0 0039 0 0016 corresponding to a quality factor q 350 140 is determined for the upper 20 km of the crust in this area this value is relatively low in good agreement with the relatively high heat flow and high seismic activity of this area a byproduct of the present study is the determination for each earthquake of a macroseismic focal depth and of a macroseismic size which is strongly correlatted with both the earthquake s magnitude and its seismic moment determined by independent methods

focal mechanisms of weak earthquakes from amplitude spectra and polarities the aspo method amplitude spectra and polarities for the focal mechanism retrieval from relatively weak events is based on a widely available instrumental setup a few broadband stations within a denser short period network collectively all stations provide the epicenter location complete records are taken from three component broadband stations without selecting a particular wave type or picking amplitudes it makes the method suitable for automated data processing and enables studies of the interference crustal phases only the amplitude spectra are inverted this is a robust feature which makes the method insensitive to any timing problems such as those due to uncertain origin time or due to technical failures the first motion polarities serve as an additional constraint of the amplitude spectra inversion only few clear polarities are taken from the nearest stations wher e they mostly belong to direct p waves the method seeks five parameters the focal depth scalar moment strike dip and rake green s function automatically including possible near field effects and interference e g surface waves is calculated by the discrete wavenumber method aspo works below the corner frequency and the time function is not being retrieved this feature not only minimizes the number of the inverted parameters but also speeds up the calculation because the lower the frequency the faster the discrete wavenumber run instead of an exceedingly slow 5 parameter grid search the inversion is organized in two steps i the depth and moment determination with a coarse grid search of the strike dip and rake and ii a fine grid search of the three source angles uncertainty of the best fitting solution is assessed from the minimum error value and from the scatter of the nodal lines and or p and t axes between min and min 10 the method was tested on the clustered m 3 5 earthquakes recorded by a temporary network of three cmg3 t broadband stations in western corinth gulf a fundamental problem is that the broadband stations suffer systematically from event induced instabilities at horizontal components if earthquakes of the studied magnitudes occur at short distances 10 30 km therefore the aspo method could not be applied below 0 1 hz as such the results are sensitive with respect to unknown crustal structure details and the focal mechanisms remain rather uncertain minimum error higher than 0 34 compared to synthetic tests with perturbed data in which the error is lower than 0 2 it is concluded that the crustal model needs further improvement

p and s deep velocity structure of the hellenic area obtained by robust nonlinear inversion of travel times we derived a new model for the p and s velocity structure of the lithosphere in the subduction area of the hellenic arc and the aegean sea from the inversion of travel times of local events the inversion technique applied is nonlinear since three dimensional ray tracing is incorporated at the same time an appropriate preconditioning of the final linearized system is used in order to reduce ray density effects on the results the p s coherency is controlled by an additional damping of the vp vs ratio the study focuses mainly on the structure of the hellenic subduction in the southern aegean region interesting features and details of the subducted slab can be recognized in the final tomographic images on the western part the shallower section of the slab is dipping at a very small angle 10 this changes to approximately 25 for the deeper part of the subduction resulting in a prominent kink at a depth of about 70 km which is in accordance with the general characteristics of the associated benioff zone the smaller eastern part of the slab is not resolved with the same detail but a clearly steeper subduction zone can be recognized moreover detailed information about the crustal thickness variations are inferred from the velocity structure and correlate very well with the existing results from refraction experiments finally the results confirm the recent suggestion concerning the existence of a low velocity crustal layer at shallow depths 10 15 km in the accretionary prism of the alpine belt

a deterministic seismic hazard analysis for shallow earthquakes in greece abstract the maximum expected ground motion in greece is estimated for shallow earthquakes using a deterministic seismic hazard analysis dsha in order to accomplish this analysis the input data include an homogeneous catalogue of earthquakes for the period 426 bc 2003 a seismogenic source model with representative focal mechanisms and a set of velocity models because of the discrete character of the earthquake catalogue and of errors in location of single seismic events a smoothing algorithm is applied to the catalogue of the main shocks to get a spatially smoothed distribution of magnitude based on the selected input parameters synthetic seismograms for an upper frequency content of 1 hz are computed on a grid of 0 2 0 2 the resultant horizontal components for displacement velocity acceleration and dga design ground acceleration are mapped the maps which depict these results cannot be compared with previously published maps based on probabilistic methodologies as the latter were compiled for a mean return period of 476 years therefore in order to validate our deterministic analysis the final results are compared with pga estimated from the maximum observed macroseismic intensity in greece during the period 426 bc 2003 since the results are obtained for point sources with the frequency content scaled with moment magnitude some sensitivity tests are performed to assess the influence of the finite extent of fault related to large events sensitivity tests are also performed to investigate the changes in the peak ground motion quantities when varying the crustal velocity models in some seismogenic areas the ratios and the relative differences between the results obtained using different models are mapped and their mean value computed the results highlight the importance in the deterministic approach of using good and reliable velocity models

degradation and maturity controls on oil field petroleum column heterogeneity in the gullfaks field norwegian north sea abstract a geochemical mapping of the gullfaks reservoir petroleum column based on 226 reservoir core extracts and 23 drill stem test dst and repeat formation test rft oil samples indicates the presence of statistically testable lateral compositional heterogeneities in the petroleum column these different petroleum populations can be related to lateral filling of the field from two source basins and a more pervasive subsequent episode in reservoir biodegradation petroleum maturity gradients within the field were detected using conventional biomarker gc ms methods on saturated hydrocarbon fractions the degree of biodegradation was monitored by quantitative gc of n alkanes in whole oil samples using a squalane internal standard the observed compositional differences in the gullfaks petroleum column are consistent with diffusion being the primary mixing process thermal convection being eliminated on both compositional and modeling grounds compositional differences between core extracts and dst samples from the same intervals suggest that fractionation of petroleum might occur during testing and that interpretation of reservoir petroleum columns from mixed sample sets should be treated cautiously

estimates of 1 hz maximum acceleration in bulgaria for seismic risk reduction purposes abstract the regional seismic hazard in bulgaria is assessed using a deterministic approach which computes synthetic seismograms at a set of grid points the input for this computation is represented by available source and structural models a set of simplified structural models is proposed for bulgaria and assigned to a number of regional polygons the set of seismic sources are parametrized using the knowledge about the focal mechanisms the seismogenic areas and the regional seismicity a map of the maximum ground acceleration amax is chosen to represent the shakeability and the seismic hazard the most dangerous area of the country is confirmed as southwestern bulgaria

rupture zones in the aegean region rupture zones of strong shallow earthquakes can be investigated by field observations of surface fault traces sf accurate location of spatial clusters of aftershocks or other small earthquakes cl reliable fault plane solutions fp and information on the spatial distribution of sites with high i viii macroseismic intensities ma the validity of these four techniques was successfully tested by comparing the results of their application to several cases of strong shallow earthquakes these techniques were then applied to spatially define the rupture zones of 150 strong m 6 0 shallow earthquakes in the aegean and surrounding area the type of faulting was determined for all these zones by the use of reliable fault plane solutions which are available for this area the orientation of most of these rupture fault zones is in good agreement with the presently acting stress field with some exceptions which are attributed to the rupture of pre existing faults the tectonic implications of these zones are discussed 1999 elsevier science b v all rights reserved

earthquake scenario based tsunami wave heights in the eastern mediterranean and connected seas we identified a set of tsunami scenario input parameters in a 0 5 0 5 uniformly gridded area in the eastern mediterranean aegean both for shallow and intermediate depth earthquakes and black seas only shallow earthquakes and calculated tsunami scenarios using the swan joint research centre swan jrc code mader 2004 annunziato 2007 with 2 arcmin resolution bathymetry data for the range of 6 5 mwmax with an mw increment of 0 1 at each grid in order to realize a comprehensive analysis of tsunami wave heights from earthquakes originating in the region we defined characteristic earthquake source parameters from a compiled set of sources such as existing moment tensor catalogues and various reference studies together with the mwmax assigned in the literature where possible results from 2 415 scenarios show that in the eastern mediterranean and its connected seas aegean and black sea shallow earthquakes with mw 6 5 may result in coastal wave heights of 0 5 m whereas the same wave height would be expected only from intermediate depth earthquakes with mw 7 0 the distribution of maximum wave heights calculated indicate that tsunami wave heights up to 1 m could be expected in the northern aegean whereas in the black sea cyprus levantine coasts northern libya eastern sicily southern italy and western greece up to 3 m wave height could be possible crete the southern aegean and the area between northeast libya and alexandria egypt is prone to maximum tsunami wave heights of 3 m considering that calculations are performed at a minimum bathymetry depth of 20 m these wave heights may according to green s law be amplified by a factor of 2 at the coastline the study can provide a basis for detailed tsunami hazard studies in the region

interannual variability of the eastward current in the western south china sea associated with the summer asian monsoon the interannual variability of the eastward current in the western south china sea scs during the summer of 1993 2012 is examined with satellite altimeter data and regional ocean modeling system roms model output it is found that the meridional location of the eastward current displays apparent interannual variability the core of the eastward current shifts between 10 7 n and 17 6 n with a standard deviation of 1 6 results from sverdrup theory and roms experiments demonstrate a close dynamic linkage between the north south migration of the eastward current and the scs summer monsoon anomaly on the interannual time scale when the summer monsoon has southwesterly northeasterly anomaly the eastward current moves southward northward with the southward northward shift of the eastward current the summer cold filament in the scs moves southward northward as well

seismological and gps evidence for the aegean anatolia interaction seismological and gps data are used in order to examine the seismotectonic setting and the plate motions in the eastern mediterranean the main objective is to reevaluate the recently proposed idea of a single anatolia aegean microplate which performs a rigid body rotation about an euler pole located in northern africa both data sets show a more complicated setting south of the north anatolia fault naf the plate motion of anatolia relative to europe can be adequately described by a simple rigid body rotation with a dominant east west component and an average velocity of 22mm yr however both types of data show a significant increase of the deformation velocities in the aegean area 30 35mm yr and exhibit a much larger n s component up to 20mm yr than the one predicted from rigid body rotation this deformation pattern is more consistent with models which consider the aegean as a separate microplate

analysis of petroleum fractions by tlc fid applications to petroleum reservoir description abstract thin layer chromatography and flame ionization detection iatroscan tlc fid offers a rapid and accurate method for quantifying saturated and aromatic hydrocarbons and resin asphaltene fractions in solvent extracts of petroleum source rocks reservoir rocks and crude oils while the instrument is superficially simple special precautions need to be taken in calibration and parameter setting due to complexities arising from the operational characteristics of the detector system nevertheless the technique offers superior speed and precision to conventional mplc analysis of petroleum fractions this paper describes the choice of operational parameters provides comparison with the traditional group type analysis technique mplc and presents some geochemical applications

synthetic seismogram based deterministic seismic zoning for the hungarian part of the pannonian basin deterministic seismic hazard computations have been done for the hungarian part of the pannonian basin within the framework of a cooperation of five countries synthetic seismograms have been computed by the modal summation method up to 1 hz in order to determine the expected maximum displacement dmax velocity vmax and the design ground acceleration dga on a 0 2 0 2 grid dga values have been estimated from the seismograms by using the standard this investigation justified the suspicion that a considerable part of seismic hazard of hungary comes from the seismogenic zones of the neighbouring countries the highest dga reaches a value as high as 0 14 g which corresponds approximately to the viii intensity degree in the msk 64 scale among the six largest cities of hungary three art particularly subject to a high seismic risk greater acceleration values have been found for the cities of szeged and debrecen than was expected before this study

tomography of the crust and upper mantle in southeast europe compressional velocity structure of the crust and the upper mantle in southeastern europe broader aegean area is studied by inverting residuals of the first p arrivals from earthquakes in this region 16 e 31 e 34 n 43 n the data used are from regional events recorded by the permanent network of stations during the period 1971 1987 enriched with data from experiments with portable seismographs in four regions of this broad area this study confirms the strong variations of crustal thickness in this area as well as the subduction of the eastern mediterranean lithosphere under the southern aegean and gives further detailed information on the crustal and upper mantle structure of the area important new information is the existence of a low velocity crustal layer in western greece and albania and that the velocity anomaly in the mantle under the southern aegean extends much farther and deeper to the northeast than the benioff zone of the intermediate depth earthquakes indicates furthermore evidence is presented about the possible existence of older subduction in the northern aegean and about the influence of the tectonic regime on the velocity field

rayleigh wave group velocity tomography in the aegean area data from a large scale experiment which took place in greece during the period january july 1997 have been used to investigate the structure of the aegean area using surface waves during this experiment 30 seismic broadband instruments were deployed throughout the whole greek area additional data during the period 1996 2000 from other temporary networks have been included in the dataset one hundred eighty five events with magnitudes 4 0vmwv5 5 recorded by these stations have been collected and processed the individual dispersion curves of the group velocity of rayleigh waves for each source station path have been calculated producing more than 700 paths covering the studied region these curves have been used to determine rayleigh group velocity maps using a 2d tomography method on the basis of a regionalization of the dispersion measurements local averaged dispersion curves have been obtained and non linearly inverted to obtain models of shear wave velocity versus depth since the dispersion curves in the period range 5 svtv30 s are mostly affected by the crustal structure the model velocities are estimated down to a depth of approximately 35 45 km the results from the non linear hedhehog inversion as applied to a few local dispersion curves show a crustal thickness of approximately 32 km for the northern aegean sea and a relatively thin crust of approximately 22 24 km for the southern aegean sea d 2002 elsevier science b v all rights reserved

seismic zoning of slovenia based on deterministic hazard computations seismic hazard of the territory of slovenia is estimated using a deterministic approach based on the computation of complete synthetic seismograms the input data are the catalogues of earthquakes and fault plane solutions for slovenia and surrounding regions structural models are defined based on available seismological and geophysical information but are mainly constrained by surface wave dispersion and 3 d tomographic modelling of the upper crust seismogenic zones are delineated considering geotectonic characteristics fault plane solutions and distribution of earthquake hypocentres outside slovenia seismogenic zones are extended up to distances from which they can considerably influence seismic hazard estimates synthetic seismograms are computed using the receiver structure along the entire path by normal mode summation up to 1 hz for receiver sites on a 0 2 0 2 degrees grid and scaled to the magnitude of the earthquake allowing for spectral falloff at each site the maximum value of horizontal velocity horizontal displacement and design ground acceleration are considered as hazard parameter the highest values are obtained for western slovenia where the hazard is controlled by the strongest earthquake in the catalogue the idrija event of march 26 1511

quantitative fluorescence techniques for detecting residual oils and reconstructing hydrocarbon charge history abstract two new fluorescence techniques quantitative grain fluorescence qgf and quantitative grain fluorescence on extract qgf e can detect palaeo oil zones and current residual oil zones in petroleum wells respectively qgf and qgf e measure the fluorescence emission spectra of trace fluorescence from reservoir grains and their extracts qgf is measured on dry disaggregated reservoir grains after a cleaning procedure involving solvent hydrogen peroxide and acid whereas qgf e is measured on the solvent extract from the qgf cleaned grains palaeo oil zones have distinct qgf spectra with spectral peaks between 375 and 475 nm and elevated fluorescence intensities compared with spectra for rocks that have always been water saturated current and residual oil zones have distinct qgf e spectra with spectral peaks at around 370 nm and elevated qgf e intensities compared with that for current water zones both qgf and qgf e responses increase upwards from the palaeo oil water and residual oil water contacts respectively an oil producing well from timor sea nw australia was investigated in detail using the qgf and qgf e techniques to illustrate how they can be used to reconstruct hydrocarbon migration history

northwestern turkey earthquakes and the crustal structure inferred from surface waves observed in western greece records of several earthquakes occurring in turkey in 1999 obtained at broadband seismic stations in western greece have been used to study the dispersion of surface waves mainly love waves the observed group velocity dispersion curves have been inverted into horizontally layered models of the earth s crust by a modified method of the single parameter variation as compared with a previous model for the territory of greece the dispersion data require significantly lower velocities in the uppermost crust and smaller crustal thickness in particular the resulting model displays s wave velocities between 1 3 and 2 4 km sec in the upper 2 km and a crustal thickness of about 33 km manuscript received 31 july 2000

time independent and time dependent seismic hazard in greece based on seismogenic sources abstract an improved procedure is followed to assess time independent andtime dependent hazard for 144 broad sites cities towns villages of greece in termsof expected macroseismic intensities at each one of these sites in this procedureseveral new results are taken into account source parameters based on new researchwork on seismicity and on other relative information new regionalization and im proved seismicity data parameters and anisotropic radiation at the seismic source anew relation for the attenuation of macroseismic intensities and the effect of localconditions site effects on the strong ground motion analytic relations and tables determined by this procedure permit the reliableassessment of time independent hazard in terms of macroseismic intensity in mmscale peak horizontal ground acceleration and velocity at each one of these 144sites and at any probability level time dependent hazard has been also assessed for these 144 broad sites in greece in terms of the probability for the occurrence of strong ground motion with macro seismic intensity i vii in mm scale at each one of these sites during the period1996 2010 comparison of the assessed time dependent hazard with observed ma croseismic intensities of the period 1950 1995 indicates that the time dependentmodel gives very reasonable results introduction

active tectonics of the aegean region the aegean sea and its surrounding regions comprise one of the most rapidly deforming parts of the alpine himalayan mountain belt though the deformation of the belt as a whole is related to thc northward move ment of africa arabia and india relative to eurasia the tectonics of the aegean region itself is dominated by strike slip and extensional motions the actively deforming part of the aegean region is not large about 700 x 700 km2 compared with that in asia yet it has had an influence on our views of continental tectonics disproportionate to its size and comparable perhaps only to tibet fundamental contributions from the aegean have been made to many topics including