Eleftheria Papadimitriou

Eleftheria Papadimitriou
Aristotle University of Thessaloniki | AUTH · Department of Geophysics (GGP)

Ph D

About

314
Publications
60,782
Reads
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4,625
Citations
Citations since 2017
103 Research Items
1876 Citations
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Introduction
Eleftheria Papadimitriou currently works at the Department of Geophysics (GGP), Aristotle University of Thessaloniki. Eleftheria does research in Earthquake Seismology. Their most recent publication is 'Relocation of recent seismicity and seismotectonic properties in the Gulf of Corinth (Greece).'
Additional affiliations
May 1998 - September 1998
Columbia University
Position
  • Sabbatical
Description
  • Sabbatical
October 1988 - April 1989
Paris Diderot University
Position
  • Sabbatical
June 1982 - present
Aristotle University of Thessaloniki
Position
  • Professor
Description
  • Professor of Seismology
Education
November 1981 - December 1984
Aristotle University of Thessaloniki
Field of study
  • Seismology
October 1976 - March 1981

Publications

Publications (314)
Article
Full-text available
The intense 2020–2021 seismic crisis in Corinth gulf, Greece, comprising several hundreds of small earthquakes (maximum magnitude Mw = 5.4 on 17 February 2021) is investigated. The spatial and temporal evolution of the seismicity implied the activation of multiple secondary fault segments. To decipher the geometry of the activated structures, we en...
Article
Full-text available
Strong crustal earthquakes in Greece are typically followed by aftershocks, the properties of which are important factors in seismic hazard assessment. In order to examine the properties of earthquake sequences, we prepared an earthquake catalog comprising aftershock sequences with mainshocks of Mw ≥ 5.5 from 1995 to 2021. Regional aftershock param...
Article
Full-text available
Seismic temporal properties constitute a fundamental component in developing probabilistic models for earthquake occurrence in a specific area. Earthquake occurrence is neither periodic nor completely random but often accrues into bursts in both short- and long-term time scales, and involves a complex summation of triggered and independent events (...
Article
The noticeable increase in the occurrence rate of the great (M≥8.0) global earthquakes since 2004, provokes the extensive investigation of non-stationarity in their temporal distribution. The reliable evaluation of their expected occurrence rates is a highly demanding aspect due to the co-existence of scarce long interevent times (extreme events) a...
Article
Full-text available
The investigation of short-term earthquake-clustering features is made feasible through the application of a purely stochastic Epidemic-Type Aftershock Sequence (ETAS) model. The learning period that is used for the estimation of the parameters is composed by earthquakes with M ≥ 2.6 that occurred between January 2008 and May 2017. The model predic...
Article
On 20 July 2017 (22:31:10 UTC), an Mw6.6 earthquake took place offshore Kos Island, in the southeastern (SE) Aegean Sea, producing severe damage and loss of life in the city of Kos and several smaller cities and villages both in Kos Island (Greece) and in the Bodrum peninsula (Turkey). All available seismological data until the end of October 2017...
Technical Report
Full-text available
Technical report with multiple authors (please refer to pdf), edited by Anastasios Sextos, Basil Margaris and Nikolaos Klimis. Coordinated by the Hellenic Association of Earthquake Engineering, the Institute of Engineering Seismology and Earthquake Engineering (ITSAK-EPPO) and Democritus University of Thrace with the collaboration of Aristotle Univ...
Article
Full-text available
The efficiency of earthquake clustering investigation is improved as we gain access to larger datasets due to the increase of earthquake detectability. We aim to demonstrate the robustness of a new clustering method, MAP-DBSCAN, and to present a comprehensive analysis of the clustering properties in three major seismic zones of Greece during 2012–2...
Conference Paper
Full-text available
The physics behind aftershock generation remain a critical issue in the scientific community with different underlying mechanisms proposed to interpret the seismological observations. The spatial distribution of aftershocks has been traditionally used to constrain the dimensions of the ruptured fault after the mainshock occurrence, whereas it has b...
Article
Full-text available
Physics-based broadband ground-motion simulations are generated for the strong mainshocks that occurred in the region of the Central Ionian Islands, on 26th January 2014 in Kefalonia (Mw6.1) and 17th November 2015 in Lefkas (Mw6.5). The study area is associated with frequent strong earthquakes both in the historical and instrumental era. During the...
Article
A physics-based earthquake simulation algorithm for modeling the long-term spatiotemporal process of strong (M ≥ 6.0) earthquakes in Corinth Gulf area, Greece, is employed and its performance is explored. The underlying physical model includes the rate- and state-dependent frictional formulation, along with the slow tectonic loading and coseismic s...
Article
Full-text available
On 3 March 2021, the Mw6.3 Tyrnavos earthquake shook much of the Thessalia region, leading to extensive damage in many small towns and villages in the activated area. The first main shock was followed in the next day, on 4th of March 2021, by an “equivalent” main shock with Mw6.0 in the adjacent fault segment. These are the largest earthquakes to s...
Article
In the original version of this article, the reference list for the kinematic source inversion algorithm provided us by Yuji Yagi is incomplete.
Article
The Canonical Correlation Analysis (CCA) estimates the correlation between two vector variables by maximizing the correlation of linear combinations of their respective components. Here, the CCA is used to find correlation patterns in the last five successive, per pairs, earthquakes (M ≥ 4.0) preceding 271 main shocks (M ≥ 5.5) that occurred in the...
Presentation
Full-text available
The central Ionian Islands area accommodates remarkable seismic activity with frequent strong (M>6.0) earthquake occurrence and continuous microseismicity. The dominant seismotectonic characteristic is the Kefalonia Transform Fault Zone (KTFZ), a dextral transform active boundary between oceanic subduction and continental collision, running along t...
Article
Short-term earthquake clustering properties in the Eastern Aegean Sea (Greece) area investigated through the application of an epidemic type stochastic model (Epidemic Type Earthquake Sequence; ETES). The computations are performed in an earthquake catalog covering the period 2008 to 2020 and including 2332 events with a completeness threshold of M...
Article
The 30 October 2020, M w 7.0 Samos mainshock took place in the offshore north of Samos Island in eastern Aegean area, previously struck in 1904 with a comparable magnitude earthquake offshore the southern coastline. The investigation of the aftershock seismicity evolution and the properties of the activated fault network was accomplished with after...
Chapter
The study of earthquake clustering provides crucial information on earthquake dynamics, like the evolution of mainshock‐aftershock sequences and swarms. This chapter discusses the feature of multiple embedded arrival rates that can distinguish seismic clusters from background seismicity and even reveal their structure, generalized into the idea of...
Chapter
In long‐term regional models, which are known as self‐correcting models, the occurrence of an event has an inhibitory effect and the probability of new events appearing decreases. The Stress Release Model (SRM) belongs to the category of self‐correcting models. This chapter presents a thorough review on the applications of the SRMs, discusses their...
Article
Full-text available
Following the M7.0 earthquake that struck the Greek island of Samos and Turkey's western coast, causing extensive damage and casualties, we combined existing knowledge geodatabases concerning historical seismicity and rupture zones with seismological and geodetic measurements as well as with modelling and in situ observations, to provide an assessm...
Article
Full-text available
The complexity of seismogenesis requires the development of stochastic models, the application of which aims to improve our understanding on the seismic process and the associated underlying mechanisms. Seismogenesis in the Corinth Gulf (Greece) is modeled through a Constrained-Memory Stress Release Model (CM-SRM), which combines the gradual increa...
Article
The recurrence time of large earthquakes above a predefined magnitude threshold on specific faults or fault segments is one of the key parameters for the development of long-term Earthquake Rupture Forecast (ERF) models. Observational data of successive large earthquakes per fault segment are often limited and thus inadequate for the construction o...
Article
Investigation of temporal b-values variations during the last decade is attempted in central Ionian Islands (Greece), the most seismically active area in the Mediterranean area. The high quality catalogue used, starting in 2008 with the completeness magnitude M c 2.8 comprises data from the aftershock sequences of the 2014 Cephalonia doublet (M w 6...
Article
The spatiotemporal evolution of seismicity of an accurately relocated earthquake catalog in the central Ionian Islands, Greece, is explored, by the systematic identification of the earthquake clusters over the period September 2016–December 2019. Manual waveform phase picking was the input for the relocation leading to 13,632 earthquakes that compo...
Article
Full-text available
The recurrence time, T r , of strong earthquakes above a predefined magnitude threshold on specific faults or fault segments is an important parameter, that could be used as an input in the development of long-term fault-based Earthquake Rupture Forecasts (ERF). The amount of observational recurrence time data per segment is often limited, due to t...
Technical Report
Full-text available
On 30 October 2020, an M 7.0 earthquake occurred north of Samos Island. The fault rupture caused sudden lowering of the seafloor, which produced a tsunami that mainly impacted nearby Samos Island as well as a series of Anatolian cities along the coast of Seferihisar Bay, with maximum runup and inundation lengths of about 3.8 m and 2500 m, resulting...
Article
An Mw 6.8 earthquake occurred on October 25, 2018, 35 km offshore from the southwest coastlines of Zakynthos Island. The aftershock sequence appeared remarkably productive with six aftershocks of M ≥ 5.0 in the first month and tens of aftershocks with M ≥ 4.0 during the study period. The GCMT solution for the main shock suggests a very low angle pl...
Article
Full-text available
The investigation of earthquake recurrence networks that were constructed from two aftershock sequences in Greece, is performed, aiming to detect whether the structure of networks became distinct (non-random) before the occurrence of either the main shock or a major (strong) aftershock. The network nodes are the time series observations, which are...
Article
Full-text available
A quite energetic seismic excitation consisting of one main and three additional distinctive earthquake clusters that occurred in the transition area between the Kefalonia Transform Fault Zone (KTFZ) and the continental collision between the Adriatic and Aegean microplates is thoroughly studied after the high-precision aftershocks' relocation. The...
Article
Full-text available
Clustering features of crustal seismicity for the period from 2008 up to 2018 in Greece in both space and time are investigated by means of the epidemic type aftershock sequence model. With a completeness threshold of mc = 3.5, the data set includes 8258 events, with 19 of them of Mw ≥ 6.0, encouraging the detailed analysis of the short–term cluste...
Preprint
A quite energetic seismic excitation consisting of one main and additional three distinctive earthquake clusters that occurred in the transition area between the Kefalonia Transform Fault Zone (KTFZ) and the continental collision between Adriatic and Aegean microplates, is thoroughly studied after high–precision aftershocks’ relocation. The activat...
Poster
Full-text available
Earthquake clustering investigation reveals characteristics of the earthquake dynamics, like the evolution of main shock-aftershock sequences and swarms. For such investigation we applied a method based on a bivariate stochastic point process, the Markovian arrival process (MAP) [Neuts, 1979], (Nt,Jt)t∈ℜ+, whose intensity function, λt, is modulated...
Technical Report
Full-text available
Earthquake predictability has been the topic of debate within the seismological community. The interest in the topic is understandable, since it stems both from our present inability to predict earthquakes and from the potentially great value that prediction could have for society. Our difficulty in predicting earthquakes is partly due to the inher...
Article
The Florina basin (NW Greece) embodies sources of natural CO2 emissions, which are aligned parallel to the NE-SW striking regional major normal faults. The study area is characterized by low to moderate seismicity, as historical information and instrumental data reveal. During February 2013 to January 2014 an outburst of seismic activity emerged, c...
Article
The complex turbulent dynamics of seismogenesis in the area of Greece is investigated, by applying an alternative approach based on renewal theory, specifically the Renewal Aging Algorithm, to two earthquake interevent (waiting) time series. The data sets were extracted from the regional earthquake catalogue compiled from the Geophysics Department,...
Article
Earthquake clustering in the area of Central Ionian Islands (Greece) is statistically modelled by means of the Epidemic Type Aftershock Sequence (ETAS) branching model, which is the most popular among the short-term earthquake clustering models. It is based upon the assumption that an earthquake is not fully related to any other one in particular,...
Article
Prevailing patterns of seismicity dynamics, like the evolution of main shock-aftershock sequences and swarms, along with periods of seismic quiescence, are explored through the temporal analysis of the earthquake clustering in the area of Corinth Gulf, Greece. The clusters are unveiled by the implementation of a new algorithm, whose robustness is v...
Article
The complex turbulent dynamics of seismogenesis in the area of Greece is investigated, by applying an alternative approach based on renewal theory, specifically the Renewal Aging Algorithm, to two earth- quake interevent (waiting) time series. The data sets were extracted from the regional earthquake cata- logue compiled from the Geophysics Departm...
Article
The complex turbulent dynamics of seismogenesis in the area of Greece is investigated, by applying an alternative approach based on renewal theory, specifically the Renewal Aging Algorithm, to two earth- quake interevent (waiting) time series. The data sets were extracted from the regional earthquake cata- logue compiled from the Geophysics Departm...
Article
Full-text available
Seismic hazard assessment is one of the main targets of seismological research, aiming to contribute to reducing the catastrophic consequences of strong earthquakes (e.g., M>6.0). From the early stage of seismological research, both purely seismological and statistical methods were adopted for seismic hazard assessment. An approach towards this tar...
Article
Change point analysis is performed on the seismicity in Gulf of Corinth (Greece), an extensional graben which constitutes one of the most seismically active areas in Greece. Seismicity appears intense and strongly clustered and therefore analysis on mean and variance is appropriate. Sample autocorrelation function of the data is non-zero even for b...
Article
A short overview on superstatistics applied in various complex systems is firstly provided by. In particular, roughly outlining are given concerning the methodology, including the deduction of superstatistical parameters from time series, the development of superstatistical dynamical models and the characterization of the complex system as a specia...
Article
Full-text available
A growing interest appears among public authorities and society in accurate and nearly real time aftershock forecasting to manage and mitigate post-seismic risk. Existing methods for aftershock forecasting are strongly affected by the incompleteness of the instrumental datasets available soon after the main shock occurrence. The deficit of observed...
Poster
Full-text available
For the application of the Renewal Aging Algorithm time scales corresponding to short– and intermediate– term forecasting were considered, namely 2–3 weeks to the number of years corresponding to the maximum Waiting Time for each data set. The results of the statistical analysis reveal transitions from time–homogeneous Poisson to time–homogeneous n...
Article
Full-text available
The majority of strong earthquakes takes place a few hours after a mainshock, promoting the interest for a real time post-seismic forecasting, which is, however, very inefficient because of the incompleteness of available catalogs. Here we present a novel method that uses, as only information, the ground velocity recorded during the first 30 min af...
Conference Paper
Full-text available
Studying the clustering features of seismicity both in space and time is one of the most important factors of earthquake forecasting. Earthquake occurrence exhibits short and long term clustering (Kagan and Jackson, 1991; Dieterich, 1994) due to the physical processes related with seismogenesis (e.g. fault interactions and heterogeneity). Focusing...
Article
Full-text available
The monitoring of complex earthquake networks that are formed from Greek seismicity based on the evolution of their measures, such as degree centrality, characteristic path length, and clustering coefficient is performed, aiming to identify whether and when these networks exhibit distinct evolution between main shocks. As network nodes, the 17 seis...
Article
The complexity of seismogenesis tantalizes the scientific community for understanding the earthquake process and its underlying mechanisms and consequently, precise earthquake forecasting, although a realistic target, is yet far from being a practice. Therefore, seismic hazard assessment studies are focused on estimating the probabilities of earthq...
Article
The non-trivial properties of the small-world and scale-free structure are inves-tigated in earthquake networks that are formed from the seismicity taking place in Greece and adjacent area. The nodes of these networks are either well-defined seismic zones or square cells comprised in a normal grid superimposed onto the study area. The network conne...
Article
The Lefkada Island, central Ionian islands, Greece, deforms in response to rapid dextral strike-slip movement of the Cephalonia Transform Fault Zone accounted to 2-3 cm/yr. Historical and instrumental earthquakes had a major impact on the coastal landscape, as they had caused nearshore landslides, rockfalls, tsunami-induced flooding, and several ce...
Chapter
This chapter give insights into the genesis of strong earthquakes by estimating important indicators of the underlying "hidden" process which is considered to be a semi‐Markov chain (SMC). It focuses our interest on the discrete‐time hidden semi‐Markov model (HSMM). The chapter analyses the important indicators related to the levels of the stress f...
Chapter
Different reliability indicators have been introduced for both repairable and non‐repairable systems, including mean failure times, hazard rates and availability function. This chapter explicitly deals with an important reliability indicator for hidden Markov models: the failure occurrence rate (ROCOF). The ROCOF can decrease, increase or can even...
Chapter
Earthquake generation is the result of the accumulation and release of strain on a given fault or fault segment. External stress produces deformation, which under elastic conditions leads eventually to failure. The assessment of the earthquake forecasts based on the calculation of stress changes is mainly performed with the available earthquake cat...
Chapter
Hidden Markov models (HMMs) are used to describe random phenomena that are governed by inaccessible, "hidden" mechanisms. This chapter focuses on HMMs with finite state and observation spaces. It briefly introduces the HMMs and also focuses on a real‐life application in seismology. A discrete‐time hidden Markov process or a HMM is a stochastic proc...
Chapter
Markov chains are the simplest stochastic models that can be used to describe time‐varying, random phenomena. This chapter presents the comparison of hidden Markov models (HMMs) and hidden Markov renewal models (HMRMs) in a Markov context and a Markov renewal context, and determines whether there are any differences in terms of their transition pro...
Article
From Random Sequences to Stochastic Processes Presents a comprehensive course on the theory of stochastic processes Includes a wealth of exercises with detailed solutions Provides numerous examples in reliability, information theory, production, risk, and other areas Builds a bridge between regular textbooks on probability theory and advanced monog...
Article
The Markovian Arrival Process (MAP) is applied as a candidate model to describe the time-varying earthquake activity in Corinth Gulf, Greece. To the best of our knowledge, this is the first attempt to study the earthquake temporal evolution with the specific class of MAPs. A complete catalogue is used for the earthquake temporal distribution invest...
Article
Full-text available
The determination of strong earthquakes’ recurrence time above a predefined magnitude, associated with specific fault segments, is an important component of seismic hazard assessment. The occurrence of these earthquakes is neither periodic nor completely random but often clustered in time. This fact in connection with their limited number, due to s...
Article
Full-text available
The original version of this article unfortunately contains mistakes. The mistakes and corrections are described in the following list: 1) Author names were incorrectly presented. The correct format is shown above as well as in the below affiliation section.
Article
The introduction of stochastic earthquake recurrence times in feature vector is attempted for the identification of asperities in the area of Hokkaido, Japan, using machine learning algorithms. Seismicity attributes, feature selection algorithms, and class balancing techniques were used. The stochastic attributes of earthquake density in space, b-v...
Article
Full-text available
Eastern Macedonia and Thrace are characterized by moderate seismicity compared to the adjacent North Aegean area, as it is derived from both historical information and instrumental records. The known strong (M>6.5) historical earthquakes that occurred during the past three centuries, however, have caused appreciable casualties and for this reason t...