The 14 August 2003 Lefkada Island (Greece) earthquake: Focal mechanisms of the mainshock and of the aftershock sequence

Benetatos, Christoforos; Kiratzi, Anastasia; Roumelioti, Zafeiria; Stavrakakis, G.; Δρακάτος, Γ.; Latoussakis, I.

doi:10.1007/s10950-005-7092-1

Cited by 64 publications

(41 citation statements)

References 31 publications

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“…Dextral strike-slip faults in the Cephalonia area and the North Aegean Trough (Galanopoulos, 1967;McKenzie, 1972) are some other examples of the important contribution of fault plane solutions. For the study area, reliable fault plane solutions have been calculated using different methods, such as P wave polarities from first motions for both long-period teleseismic records (Papazachos, 1961;Delibasis, 1968;Ritsema, 1974;McKenzie, 1972McKenzie, , 1978Anderson and Jackson, 1987;Kiratzi and Louvari, 2003) and local events (Hatzfeld et al, 1989;Hatzidimitriou et al, 1991), as well as body-wave inversion or teleseismic waveform modelling Langston, 1989, 1991;Taymaz et al, 1990Taymaz et al, , 1991Papadimitriou, 1993;Yilmazturk and Burton, 1999;Benetatos et al, 2004;Bene- , 2007). In the last 15 years, reliable fault plane solutions have been calculated by the use of high-quality broadband teleseismic data from international digital networks for strong earthquakes, including earthquakes of magnitude less than 5.5 (e.g.…”

Section: Fault Plane Solution Informationmentioning

confidence: 99%

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A detailed seismic zonation model for shallow earthquakes in the broader Aegean area

Vamvakaris

Papazachos

Papaioannou

et al. 2016

Nat. Hazards Earth Syst. Sci.

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Abstract. In the present work we propose a new seismic zonation model of area type sources for the broader Aegean area, which can be readily used for seismic hazard assessment. The definition of this model is based not only on seismicity information but incorporates all available seismotectonic and neotectonic information for the study area, in an attempt to define zones which show not only a rather homogeneous seismicity release but also exhibit similar active faulting characteristics. For this reason, all available seismological information such as fault plane solutions and the corresponding kinematic axes have been incorporated in the analysis, as well as information about active tectonics, such as seismic and active faults. Moreover, various morphotectonic features (e.g. relief, coastline) were also considered. Finally, a revised seismic catalogue is employed and earthquake epicentres since historical times (550 BC-2008) are employed, in order to define areas of common seismotectonic characteristics, that could constitute a discrete seismic zone. A new revised model of 113 earthquake seismic zones of shallow earthquakes for the broader Aegean area is finally proposed. Using the proposed zonation model, a detailed study is performed for the catalogue completeness for the recent instrumental period.Using the defined completeness information, seismicity parameters (such as G-R values) for the 113 new seismic zones have been calculated, and their spatial distribution was also examined. The spatial variation of the obtained b values shows an excellent correlation with the geotectonic setting in the area, in good agreement with previous studies. Moreover, a quantitative estimation of seismicity is performed in terms of the mean return period, T m , of large (M ≥ 6.0) earthquakes, as well as the most frequent maximum magnitude, M t , for a typical time period (T = 50 yr), revealing significant spatial variations of seismicity levels within the study area. The new proposed seismic zonation model and its parameters can be readily employed for seismic hazard assessment for the broader Aegean area.

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Section: Fault Plane Solution Informationmentioning

confidence: 99%

“…In the last 15 years, reliable fault plane solutions have been calculated by the use of high-quality broadband teleseismic data from international digital networks for strong earthquakes, including earthquakes of magnitude less than 5.5 (e.g. Louvari, 2000;Benetatos et al, 2005;Roumelioti et al, 2011).…”

Section: Fault Plane Solution Informationmentioning

confidence: 99%

A detailed seismic zonation model for shallow earthquakes in the broader Aegean area

Vamvakaris

Papazachos

Papaioannou

et al. 2016

Nat. Hazards Earth Syst. Sci.

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“…Located in the same geodynamic regime and not far from Cephalonia, Lefkada Island was struck by a Mw6.2 earthquake on August 14 2003 in the same epicentral area with the recent 2015 event (Figure 2), also demonstrating similar aftershock clustering pattern (Benetatos et al, 2005;Papadimitriou et al, 2006) implying rupturing of the same fault zone. The earthquake was followed by extensive secondary ground deformation, such as slope failures, liquefaction phenomena, ground fissures, etc.…”

Section: Introductionmentioning

confidence: 85%

Earthquake Triggering Effect Scenarios During the 2014 Sequence in Cephalonia and 2015 Earthquake in Lefkada Broader Areas, Ionian Sea, Greece

et al. 2017

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“…According to Benetatos et al (2007), the slip history of Lefkas earthquake exhibited significant complexity with the seismic energy release occurring in slip patches located along both the LS and CS segments of the CTFZ (Fig. 1) (Benetatos et al 2005;Zahradnik et al 2005;Benetatos et al 2007). For the purpose of this study we considered the contribution only of the LS, both for the simulation of the 14 August 2003 earthquake and of a magnitude M7 future event.…”

Section: The Finite Source Modelmentioning

confidence: 99%

Seismic damage scenarios in Lefkas old town (W. Greece)

Kassaras

Kalantoni

Benetatos

et al. 2015

Bull Earthquake Eng

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Damage scenarios were developed for the Lefkada old town (LOT). LOT is the historical center of the capital of Lefkas Island, part of the Ionian Islands, one of the most seismically prone areas within the Mediterranean region that suffered numerous devastating earthquakes in the past. The most recent strong earthquake with Mw = 6.2 occurred on 14 August 2003 at a distance of about 13 km from LOT. A peak ground acceleration (PGA) equal to 0.42 g was recorded in LOT, one of the highest values ever recorded in Greece. Nevertheless, the 2003 event produced limited damage to the buildings of LOT, comprising traditional construction practices of architectural significance and a high seismic behaviour. Towards the development of damage scenarios the following tasks were performed: (a) buildings inventory and vulnerability indices determination using EMS-98 along with behaviour modification scores, (b) subsoil response functions and 1D viscoelastic models calculation using microtremors and (c) stochastic PGA simulation using site amplification deduced from the subsoil response functions. Two scenarios were developed considering the sources of the 2003 M6.2 earthquake and a future M7 event, located at the same fault. The discrete damage probability was resolved by formulating a beta distribution of an average damage grade related to the vulnerability index and the simulated PGA through empirical equations. The deduced models are comparable with the observed 2003 damage distribution, hence they are likely useful for preparing future emergency plans. In the aftermath, although further investigation is needed to explain outliers, the implementation of the followed methodology into an automated procedure for near real time shake and damage maps generation in case of a seismic crisis is highly recommended. The work herein, with proper adaptations, is potentially fairly applicable for other towns and regions in Europe.

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The 14 August 2003 Lefkada Island (Greece) earthquake: Focal mechanisms of the mainshock and of the aftershock sequence

Cited by 64 publications

References 31 publications

A detailed seismic zonation model for shallow earthquakes in the broader Aegean area

A detailed seismic zonation model for shallow earthquakes in the broader Aegean area

Earthquake Triggering Effect Scenarios During the 2014 Sequence in Cephalonia and 2015 Earthquake in Lefkada Broader Areas, Ionian Sea, Greece

Seismic damage scenarios in Lefkas old town (W. Greece)

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