Empirical Peak Ground-Motion Predictive Relations for Shallow Earthquakes in Greece

Skarlatoudis, A. A.; Papazachos, C. B.; Margaris, Basil; Theodulidis, N.; Papaioannou, Ch.; Kalogeras, I.; Scordilis, E. M.; Karakostas, V.

doi:10.1785/0120030016

Cited by 90 publications

(83 citation statements)

References 45 publications

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“…The estimation of the seismic intensity in Karababa and Pomonis (2011) is based on the attenuation relationship proposed by Skarlatoudis et al (2003) for the Greek territory. As already noted, the parameterless ψ intensity has to be converted to PGA using empirical relationships (such as Equation 11), so the entire process is subject to significant uncertainty.…”

Section: Pilot Seismic Loss Scenariomentioning

confidence: 99%

Fragility Curves and Loss Estimation for Traditional Timber-Framed Masonry Buildings in Lefkas, Greece

Kouris

Kappos

2015

Computational Methods in Applied Sciences

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract The 2003 earthquake in the Greek island of Lefkas, has revived the interest for the local anti-seismic technique based on the use of timber-framed masonry, whose adequate performance during the earthquake revealed the merits of this rather sophisticated, albeit traditional, construction. A key feature of the Lefkas structures is their dual structural system. The secondary system is activated once the ground storey stone masonry piers of the primary system (which includes timber-framed masonry in all storeys) fail. In this regard, two different structural models are presented herein to simulate the response of each system. A macro-model based on nonlinear (NL) strut elements and point plastic hinges is intended to model the timber-framed masonry. NL analyses are carried out for one, two and three storey buildings , which represent the most common cases in Lefkas. Furthermore, an investigation is carried out regarding the foundation of the buildings resting on soft alluvial deposits. Pushover curves are derived from the NL analyses of the buildings and are then converted to capacity curves using the characteristics of the predominant mode. On these curves four damage states (slight damage, moderate damage, heavy damage, and collapse) are defined on the basis of criteria related to the actual response of the building. Then, fragility curves in terms of spectral displacement are generated, adopting a log-normal statistical distribution. These curves are converted into PGA values using a selected response spectrum. Utilising these fragility curves a seismic loss scenario for the 2003 Lefkas earthquake is developed for the timber-framed masonry stock of Lefkas city. Permanent repository link

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Section: Pilot Seismic Loss Scenariomentioning

confidence: 99%

Fragility Curves and Loss Estimation for Traditional Timber-Framed Masonry Buildings in Lefkas, Greece

Kouris

Kappos

2015

Computational Methods in Applied Sciences

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“…Contrary to SNR, variance reduction (VR) is not usually applied in site-effect studies, but rather in source studies (e.g., Chi et al, 2001;Skarlatoudis et al, 2003;Scherbaum et al, 2004). Variance reduction may also be used to discriminate between higher and lower quality data.…”

Section: Signal-to-noise Ratio and Variance Reductionmentioning

confidence: 99%

Variance Reduction and Signal-to-Noise Ratio: Reducing Uncertainty in Spectral Ratios

Ktenidou¹,

Chávez-García²,

Pitilakis³

2011

Bulletin of the Seismological Society of America

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This paper uses an unusually large dataset to study scatter in site-effect estimation, focusing on how the events that increase uncertainty can be removed from the dataset. Four hundred seventy-three weak motion earthquake records from the surface and bedrock of a 178-m-deep borehole in Aegion, Gulf of Corinth, Greece, are used to evaluate spectral ratios. A simple statistical tool, variance reduction (VR), is first used to identify two groups of events that lie closest and farthest from the average, which is considered here as the initial best estimate of the site response. The scatter in the original dataset is found to be due to the group of events with smallest VR. These events can be removed from the dataset in order to compute a more reliable site response. However, VR is not normally used to choose records for siteeffect studies, and it cannot be applied to the usual small datasets available. The signal-to-noise ratio (SNR) is normally used to this end, for which reason we investigate whether SNR can be used to achieve similar results as VR. Signal-to-noise ratio is estimated using different definitions. Data selection based on SNR is then compared to that using VR in order to define an SNR-based criterion that discriminates against events that, according to VR, increase scatter. We find that defining the SNR of a surface record as the mean value over a frequency range around the resonant peak (here, 0.5-1.5 Hz) and using a cutoff value of 5 may be used in this case to exclude most events for which VR is small. This process is also applied to the downhole station, where we obtain similar results for a cutoff value of 3.

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“…Fig. 7 shows the horizontal components of PGA, PGV and PGD in the M5.5 and M6.2 models plotted together with empirical relations developed by Campbell [19] and Skarlatoudis et al [20][21][22] scaled to the actual earthquake magnitude. The empirical relations are based primarily on data from small to moderate size earthquakes.…”

Section: Rock Deformations Velocities and Accelerationsmentioning

confidence: 99%

“…Comparison of PGA, PGV and PGD in the M5.5 and M6.2 models with empirical attenuation relations from Campbell [19] and Skarlatoudis et al [20][21][22] scaled to the actual earthquake magnitude. The ±1σ-curves are from Skarlatoudis et al [20,22].…”

Section: Figurementioning

confidence: 99%

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A generic approach for simulation of large earthquakes

Fälth

Hökmark

Munier

2009

WIT Transactions on the Built Environment

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This paper presents a generic modeling approach to estimate the possible static and dynamic effects of an earthquake on a deep repository for spent nuclear fuel. 3D models, including a discrete fault plane and numerous surrounding fractures, are analyzed dynamically with 3DEC. An algorithm to control the rupture initiation and the following propagation along the fault plane is developed. Model geometries, the mechanical properties of fault and rock, and the in-situ stresses are calibrated to give the intended seismic moment. M5 and M6 events are simulated with models where the complete fault plane is included (full 3D models). In order to simulate larger earthquakes (M7.5), quasi-3D models with truncated fault planes are developed. The relevance and conservativeness of the models are assessed by comparison of the resulting fault movement and ground motions with data found in the literature.

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Empirical Peak Ground-Motion Predictive Relations for Shallow Earthquakes in Greece

Cited by 90 publications

References 45 publications

Fragility Curves and Loss Estimation for Traditional Timber-Framed Masonry Buildings in Lefkas, Greece

Fragility Curves and Loss Estimation for Traditional Timber-Framed Masonry Buildings in Lefkas, Greece

Variance Reduction and Signal-to-Noise Ratio: Reducing Uncertainty in Spectral Ratios

A generic approach for simulation of large earthquakes

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