An empirical model for the vertical‐to‐horizontal spectral ratios for Italy

Ramadan, Fadel; Smerzini, Chiara; Lanzano, Giovanni; Pacor, Francesca

doi:10.1002/eqe.3548

Cited by 15 publications

(3 citation statements)

References 42 publications

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“…In Figure 8 which are comparable or even larger than the horizontal ones, consistent with observational evidences of large vertical-to-horizontal ratios in near-source conditions (Ramadan et al 2021).…”

Section: Velocity Motion and Ground Shaking Mapssupporting

confidence: 87%

Regional physics-based simulation of ground motion within the Rhȏne Valley, France, during the MW 4.9 2019 Le Teil earthquake

Smerzini

Vanini

Paolucci

et al. 2022

Bull Earthquake Eng

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In this paper, a comprehensive validation exercise of 3D physics-based numerical simulations (PBS) of seismic wave propagation is presented for a low-to-moderate seismicity area in the south east of France, within the Rhône River Valley, that hosts several operating nuclear installations. This area was hit on Nov 11, 2019, by an unusually damaging Mw 4.9 earthquake (Le Teil event). The numerical code SPEED ( http://speed.mox.polimi.it/ ), developed at Politecnico di Milano, Italy, was used to validate the simulations against the available recordings. When comparing simulations with records, a good to excellent agreement was found up to 8-10 Hz, showing that, even without a very detailed 3D numerical model of the medium, the PBS may provide realistic broadband predictions of earthquake ground motion. This also demonstrates that PBS, if suitably calibrated and validated, may be either an alternative or a useful complement to empirical ground motion models. Referring to the seismic risk evaluation of strategic and critical structures, infrastructures and industrial plants, such as nuclear power plants, the failure of which during an earthquake may endanger safety of population and cause environmental disasters, the 3D PBS may throw light on region-and site-specific features of ground shaking, especially in near-source conditions, that are typically poorly constrained in empirical models.

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Section: Velocity Motion and Ground Shaking Mapssupporting

confidence: 87%

Regional physics-based simulation of ground motion within the Rhȏne Valley, France, during the MW 4.9 2019 Le Teil earthquake

Smerzini

Vanini

Paolucci

et al. 2022

Bull Earthquake Eng

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“…6), indicating, as clearly visible in Fig. 5, that the vertical component is richer in higher frequencies than the horizontal ones, as expected from empirical studies available in the literature (e.g., Ramadan et al, 2021). Also, from these gures we observe that stations farther away from the epicentre (like BFJ and KEF) experience longer duration shaking than those close to the epicentre.…”

Section: Ground Motion Recordingssupporting

confidence: 82%

Strong ground motion from the seismic swarms preceding the 2021 and 2022 volcanic eruptions at Fagradalsfjall, Iceland

Hernández-Aguirre,

Rupakhety,

Ólafsson

et al. 2023

Bull Earthquake Eng

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The Geldingadalir and Meradalir eruptions at Mt. Fagradalsfjall in the Reykjanes Peninsula on 19 March 2021 and 3 August 2022, respectively, were preceded by intense volcano-tectonic swarms. Eight earthquakes with M ≥ 5 were recorded by the Icelandic Strong Motion Network. We present an overview of the seismicity in Fagradalsfjall, and salient features of the strong ground motion caused by the swarms in the epicentral area. The largest recorded horizontal Peak Ground Acceleration (PGA) was ~ 0.45g at Grindavík, which is the strongest PGA recorded in Iceland since the M W 6.3 2008 Ölfus Earthquake. Recorded waveforms show a rich long-period energy content, with a burst of higher frequencies at the beginning of shaking. This leads to larger response spectral accelerations at long periods that those from typical shallow crustal earthquakes. Moreover, an empirical mixed-effects ground motion model for PGA was calibrated based on the available recordings. The attenuation rate of PGA from this model is similar to that introduced by Lanzano and Luzi (2020) which is based on data from volcanic events in Italy, but the magnitude scaling of our model is much lower. The overall results indicate that scaling and attenuation of ground motion from volcanic events and purely tectonic earthquakes in Iceland are likely very different. This is an important observation because seismic hazard in parts of the Reykjavik area and of the central highlands, where important hydroelectric power plants are located, could potentially be dominated by events of volcanic origin. Therefore, it is important to take these observations into account for seismic hazard and risk assessment in Iceland.

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“…In addition, a second aim of this study was to align the definition of the vertical elastic acceleration response spectra to the ones from the proposed Eurocode 8 draft [23]. It is important to note, as well, that various ground-motion prediction equations (GMPEs) for the vertical-to-horizontal spectral acceleration (V/H) ratio have been proposed in the literature using ground motions recorded during crustal earthquakes as input (e.g., [24][25][26][27][28][29][30][31][32][33][34]).…”

Section: Introductionmentioning

confidence: 99%

Vertical Elastic Acceleration Response Spectra for Vrancea Intermediate-Depth Earthquakes

Pavel,

Vacareanu,

Aldea

et al. 2024

Buildings

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This study is focused on the evaluation of vertical elastic acceleration response spectra for Vrancea intermediate-depth earthquakes in Romania in the context of the ongoing update of the national seismic design code. The ground motion database employed in this research consists of about 500 ground motions recorded during moderate and large Vrancea intermediate-depth earthquakes with moment magnitudes MW ≥ 5.2. The analysis of the dataset showed that a single ground motion recording had a peak ground acceleration larger than 0.20 g. The results of the analyses showed that no significant differences between the control periods of the vertical elastic response spectra as a function of the site class could be inferred. It was also observed that the mean value of the amplification factor computed for the entire ground motion database was about 2.5, irrespective of the earthquake magnitude, site class, or level of horizontal peak ground acceleration. However, larger-magnitude earthquakes generate larger spectral amplifications in the medium- and long-period ranges. The analysis of the ground motions recorded in Bucharest area revealed a magnitude dependency of the control period for the vertical ground motion TC,v. Finally, a single spectral shape for vertical acceleration response spectra characterized by a maximum dynamic amplification factor of 2.5 and control periods TBv and TCv of 0.05 s and 0.60 s is proposed for design purposes. This aspect allows for a major update from the current version of the national seismic design code which proposes control periods of the elastic vertical response spectrum dependent on the horizontal ones. The short-period (at T = 0.2 s) and long-period (at T = 1.0 s) ratios of the vertical acceleration response spectrum to the corresponding horizontal ones are 0.50 and 0.40.

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An empirical model for the vertical‐to‐horizontal spectral ratios for Italy

Cited by 15 publications

References 42 publications

Regional physics-based simulation of ground motion within the Rhȏne Valley, France, during the MW 4.9 2019 Le Teil earthquake

Regional physics-based simulation of ground motion within the Rhȏne Valley, France, during the MW 4.9 2019 Le Teil earthquake

Strong ground motion from the seismic swarms preceding the 2021 and 2022 volcanic eruptions at Fagradalsfjall, Iceland

Vertical Elastic Acceleration Response Spectra for Vrancea Intermediate-Depth Earthquakes

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