Spectral Characteristics of Strong Ground Motions from Intermediate-Depth Vrancea Seismic Source

Pavel, Florin; Vǎcǎreanu, Radu; Cioflan, Carmen Ortanza; Iancovici, Mihail

doi:10.1785/0120130334

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…Booth [23] and Malhotra [24] have proposed empirical relations for the computation of the peak values of the ground motion (acceleration, velocity, and displacement) using the maximum acceleration, velocity, and displacement spectral ordinates. e empirical relations obtained using the ground motion dataset from this study and the ones proposed by Booth [23], Malhotra [24] and Pavel et al [15] are reported in Table 2. It can be observed that there are significant differences between the relations reported in Pavel et al [15] and those proposed in this study.…”

Section: Correlation Of Spectral Accelerations With Peak Ground Velocity and Displacementmentioning

confidence: 86%

“…e empirical relations obtained using the ground motion dataset from this study and the ones proposed by Booth [23], Malhotra [24] and Pavel et al [15] are reported in Table 2. It can be observed that there are significant differences between the relations reported in Pavel et al [15] and those proposed in this study. e reason for these differences is due to the fact that, in this study, only ground motions recorded in Bucharest area are employed, while in the study of Pavel et al [15], ground motions recorded all over the Romanian territory were used.…”

Section: Correlation Of Spectral Accelerations With Peak Ground Velocity and Displacementmentioning

confidence: 86%

“…A reverse faulting mechanism with the rupture propagating in the NE-SW direction [14] (for most of the earthquakes and for the largest ones) or in the NW-SE direction is observed for all the seismic events in the database. A part of this database has been used in previous studies (e.g., [15]) and has been extended for this research.…”

Section: Ground Motion Databasementioning

confidence: 99%

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Variability of Ground Motion Amplitudes Recorded in Bucharest Area during Vrancea Intermediate‐Depth Earthquakes

Pavel

2021

Shock and Vibration

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This study focuses on the assessment of the correlation and variability of ground motion amplitudes recorded in Bucharest area during Vrancea intermediate-depth earthquakes from a database of 119 pairs of horizontal components. Empirical models for the evaluation of the peak ground velocity and displacement from spectral accelerations are proposed in this study. The distribution of the shear wave velocities from 41 boreholes at specific depths appears to follow a normal probability distribution. The analysis performed in this study has also shown that the variability of peak ground velocities and displacements does not appear to be influenced by the earthquake magnitude. In addition, it was observed that the variability in terms of shear wave velocities at specific depths is smaller than the variability of the spectral amplitudes of the recorded ground motions. The empirical site-amplification factors from the Eurocode 8 draft fail to capture the long-period spectral amplifications observed in Bucharest area during large magnitude Vrancea intermediate-depth earthquakes.

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Section: Correlation Of Spectral Accelerations With Peak Ground Velocity and Displacementmentioning

confidence: 86%

Section: Correlation Of Spectral Accelerations With Peak Ground Velocity and Displacementmentioning

confidence: 86%

Section: Ground Motion Databasementioning

confidence: 99%

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Variability of Ground Motion Amplitudes Recorded in Bucharest Area during Vrancea Intermediate‐Depth Earthquakes

Pavel

2021

Shock and Vibration

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“…The distributions of the peak ground accelerations during large-magnitude Vrancea earthquakes were discussed by Lungu et al [11]. The spectral characteristics of the horizontal ground motion recordings from Vrancea seismic events were analyzed in the study by Pavel et al [12]. The directional effects of the ground motions recorded during Vrancea earthquakes were discussed by Pavel et al [13].…”

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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“…The subduction process beneath the Carpathian Mountains is estimated to have stopped about 10 million years ago [7]. From the engineering point of view, the analysis of the spectral characteristics of the ground motions recorded during Vrancea intermediate-depth earthquakes which have occurred in the period 1977-2013 (10 seismic events) can be found in the study of Pavel et al [8]. More recently, three additional intermediate-depth moderate seismic events (M W ≈ 5.5) occurred in September 2016, December 2016 and October 2018.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Key PSHA Assumptions—Case-Study for Romania

Pavel

2021

Geosciences

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This case-study focuses on the analysis of several key assumptions necessary for the probabilistic seismic hazard assessment of Romania in the light of a future seismic hazard zonation of the territory. Among the aspects analyzed in this study are the appropriateness of the Poisson assumption which is tested on the earthquake catalogs of several seismic sources (crustal and the Vrancea intermediate-depth source), the azimuthal dependence of ground motion amplitudes from Vrancea intermediate-depth earthquakes and possible ground motion amplifications due to basin effects. The analyses performed in this study show that the Poisson distribution is able to model the observed earthquake frequency occurrence for the larger magnitude seismic events both for crustal and intermediate-depth seismic sources. Similar ground motion attenuation patterns irrespective of the azimuth with respect to the Vrancea intermediate-depth seismic source were observed only in the case of the 30 May 1990 earthquake, while in the case of the seismic events of 30 August 1986 and 31 May 1990 significant azimuthal ground-motion attenuation differences were observed. No significant differences in terms of ground motion amplitudes were observed at three seismic stations in Iasi area during the Vrancea intermediate-depth earthquakes of 30 May 1990 and 31 May 1990 possibly due to the limited elevation difference. Finally, significant long-period spectral amplifications were observed on the ground motions recorded at several sites from intramountainous depressions in Romania.

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Spectral Characteristics of Strong Ground Motions from Intermediate-Depth Vrancea Seismic Source

Cited by 14 publications

References 17 publications

Variability of Ground Motion Amplitudes Recorded in Bucharest Area during Vrancea Intermediate‐Depth Earthquakes

Variability of Ground Motion Amplitudes Recorded in Bucharest Area during Vrancea Intermediate‐Depth Earthquakes

Vertical Elastic Acceleration Response Spectra for Vrancea Intermediate-Depth Earthquakes

Evaluation of Key PSHA Assumptions—Case-Study for Romania

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