Empirical evaluation of the control period TC for intermediate-depth earthquakes: application for Romania

Pavel, Florin; Yaghmaei‐Sabegh, Saman

doi:10.1007/s11069-023-06110-x

Cited by 2 publications

(8 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A ground motion database of recordings from five Vrancea intermediate-depth earthquakes having moment magnitudes M W ≥ 6.0 is compiled for this analysis. The database is a part of the larger ground motion database used in the past studies of Yaghmaei-Sabegh et al [32] and Pavel and Yaghmaei-Sabegh [33], which deal with the evaluation of the mean period T M and of the control period T C for intermediate-depth earthquakes. Only ground motion recordings having a minimum peak ground acceleration (PGA) of 0.05 g [34] are selected for the analysis.…”

Section: Evaluation Of the Number Of Equivalent Cyclesmentioning

confidence: 99%

“…In this study, a total number of 10 empirical models are proposed for the evaluation of the equivalent number of cycles using the available parameters (both seismological and engineering). The soil conditions for each seismic station are evaluated using the criteria from the proposed Eurocode 8 draft [46] and are taken from the study of Pavel and Yaghmaei-Sabegh [33]. Due to the limited number of ground motions recorded on site classes A, D and E, the recordings from soil classes A and B are grouped into a single category.…”

Section: Empirical Models For the Number Of Equivalent Cyclesmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of Liquefaction Hazard for Sites in Romania Using Empirical Models

Pavel,

Vladut

2023

Infrastructures

Self Cite

View full text Add to dashboard Cite

This paper is focused on the evaluation of the liquefaction hazard for different sites in Romania. To this aim, a database of 139 ground motions recorded during Vrancea intermediate-depth earthquakes having moment magnitudes MW ≥ 6.0 is employed for the evaluation of the equivalent number of cycles for this seismic source. Several functional forms for the empirical evaluation of the equivalent number of cycles considering various seismological or engineering parameters are tested and evaluated. The regression analysis shows smaller uncertainties for the empirical models based on ground motion engineering parameters. Considering the lack of information in terms of engineering parameters, a simpler empirical model which accounts for the earthquake magnitude, source–site distance and soil conditions is selected for the liquefaction hazard analysis. Based on the proposed empirical model, specific magnitude scaling factors for Vrancea intermediate-depth earthquakes are proposed for the first time as well. The liquefaction hazard analysis is performed for sites whose seismic hazard is generated by either the Vrancea intermediate-depth seismic source or by local shallow crustal seismic sources. In the case of some of the selected sites, liquefaction phenomena were observed during past large-magnitude earthquakes. Unlike previous studies dealing with liquefaction analyses for sites in Romania, in this research, the hazard assessment is performed for various ground motion levels evaluated based on probabilistic seismic hazard assessment. Liquefaction hazard curves are constructed for each analyzed site. The results of the liquefaction hazard analysis show that this phenomenon is more likely to occur in the areas exposed to Vrancea intermediate-depth earthquakes, compared to the areas affected by local shallow earthquakes. In the case of the analyzed soil profiles from Bucharest, Craiova and Ianca, the minimum liquefaction safety factors less than one even for seismic hazard levels having mean return periods of 100 years and less.

show abstract

Section: Evaluation Of the Number Of Equivalent Cyclesmentioning

confidence: 99%

Section: Empirical Models For the Number Of Equivalent Cyclesmentioning

confidence: 99%

Assessment of Liquefaction Hazard for Sites in Romania Using Empirical Models

Pavel,

Vladut

2023

Infrastructures

Self Cite

View full text Add to dashboard Cite

show abstract

“…Buildings 2024, 14, 906 2 of 13 The characteristics of the horizontal components of ground motions recorded during Vrancea intermediate-depth earthquakes were analyzed in previous studies in the literature. For instance, Pavel and Yaghmaei-Sabegh [10] evaluated the control periods T C for the horizontal ground motions recorded during Vrancea intermediate-depth earthquakes. The distributions of the peak ground accelerations during large-magnitude Vrancea earthquakes were discussed by Lungu et al [11].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of the digital recordings, no processing was performed, since only the already processed recordings were available for this study. The horizontal components of the ground-motion recordings employed in this study were previously compiled in the study by Pavel and Yaghmaei-Sabegh [10] in which a prediction model for the control period T C was developed. Vrancea intermediate-depth seismic region is characterized by earthquakes with reverse faulting mechanisms (in almost all events) and focal depths in the range of 60-220 km [35,36] (with the majority of the earthquakes occurring in the depth ranges of 90-110 km and 130-150 km).…”

mentioning

confidence: 99%

“…Moreover, Figure 5 shows the normalized mean vertical acceleration response spectra as a function of the horizontal peak ground acceleration. It can be seen from Figure 5 that the main difference in terms of vertical spectral amplification period ranges is between the recordings having peak ground accelerations larger or smaller than 0.05 g. The control period TC,v for the vertical ground motion was evaluated using the same approach as that of the horizontal ground motions applied in the study by Pavel and Yaghmaei-Sabegh [10], namely, the approach from ASCE 7-16 [38]. In a previous study by Pavel and Lungu [39], a good correlation was observed between the two definitions of the control period TC (the one given by Lungu et al [3] and the one from ASCE 7-16 [38]).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Vertical Elastic Acceleration Response Spectra for Vrancea Intermediate-Depth Earthquakes

Pavel,

Vacareanu,

Aldea

et al. 2024

Buildings

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Empirical evaluation of the control period TC for intermediate-depth earthquakes: application for Romania

Cited by 2 publications

References 40 publications

Assessment of Liquefaction Hazard for Sites in Romania Using Empirical Models

Assessment of Liquefaction Hazard for Sites in Romania Using Empirical Models

Vertical Elastic Acceleration Response Spectra for Vrancea Intermediate-Depth Earthquakes

Contact Info

Product

Resources

About