A preliminary empirical model for frequency-dependent attenuation of Fourier amplitude spectra In Serbia from the Vrancea earthquakes

Lee, V.W.; Trifunac, Mihailo D.; Bulajić, Borko Đ.; Manić, M.I.

doi:10.1016/j.soildyn.2015.12.004

Cited by 25 publications

(10 citation statements)

References 40 publications

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“…These studies show that even if the shallow geology description takes into account more than 30 m of the local soil depth (e.g., in the case we use the Seed's et al [32] classification), empirical predictions may still be biased, so the deeper geology conditions need to be considered. It is important to note that the mentioned studies show that PGA amplitudes are not so sensitive to strong distant earthquakes, e.g., like those occurring in the Vrancea region in Romania [33,34]. This is due to the fact that the short-period waves attenuate fast, and, when they propagate starting from distant sources, their final contribution is going to be smaller than the contribution given by local events, even in the case of very strong (and very distant) events.…”

Section: Citymentioning

confidence: 98%

A Contribution to a UHS-Based Seismic Risk Assessment in Croatia—A Case Study for the City of Osijek

2020

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Due to increases in the number of inhabitants and their concentrations in densely populated areas, there is a growing need in modern society to be cautious towards the impact of catastrophic natural events. An earthquake is a particularly major example of this. Knowledge of the seismic vulnerability of buildings in Europe and around the world has deepened and expanded over the last 20 years, as a result of the many devastating earthquakes. In this study, a review of seismic risk assessment methods in Croatia was presented with respect to the hazard, exposure, and vulnerability of buildings in the fourth largest city (Osijek) in Croatia. The proposed algorithm for a detailed risk assessment was applied to a database and is currently in its initial stage.Sustainability 2020, 12, 1796 2 of 24 to estimate the losses. These losses can be assessed in a material form, through the damage of the building stock or non-structural elements of buildings, or in the form of casualties or injuries during the earthquake [10,11]. The last step is to analyze uncertainties, costs, decision-making criteria, etc. The ultimate goal of studying earthquakes and their impact on people and buildings is to create a safer environment, in case an earthquake occurs.The basic elements of the earthquake risk assessment process are shown in Figure 1.Sustainability 2020, 12, 1796 2 of 25 probable intensity in a given geographical area). Then, based on the available data from the exposure model, evaluate the damage using one of the existing vulnerability assessment methods in order to estimate the losses. These losses can be assessed in a material form, through the damage of the building stock or non-structural elements of buildings, or in the form of casualties or injuries during the earthquake [10,11]. The last step is to analyze uncertainties, costs, decision-making criteria, etc. The ultimate goal of studying earthquakes and their impact on people and buildings is to create a safer environment, in case an earthquake occurs. The basic elements of the earthquake risk assessment process are shown in Figure 1.

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Section: Citymentioning

confidence: 98%

A Contribution to a UHS-Based Seismic Risk Assessment in Croatia—A Case Study for the City of Osijek

2020

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“…3). This results in attenuation of high-frequency spectral amplitudes [46,47], thus the UHS for peak accelerations in Skopje (Fig. 4), for a typical range of exceedance probabilities, are dominated only by local seismicity.…”

Section: Contribution Of the Vrancea Earthquakes To Seismic Hazardmentioning

confidence: 99%

“…The methodology, scaling equations, and descriptions of seismicity used in this paper are same as those described by [46,47,[40][41][42] and will not be repeated here. Useful features of this methodology are that (1) the detailed spatial variations of the geologic site conditions can be included directly in the calculation of spectral amplitudes, and as will be shown, are one of the significant factors influencing the final result; and (2) the consequences of contributions from large distant earthquakes (in this case from Vrancea in Romania) can also be included.…”

Section: Introductionmentioning

confidence: 99%

Seismic microzoning in Skopje, Macedonia

Lee

Trifunac

Bulajić

et al. 2017

Soil Dynamics and Earthquake Engineering

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Keywords:Microzonation maps, which include descriptions of site geology and site soil properties Contribution of a large distant earthquake to the design strong motion amplitudes Computation of seismic hazard for earthquake sources, which follow different attenuation laws A B S T R A C T Seismic microzonation maps for Skopje (Macedonia) are presented based on the Uniform-Hazard-Spectrum (UHS) methodology. UHS satisfies the guidelines for performance-based design (PBD), which require specification of two sets of spectral amplitudes, one for which the structure will remain essentially linear, and the other for which it will undergo a nonlinear response. The UHS method also considers the contributions from large distant earthquakes and includes simultaneous effects of site geology and site soils. The maps presented include the effects of near and distant large earthquakes in a balanced way, spatial distribution of seismic activity, site geology, and site soil properties.

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“…3). This results in attenuation of high-frequency spectral amplitudes [36,37] so that the UHS for peak accelerations in Štip (Fig. 4), for a typical range of exceedance probabilities, are dominated only by local seismicity.…”

Section: Vrancea Earthquake Contributions To Seismic Hazardmentioning

confidence: 99%

“…The methodology, scaling equations, and descriptions of seismicity used are the same as those described by Lee et al [33][34][35][36][37], and Lee and Trifunac [31,32] and will not be repeated here. Useful features in this work include (1) that the detailed spatial variations of the geologic site conditions can be integrated directly into the calculation of spectral amplitudes, and as will be shown, are one of the significant factors influencing the final result; and (2) that the consequences of contributions from large distant earthquakes (from Vrancea in Romania) can also be included.…”

Section: Introductionmentioning

confidence: 99%

Seismic microzoning of Štip in Macedonia

Lee

Trifunac

Bulajić

et al. 2017

Soil Dynamics and Earthquake Engineering

Self Cite

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Keywords:Microzonation maps, which include descriptions of site geology and site soil properties Contribution of a large distant earthquake to the design strong motion amplitudes Computation of seismic hazard for earthquake sources, which follow different attenuation laws A B S T R A C T Seismic microzonation maps for Štip (Macedonia) and its surroundings are presented based on the uniformhazard-spectrum (UHS) methodology. Such mapping satisfies the guidelines for performance-based design (PBD), which requires specification of two sets of spectral amplitudes-one for which the structure will remain essentially linear, and the other for which it will undergo a nonlinear response. The UHS method also enables us to include contributions from excitation by large distant earthquakes as well as the simultaneous effects of site geology and site soils. Thus, the maps we present include, in a balanced way, the effects of near and distant large earthquakes, spatial distribution of seismic activity, the site geology, and the site soil properties.

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A preliminary empirical model for frequency-dependent attenuation of Fourier amplitude spectra In Serbia from the Vrancea earthquakes

Cited by 25 publications

References 40 publications

A Contribution to a UHS-Based Seismic Risk Assessment in Croatia—A Case Study for the City of Osijek

A Contribution to a UHS-Based Seismic Risk Assessment in Croatia—A Case Study for the City of Osijek

Seismic microzoning in Skopje, Macedonia

Seismic microzoning of Štip in Macedonia

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