Seismic hazard maps in Macedonia

Lee, V.W.; Trifunac, Mihailo D.

doi:10.1016/j.soildyn.2017.06.010

Cited by 18 publications

(30 citation statements)

References 55 publications

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“…Fig. 2 shows the analogous seismic hazard map also for the probability of being exceeded a p=0.1 during an exposure period of Y=50 years, calculated by Lee and Trifunac [32]. It gives roughly twice larger peak acceleration in Štip, which is equal to 0.33g.…”

Section: Introductionmentioning

confidence: 87%

“…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%

“…2 are very different, and thus the results cannot be compared directly. Nevertheless, the end results show differences in peak accelerations of about a factor of two [31,32]. The amplitudes in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Contributions from the Vrancea earthquake source in Romania are not included. Contours are shown for a probability of 10% exceedance and an exposure period of Y=50 years (redrawn from [32] [54][55][56][57][58][59][60][61][62][63][64][65][66] The development of hazard maps begins with the definition of spatial distribution of seismic sources and their activity in time. The description of this activity, as used in this paper, is briefly outlined in Appendix A.…”

Section: Introductionmentioning

confidence: 99%

“…4. An example of a seismic zoning map for Macedonia for the ratio of pseudo spectral acceleration, relative to seismicity without contributions from the Vrancea earthquakes, for a 5% fraction of critical damping, computed with UHS method, for the basement rock sites (s=2) and rock soil sites (S L =0) at 12 periods ranging from 0.04 to 2.00 s, for a probability of p=0.10 exceedance and an exposure time of Y=50 years (redrawn from [32]). …”

Section: Introductionmentioning

confidence: 99%

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Seismic microzoning of Štip in 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 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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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic microzoning of Štip in Macedonia

Lee

Trifunac

Bulajić

et al. 2017

Soil Dynamics and Earthquake Engineering

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Seismic microzoning of the Delhi metropolitan area, India—II: Hazard computation and zoning maps

Gupta

Lee

Trifunac

2022

Earthquake Engineering and Resilience

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We present seismic microzonation maps of New Delhi, India, using the probabilistic seismic hazard analysis (PSHA) method with input seismic activity parameters estimated in Part-I of this two-part paper. Our calculations required three different attenuation equations for amplitude scaling of strong ground motion from three principal contributing sources: the National Capital Region (NCR), Northwestern Himalaya (NWH), and the Hindu Kush subduction (HKS). We show that uniform hazard spectral (UHS) amplitudes are dominated only by the local seismicity in the NCR at high frequencies beyond about 2 Hz. For intermediate and long periods, UHS amplitudes are dominated by contributions from the NWH and HKS earthquakes. Our results show that specifying strong motion amplitudes for use in engineering design by means of peak ground acceleration can lead to serious errors for buildings higher than four to five stories and hence should not be used. Our results also show that the shape of design spectra must depend on the nature of contributing earthquake sources, their relative activity, potential to create large magnitudes, and geographical placement relative to the site of interest, and thus a standard design-spectrum shape cannot satisfy all these requirements. We use local geological site condition parameters directly in all calculations and present hazard maps for three different soil site conditions ("rock," stiff soil sites, and deep soil sites). Thus, the user can extract the UHS amplitudes of pseudo relative velocity spectra at any site in the National Capital Territory by experimentally determining the local soil site conditions and then applying the corresponding maps shown in this paper. K E Y W O R D Scontribution from a large distant earthquake to the design strong motion amplitudes; computation of seismic hazard for earthquake sources, which follow different attenuation laws; microzonation maps that include a description of site geology and site soil properties

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