Design Displacement Response Spectra for Southern and Eastern Romania

Abstract eng:
This study is focused on the assessment of displacement response spectra for the southern and eastern part of Romania which are under the influence of the Vrancea subcrustal seismic source. The evaluation of the displacement response spectra is performed using two approaches. In the first approach, the displacement response spectra are computed from stochastic finite-fault simulations obtained for 32 sites situated in the southern and eastern part of Romania and which are under the dominant influence of the intermediate-depth Vrancea seismic source. The soil conditions for each site are evaluated using the horizontal-to-vertical spectral ratio technique, while the earthquake epicenters for the simulated earthquakes are proposed using the seismicity of the XXth century. In the second approach, the displacement response spectra are obtained through probabilistic seismic hazard assessment using the results from hazard models published recently in the literature. Finally, the results are compared with the provisions from the current Romanian seismic design code P100-1/2013. The study highlights two main aspects: (i) the need for more studies related to the evaluation of soil conditions in Romania and (ii) the need to supplement the existing database of strong ground motions recorded during Vrancea intermediate-depth earthquakes with simulated ground motions in order to gain more information regarding the influence of the earthquake magnitude and local site conditions on the spectral displacements.

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