Abstract
The seismic response of the ground motion is analysed using processed recordings and related spectral characteristics. The analysis is carried out for few representative different sites, with different geological local conditions. Data used are recordings from the last strongest seismic events (1986, August 30, Mw = 7.1, 1990, May 30, Mw = 6.9 and 1990, May 31, Mw=6.4). The approach used herein to assess the particular features of the seismic effects could open a new perspective in microzoning and risk studies. In the context of Vrancea-intermediate depth seismicity, whose effects are encountered at long epicentral distances, the choice of these sites is fully justified. Therefore the paper intends to focus on the particularities in the site effects that occur due to the sedimentary deposits’ oscillation under strong seismic ground motion for different areas. The spectral amplification factors are introduced in order to have a quantitative representation with respect to the variability of site effects.
Highlights
The seismic response and local seismic effects are analysed in terms of spectral accelerations (Sa) and maximum ground acceleration for city of Bucharest, capital of Romania and other cities from the 84 outside of the Carpathian Arc Bend
The necessity of defining a fundamental period-value range corresponding to seismic movements for each site, by comparing some terrain characteristics induced by strong events and their changes related to the magnitude of the earthquake
The spectral amplification factors (SAF), which may give a hint about seismic response at strong seismic loadings, could be employed with relevance on seismic hazard and local site effects
Summary
The seismic response and local seismic effects are analysed in terms of spectral accelerations (Sa) and maximum ground acceleration (amax) for city of Bucharest, capital of Romania and other cities from the 84 outside of the Carpathian Arc Bend (including Cernavoda city, where is situated a Nuclear Power Plant). As regards the predominant periods from the elastic response spectra it is worth noticing the tendency to encounter long fundamental oscillating periods (sometimes exceeding 1 s) at seismic stations in the Bucharest area, as well as in some other spots over ExtraCarpathian territory, especially for very strong seismic events. Another feature was observed especially for the capital city area, which is the decreasing values of the predominant period of soil, with the decreasing of the earthquake magnitude. The necessity of defining a fundamental period-value range corresponding to seismic movements for each site, by comparing some terrain characteristics induced by strong events (acceleration, amplitudes from response spectra, oscillating period of the superficial soil deposit) and their changes related to the magnitude of the earthquake
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