Vrancea earthquakes: a special challenge for seismic isolation in Bucharest

In 2000, finalizing the UNESCO-IGCP Project 414 and exploiting the existing CEI Network, neo-determinsitic maps of seismic hazard (peak amplitudes of the horizontal ground motion - displacement, velocity and design ground acceleration) were published (Panza & Vaccari, 2000). Shallow seismicity has been considered as a rule, limiting the computations to epicentral distances 64 90 km. The hypocentral depth considered is 10 km for events with magnitude Mw<7 and 15 km for larger events. For the Vrancea intermediate-depth events spectral properties especially determined for the Romanian these earthquakes have been considered and the computations have been performed over the Romanian, Northeastern Croatian and Hungarian territory, within a circle of 350 km of radius centered on Vrancea. The hypocentral depths considered are 90 km for M< 7.4 and 150 km for larger quakes

Cercetările din castrul cu val de pământ de la Câmpulung (cartierul Pescăreasa), 1987—1989 / Les recherches du camp à vallum en terre de Câmpulung (Pescăreasa), 1987—1989

Petolescu Constantin C., Cioflan Teodor. Cercetările din castrul cu val de pământ de la Câmpulung (cartierul Pescăreasa), 1987—1989 / Les recherches du camp à vallum en terre de Câmpulung (Pescăreasa), 1987—1989. In: Materiale şi cercetãri arheologice (Serie nouã), N°1 2001. 1999. pp. 215-220

Hazard seismic studies for the Romanian capital - Appling the shake map method

The shake map methodology for seismic hazard studies has been applied to a sector of Bucharest, the capital of Romania.  Geological and geotechnical profiles are known for this region. We have chosen as seismic input the event of  30 August 1986, MW = 7.1.  We discuss the propagation of a synthetic signal with known source characteristics, from source to bedrock and back to surface. It is possible to produce surface synthetic signals in the studied area, having very similar characteristics (accelerations) to the observed ones

Modern evaluation of the seismic hazard for the Romanian Plain

A new technique is developed to perform a deterministic hazard analysis in terms of physical parameters, i.e. displacements, velocities, maximum accelerations, and civil engineering specific ones, design accelerations. The method is adapted for the specific features of the Romanian Plain seismicity including the latest theoretical results in both seismotectonic and prediction fields, and data acquisitions. The deterministic analysis is performed computing free surface synthetic seismograms corresponding to different seismic sources and structural models, for crustal and intermediate-depth events separately. The DGA (design ground acceleration) greatest values and the NS and EW components resultant for the velocities and horizontal displacements are considered as a measure for seismic hazard level

Attenuation of the peak ground motion for the special case of Vrancea intermediate-depth earthquakes and seismic hazard assessment at NPP Cernavoda

Attenuation specific from Vrancea intermediate-depth focus toward SE is revised at length in order to re-evaluate the seismic hazard at the nuclear power plant (NPP) Cernavoda. To this aim, we took into consideration all the strong motion data available for the region and test a large range of relationship types. Since the instrumental data are limited as magnitude and  depth intervals, the extrapolation based on the attenuation laws deduced from these data to great magnitudes is very instable and must be carefully considered. The extrapolation outside the characteristic domain of the available database leads to large deviations, especially at large magnitudes and for the relations which contain the depth as independent parameter

Estimation of site effects in terms of a new microzonation map of Bucharest

Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 , Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal

Deterministic modeling for microzonation of Bucharest: case study for August 30, 1986 and May 30-31, 1990 Vrancea earthquakes

Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 , Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal

An innovative view to the seismic hazard form strong Vrancea intermediate-depth earthquakes: the case studies of Bucharest (Romania) and Russe (Bulgaria)

Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7, Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal