Studies Concerning Directionality of Seismic Action for Vrancea Earthquakes

The accelerograph network of Building Research Institute INCERC Bucharest consists of 71 SMA-1 accelerographs located in all seismic zones of Romania. A number of 51 accelerographs are mounted at ground level in low-rise buildings. The INCERC network furnished more then 110 useful records obtained during the Vrancea earthquakes of March 4, 1977 (Richter magnitude M = 7.2), August 31, 1986 (M = 7.0), May 30, 1990 (M = 6.7) and May 31, 1990 (M = 6.1), codified in the following as events 771, 861, 901 and 902.