NEW APPROACH ON SEISMIC HAZARD ISOSEISMAL MAP FOR ROMANIA

摘要

The seismicity of Romania comes from the energy that is released by crustal earthquakes, which have a depth not more than 40 km, and by the intermediate earthquakes coming from Vrancea region (unique case in Europe) with a depth between 60 and 200 km. The authors developed the concept of "control earthquake"and equations to obtain the banana shape of the attenuations curves of the macroseimic intensity / (along the directions defined by azimuth Az), in the case of an Vrancea earthquake at a depth 80 < x < 160 km. There were used deterministic and probabilistic approaches, linear and nonlinear ones. The final map is in MMI intensity (isoseismal map) for maximum possible Vrancea earthquake with Richter magnitude, M_(GR) = 7.5. This will avoid any drawbacks to civil structural designers and to insurance companies which are paying all damages and life loses in function of earthquake intensity.