Zoning of Sofia valley according to the level of geological hazard

Abstract

The main criteria for evaluation of the integral geological hazard in Sofia valley are presented in this paper. The criteria of the geological hazard are supplemented with the main characteristics of the geological, tectonic, morphological, geotechnical and hydrogeological conditions and factors, which are related to the emergence of phisicogeological processes. The geological-geomorphological, the lithological-geotecnical, the hydrogeological conditions are considered as a main factors that determinate the phisicogeological processes and then the level of geological hazard. The role of the tectonic movements — slow and sudden (earthquakes), the spatial configuration of faults, the possible activation zones are prioritized when determinate the level of hazard. The manifestation of all endogenic and exogenic geological activities are taken in consideration for different part of Sofia valley. A four-degree scale of geological hazard is determined, which include the following levels — very high, high, average and low.