Keywords
paleoseismic phenomena, environment, cartographic models, bregare, moesian platform, bulgaria
Start Date
1-7-2006 12:00 AM
Abstract
The Bregare dislocation was a result of the impulse event a block was torn away. The anomalous relief deformations and tectonic discordance of greatest intensity provide evidence that the paleoearthquakes took place at the Pliocene-Quaternary boundary, between the Pleistocene, Pleistocene-Holocene boundary and the Holocene. It exerted impact on the terrain around the Oryahovitsa and Bregare villages and disturbed the highly raised Neogene base in the range of the Iskar River flood terrace. The paleoearthquakes were catastrophic and disturbed the watersheds and the river terraces, changed the directions of river runoff, caused the subsidence and destruction of karst caverns, etc. Secondary earthquake effects were observed in the land of the Glava and Bregare villages during the Vrancea earthquake in 1977 (Romania). All naturally occurring processes in the region of Krushovitsa, Bregare, Glavinitsa and other settlements have been enhanced after the last Vrancea earthquakes: erosion, denudation, accumulative and karst processes, accompanied by destruction of soil and anthropogenic hazards. The present work shows also the geoecological assessment of the contemporary natural hazards. For the study purposes are prepared different types of maps (shown the specific maps applied) of 25,000 scale, which served for the qualitative and quantitative assessment of natural and anthropogenic hazards. As a final product a map of the region of Bregare paleoseismic phenomena by their degree of unstable natural and anthropogenic equilibrium is prepared.
ENVIRONMENTAL CARTOGRAPHIC MODELS FOR THE REGION OF BREGARE PALEOSEISMIC PHENOMENA, MOESIAN PLATFORM (BULGARIA)
The Bregare dislocation was a result of the impulse event a block was torn away. The anomalous relief deformations and tectonic discordance of greatest intensity provide evidence that the paleoearthquakes took place at the Pliocene-Quaternary boundary, between the Pleistocene, Pleistocene-Holocene boundary and the Holocene. It exerted impact on the terrain around the Oryahovitsa and Bregare villages and disturbed the highly raised Neogene base in the range of the Iskar River flood terrace. The paleoearthquakes were catastrophic and disturbed the watersheds and the river terraces, changed the directions of river runoff, caused the subsidence and destruction of karst caverns, etc. Secondary earthquake effects were observed in the land of the Glava and Bregare villages during the Vrancea earthquake in 1977 (Romania). All naturally occurring processes in the region of Krushovitsa, Bregare, Glavinitsa and other settlements have been enhanced after the last Vrancea earthquakes: erosion, denudation, accumulative and karst processes, accompanied by destruction of soil and anthropogenic hazards. The present work shows also the geoecological assessment of the contemporary natural hazards. For the study purposes are prepared different types of maps (shown the specific maps applied) of 25,000 scale, which served for the qualitative and quantitative assessment of natural and anthropogenic hazards. As a final product a map of the region of Bregare paleoseismic phenomena by their degree of unstable natural and anthropogenic equilibrium is prepared.
