Yordanka DonkovaBulgarian Academy of Sciences Geological Institute Strashimir Dimitrov · Earthquake Geology
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Eight Bessarabian (Sarmatian) serpulid bioherms located among aragonite sediments of the Topola Formation in section Zelenka (Northeastern Bulgaria) have been studied to elucidate their macro- and microscopic characteristics. It is concluded that these bioherms were formed under identical arid climatic conditions as the associated aragonite sedimen...
The Thracian settlement near the town of Letnitsa is situated on the left fluvial terrace of the Osam River. Hosting sediments are determined as sandy clayey silts, limy in various degrees. Deposits from the western and central parts are compared and both show similar mineralogical composition. These from the central parts contain more fine silt an...
Along the Vladayska River on the territory of Sofia are analyzed Quaternary sediments from five different sites (24 samples). On the base of this investigation are composed two three-component diagrams to define the sedimentary varieties. To determine the sedimentary environments (river channel or overbank deposits) in studied area are used relatio...
Sediments collected from terraces along alluvial rivers in Sofia basin are studied to characterize their grain-size and mineralogical composition, and to assess the origin of the transported and deposited materials. All samples studied appeared to be sand with various gravel admixtures, poorly to very poorly sorted with σ1 1.4φ−2.7φ, mean size betw...
The earthquake of M W 5.6 on 22 May 2012 in SW Bulgaria is a shallow normal-faulting earthquake. Coseismic ground cracks along a fault-line scarp, focal mechanisms and hypocentre allocations suppose that the seismogenic source is a normal fault segment from the NW boundary fault of Pernik basin, named Meshtitsa fault, which has not been considered...