Scholarly record

ASSESSMENT OF VRANCEA EARTHQUAKES IMPACT RECORDED ON BULGARIAN TERRITORY

Prof. Svetoslav Simeonov, Assoc. Prof. Kiril Hadjiyski

Abstract

The Vrancea seismogenic zone is real menace not only for Romania but also for the neighbouring countries. Vrancea earthquakes cause casualties mainly in northern Bulgaria. Vrancea source is rather active one пїЅ more than 10 quakes with magnitude 5.1 < Mw < 7.0 (depth of hypocenters of 40 to 154 km) occurred during the last 30-ty years. In the last decade the Vrancea quakesпїЅ impact on our territory have been thoroughly recorded by the digital stations of the National Strong Ground Motion (SGM) Network of Bulgaria. Indicative records of the last 10 years are selected and processed. Data, relevant to the aseismic design of structures, for representative recording spots in north Bulgaria is extracted and discussed. Evaluation, comparison and assessment of the real dynamic impact on our territory of a number of latest Vrancea quakes is submitted, accounting for the difference in earthquake inputs: source mechanism, depths, amount of energy released, seismic wavesпїЅ travel path, distance to hypocentre etc.. The presented results provide an opportunity for researchers and engineers to do new investigations, designers to work in updated and adequate environment, i.e. considering the latest actual seismic action of Vrancea earthquakes on sites in NE Bulgaria and thus to contribute to seismic risk mitigation in our country.

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