Abstract:
Generalized analysis of the monitoring of the seismicity over the territory of Bulgaria and its very adjacent lands for the last 32 years is proposed. More than 32 000 seismic events with magnitude M > 0.5 are localized in this region since 1981 – the time of the modern National Seismological Network starting operated. Catalog of earthquakes with magnitude M>4.0 is applied. The time and space variation of the seismicity is traced out by the consequential analysis of the epicentral distributions around the seismic zones for each 5-years period during the time operation of the National Seismological Network. Some more or less clear expressed grouping of epicenters of strongest earthquakes around the main Quaternary active fault structures is established, as well as some kind of “migration” of the strong seismicity during the time – from north-east to south-west and vise versa.