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SEISMICITY IN BULGARIA AND SURROUNDINGS IN THE FIRST 20 YEARS OF THE TWENTY-FIRST CENTURY
Abstract
An earthquake catalogue covering the seismicity on the territory of Bulgaria and adjacent lands for the period 2000-2020 is presented in the current study. In this catalogue are included events with magnitude equal to or larger than Mw ? 2.5. As a country, Bulgaria belongs to the Alpo-Hymalian seismic belt, it is also not absent of strong earthquakes. Bulgaria is an earthquake prone country taking in account that on its territory are recorded some of the strongest earthquakes from the beginning of the last century until present day. The seismology in Bulgaria dates back to the beginning of the 20th century with the installation of the first seismograph on the territory of the country, going through the modernisation and establishment in 2006 of NOTSSI (National Operative Telemetric System for Seismological Information) and until today when there are 26 stations (this number includes two local seismic networks in Kozloduy and Provadia) from which NOTSSI receives real-time data. In the present catalogue, Mw magnitude is calculated for the entire period applying regression equations converting magnitude scales used in Bulgarian seismological routine practice (Md and Mp) to the most reliable and widely used scale of magnitude, i.e. the seismic moment magnitude, Mw. The current study presents spatial and temporal distribution of the earthquakes for the period 2000-2020. Before analysis of the data the catalogue was declustered – aftershocks and foreshocks were removed as well as artificial events such as explosions. The fullness of the catalogue is examined through Gutenberg-Richter graphic. A depth-magnitude frequency histogram is done to establish earthquakes with what depth and magnitude are most often observed.
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References11
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