Abstract:
A homogeneous earthquake catalogue for Bulgaria and adjacent areas covering the period 1981–2019 is presented. The existing catalogues (including instrumental seismicity) for Bulgaria, covering the time period 1981–2000, were updated for the time period 2001-2019 using instrumentally determined focal earthquake parameters. In the present update catalogue, MW is calculated for the entire period 1981–2019 applying the 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. Thus, a magnitude homogeneous catalogue concerning MW scales is presented. The extended catalogue contains 645 independent events. The completeness test revealed that the catalogue is complete for moment magnitudes larger than or equal to 3.2 for the last 39 yr.