Summary
Three quantities ΣM, ΣE1/2 and E2/3 are used for studying the Balkan earthquake provinces. Most of them show a regular trend of activity, for some of them the observation period of 70 years is too short. Some graphs give evidence of the coincidence or migration of activity.
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Kárník, V., Radu, C. Time variation of earthquake activity in the Balkan region. Stud Geophys Geod 21, 285–293 (1977). https://doi.org/10.1007/BF01613258
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DOI: https://doi.org/10.1007/BF01613258