Summary
Using the concerning data of the Bulgarian earthquakes with magnitude greater 4 the seismicity of the period 1901–1965 was computed after a method byUllmann andMaaz and represented cartographically by isolines. The map lets us interpret the relation of the seismicity to the tectonic situation of Bulgaria. Further, the annual frequency of earthquakes of different magnitude basing on the same data is given.
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References
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Grigorova, E., Sponheuer, W. & Maaz, R. Seismicity of Bulgaria. PAGEOPH 81, 101–111 (1970). https://doi.org/10.1007/BF00875016
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DOI: https://doi.org/10.1007/BF00875016