1887

Abstract

Summary

We study spatial and temporal properties of the seismic activity in the Shabla-Kavarna-Balchik region over the period 1986–2014. This region is located in the NE part of Bulgaria (longitude range between 27.75E and 30.0E, and latitude range between 43.0N and 44.3N). The seismic activity there is related to a multitude of onshore and offshore faults. We use data from the Bulgarian National Seismic Network to identify 204 earthquakes in the region for the considered period. We find that the seismic activity rate increases abruptly after the August 5th 2009 Md=4.7 offshore earthquake. We identify the most active faults in the region for the considered period: (1) the Kaliakra fault; (2) the Batovo fault; (3) the Shabla fault; (4) the Razelm fault, as well as several near-coastal NNE-SSW faults where the aftershocks of the strong quake of August 2009 concentrated. The spatiotemporal behviour of the earthquake activity in the region suggests possible interaction between adjacent or intersecting regional faults.

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/content/papers/10.3997/2214-4609.201902652
2019-09-18
2024-04-19
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References

  1. Borisov, R.
    [2015] Seismicity of the Rhodope zone over the period 1980-2014 based on NOTSSI data, MSc thesis, “St. Kliment Okhridsky” University of Sofia (in Bulgarian).
    [Google Scholar]
  2. Botev, E., Solakov, D. and Christoskov, L.
    [2013] On the monitoring of the seismic activity in the territory of Bulgaria and surroundings. Bulgarian Geophysical Journal39, 59–69.
    [Google Scholar]
  3. Brownrigg, R. and Harte, D.
    [2005] Using R for statistical seismology. R News5(1), 31–35.
    [Google Scholar]
  4. Cao, A. and Gao, S.
    [2002] Temporal variations of seismic b-values beneath Northeastern Japan island arc. Geophysical Research Letters29(9), 10.1029/2001GL013775.
    https://doi.org/10.1029/2001GL013775 [Google Scholar]
  5. Christoskov, L. and Samardjieva, E.
    [1983] Investigation on the duration of the seismic signals like an energetic characteristic of the earthquakes. Bulgarian Geophysical Journal9 (1), 79–87 (in Bulgarian).
    [Google Scholar]
  6. Gardner, J. K., and L.Knopoff
    [1974] Is the sequence of earthquakes in Southern California, with aftershocks removed, Poissonian?Bulletin of the Seismological Society of America64(5), 1363–1367.
    [Google Scholar]
  7. Guidoboni, E., Comastri, A. and Traina, G.
    [1994] Catalogue of Ancient Earthquakes in the Mediterranean Area up to the 10th Century. Pub. 1st. Naz. Geofis. Vulcanol., Rome.
    [Google Scholar]
  8. Matova, M.
    [2000] Recent geological activity along the northeastern Bulgarian Black Sea coast. Geological Quarterly44(4), 355–361.
    [Google Scholar]
  9. Oaie, G., Seghedi, A. and Radulescu, V.
    [2016] Natural marine hazards in the Black Sea and the system of their monitoring and real-time warning, Geo-Eco-Marina22, 5–28.
    [Google Scholar]
  10. Ranguelov, B.
    [1996] Seismicity and tsunamis in the Black Sea. Proc. of the 25th ESC General Assembly, September 9–14, Reykjavik, Iceland, 667–673.
    [Google Scholar]
  11. [2008] Tsunamis in the Black Sea and some recent investigations. Natural Hazards in the Marine Area, International Symopsium, Bucharest, Romania, 21–23.
    [Google Scholar]
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