HOLOCENIC GEOLOGICAL AND SEISMIC ACTIVITY OF THE SYSTEM OF FAULTS IN NORTH-EAST BULGARIA BY THE COMPLEX OF GEOLOGICAL AND GEOMORPHOLOGICAL AND ARCHEOSEMOLOGICAL METHODS

© 2019    E.A. Rogozhin1*, A.V. Gorbatikov1, M.Yu. Stepanova1, Yu.V. Kharazova1,  
O.V. Dimitrov2, A.M.  Korzhenkov1, A.A. Strelnikov1 

1 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

2 Institute of Oceanology «Fridtjof Nansen», Bulgarian Academy of Sciences, Varna, Bulgaria

* e-mail: eurog@ifz.ru

Abstract. The structure of the fault system of northeastern Bulgaria and, in particular, of the Intramisian fault has been investigated in order to assess their current activity. Intramiziysky fault and offshooting its disjunctive known in Romania and Bulgaria, but not studied geological and geomorphological and seismological point of view. The authors conducted a complex of geophysical investigations, which gave an idea of their deep structure. The system of these faults is key to solving the problem of assessing the seismic hazard of the region, since recent studies of this area indicate the existence of traces of relatively young seismotectonic processes. There are also ideas that the zone of the two Intramizian faults violates the eastern part of the tectonic plate, which moves up under the Carpathian fold system in the region of the Vrancea Mountains. The article presents the results of a field study of the southeastern Bulgarian part of these fault systems using a complex of geological, geomorphological, paleoseismological and archeoseismological methods. On this basis, structural segmentation of the Intramisian fault zone was carried out and features of its intersection with the disjunctives of another structural orientation were revealed. Also discusses the data that determine the degree of its geological and seismic activity.

Keywords: seismotectonics, paleoseismology, geophysics, archeoseismology, geomorphology, faults, Bulgaria.

About the authors

ROGOZHIN Evgeny A. – Dr. Sci. (Geol.-Min.), professor, head of department, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya str., 10-1. Tel.: +7 (499) 254-87-15. E-mail: eurog@ifz.ru

GORBATIKOV Andrey V. – Cand. Sci. (Phys. and Math.), leading researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya str., 10-1. E-mail: avgor70@mail.ru

STEPANOVA Marina Yu. – Cand. Sci. (Phys. and Math.), senior researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya str., 10-1. E-mail: mars@sumail.ru 

KHARAZOVA Yulia V. – science researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya str., 10-1. E-mail: uh69@mail.ru 

DIMITROV Orlin V. – PhD (Geoph.), senior researcher, Institute of Oceanology «Fridtjof Nansen», Bulgarian Academy of Sciences. Bulgaria, 9000, Varna, Pervi May st., No. 40, PC 152. E-mail: ovdimitrov@io-bas.bg 

KORZHENKOV Andrey M. – Dr. Sci. (Geol.-Min.), head of laboratory, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya str., 10-1. Tel.: 8 (916) 226-90-92.  E-mail: korzhenkov@ifz.ru

STRELNIKOV Andrey A. – science researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya str., 10-1. E-mail: aas@ifz.ru

Cite this article as: Rogozhin E.A., Gorbatikov A.V., Stepanova M.Yu., Kharazova Yu.V.,  Dimitrov O.V., Korzhenkov A.M., Strelnikov A.A. Holocenic geological and seismic activity of the system of faults in North-East Bulgaria by the complex of geological and geomorphological and archeosemological methods, Geofizicheskie Protsessy i Biosfera (Geophysical Processes and Biosphere), 2019, vol. 18, no. 2, pp. 57–71 (in Russian). https://doi.org/10.21455/gpb2019.2-5

English version: Izvestiya, Atmospheric and Oceanic Physics, 2019, vol. 55, iss. 8. ISSN: 0001-4338 (Print), 1555-628X (Online).  https://link.springer.com/journal/volumesAndIssues/11485