SPATIAL AND TEMPORAL CHANGES OF BLOCK STRUCTURE PREVAILING MOVEMENT TYPES OF JAVAKHETI HIGHLAND

K.S. Kazaryan1, V.Yu. Burmin2, A.M. Avetisyan1

1 Institute of Geophysics and Engineering Seismology named after academician A. Nazarov, National Academy  of Sciences of the Republic of Armenia, Gyumri, Armenia

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

Corresponding author: V.Yu. Burmin, e-mail: burmin@ifz.ru

Abstract. In the article focal mechanisms of earthquakes of Javakheti highland are made over the period 1971 to 2015, for individual time intervals, for periods between 1971–1973, 2001–2004, 2006–2009, 2010–2012 and 2013–2015. For making of mechanisms the method of average mechanisms was applied, in which Javakheti plateau earthquakes' data are used with variety of intensity by the distribution of P-waves' first income signs, then, comparing with the tectonic structure of the study region. On the boundaries of the active faults of the study area 5 blocks were allocated, with different directions of compression-tension forces pairs. The predominant types of movements in earthquake hypocenters in each selected block, for each time interval are revealed. The main characteristics of the focal mechanisms of earthquakes are investigated up to Paravani earthquake of 1986. It is established that before the strong Paravani earthquake there was a change of the predominant type of shifts from strike slip into thrust with slip component.

Keywords: earthquakes, focal mechanisms, nodal planes, block structure.

ABOUT THE AUTHORS:

KAZARYAN Karlen Surenovich – Candidate of Physical and Mathematical Sciences, Head of Laboratory, Science Researcher, Institute of Geophysics and Engineering Seismology named after academician A. Nazarov,  National Academy of Sciences of the Republic of Armenia. Armenia, 3115, Gyumri, V. Sargsyan st., 5. Tel.: (00374) 77 809-149. E-mail: g.karlen90@bk.ru

BURMIN Valery Yurievich – Doctor of Physical and Mathematical Sciences, Chief Researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1. Tel.: +7 (495) 254-68-95. E-mail: burmin@ifz.ru

AVETISYAN Andrei Mergevosovich – Doctor of Physical and Mathematical Sciences, Professor, Leading Researcher, Institute of Geophysics and Engineering Seismology named after Academician A. Nazarov, National Academy of Sciences of the Republic of Armenia. Armenia, 3115, Gyumri, V. Sargsyan st., 5. Tel.: (00374) 94 435-140. E-mail: avet.andrey@mail.ru

Cite this article as: Kazaryan K.S., Burmin V.Yu., Avetisyan A.M. Spatial and temporal changes of block structure prevailing movement types of Javakheti highland, Voprosy Inzhenernoi Seismologii (Problems of Engineering Seismology). 2019. V. 46, No. 3. P. 95–109 [in Russian]. https://doi.org/10.21455/VIS2019.3-6

English translation of the article will be published in Seismic Instruments, ISSN: 0747-9239 (Print) 1934-7871 (Online), https://link.springer.com/journal/11990