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COMPARISON OF SEISMICITY AND AVERAGE FOCAL MECHANISMS OF JAVAKHETI HIGHLAND EARTHQUAKES WITH REGIONAL GRAVITATIONAL FIELD ANOMALIES
1 Institute of Geophysics and Engineering Seismology named after academician A. Nazarov, National Academy of Sciences of the Republic of Armenia
2 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
2 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
Journal: Geophysical processes and biosphere
Tome: 19
Number: 4
Year: 2020
Pages: 117-126
UDK: 550.312
DOI: 10.21455/GPB2020.4-8
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KAZARYAN K.S., BURMIN V.Y., AVETISYAN A.M. COMPARISON OF SEISMICITY AND AVERAGE FOCAL MECHANISMS OF JAVAKHETI HIGHLAND EARTHQUAKES WITH REGIONAL GRAVITATIONAL FIELD ANOMALIES // . 2020. Т. 19. № 4. С. 117-126. DOI: 10.21455/GPB2020.4-8
@article{KAZARYANCOMPARISON2020,
author = "KAZARYAN, K. S. and BURMIN, V. Y. and AVETISYAN, A. M.",
title = "COMPARISON OF SEISMICITY AND AVERAGE FOCAL MECHANISMS OF JAVAKHETI HIGHLAND EARTHQUAKES WITH REGIONAL GRAVITATIONAL FIELD ANOMALIES",
journal = "Geophysical processes and biosphere",
year = 2020,
volume = "19",
number = "4",
pages = "117-126",
doi = "10.21455/GPB2020.4-8",
language = "English"
}
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Keywords: seismicity, earthquakes, block structure, gravitational field, Bouguer reduction
Аnnotation: The article provides a comparative analysis of the anomalies in the values of the regional gravity field with the spatial distribution of the earthquake epicenters in the Javakheti Highland. It is shown that the epicenters of earthquakes with magnitudes M ≥ 4 are confined to the gradient zones, where significant relative minima and maxima of the anomalies of the gravitational field in the Bouguer reduction are observed. The average mechanisms of earthquakes in individual seismogenic blocks of the region were obtained for the observation period from 1971 to 2015, which indicate that normal faulting is the dominant type of movements in the earthquake foci. The result is explained by the processes occurring in the subcrustal layer and leading to decompaction of matter in the uplift zones, which is one of the main factors in the occurrence of negative gravity anomalies in the area under consideration.
