Seismic instruments: article

ESTIMATION OF THE EFFECTIVENESS OF SEISMOLOGICAL NETWORKS IN ARMENIA
V.Y. BURMIN1
A.M. AVETISYAN2
K.S. KAZARYAN2
1 Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences
2 Institute of Geophysics and Engineering Seismology named after Academician A. Nazarov NAS of RA
Journal: Seismic instruments
Tome: 55
Number: 2
Year: 2019
Pages: 39-47
UDK: 550.34
DOI: 10.21455/si2019.2-3
Аnnotation file
Bibliographic list
Keywords: Armenia, seismic stations, effectiveness of observing systems, energy class, magnitude, hypocenter
Аnnotation: For a successful prediction of strong earthquakes, seismic zoning and earthquake-resistant construction, it is necessary, first of all, to have a fairly clear idea of the distribution of earthquake hypocenters in the study area. In order to determine the position of earthquake foci with high accuracy, it is necessary to have a system of observations that could provide this high accuracy. A modern seismological network in the territory of the Republic of Armenia (RA) consists, essentially, of two independent networks that practically do not interact with each other. In addition, each network uses its own data processing techniques (methods for determining hypocenters, hodographs). One network belongs to the National Seismic Protection Service under the Ministry of Emergency Situations of the Republic of Armenia (NSSS RA) and consists of 16 stations, and the other is subordinated to the Institute of Geology of the NAS RA (IG NAS RA) and contains 14 seismic stations. Both networks of seismic stations are not evenly distributed in the territory of Armenia and each of them has its drawbacks. The IGN NAS RA network is far between (only 14 stations) and its stations are located only in the northwestern part of Armenia. Therefore, it does not allow sufficiently accurately locating earthquake hypocenters throughout the country. The network of the NSSP of RA consists of 16 stations, but they are not evenly distributed throughout the territory of Armenia, but at the same time, they capture the southeastern part of the territory of Armenia. Calculations have been made and maps of the distribution of minimum energy classes and maximum errors of determining the coordinates of earthquake hypocenters, which are recorded both separately by the networks of the IG NAS RA and NSSS RA, and the combined network of seismic stations, have been constructed. It is shown that when networks are combined, the localization of earthquake hypocenters is somewhat improved, but the area between the northwestern and southeastern parts of Armenia remains virtually uncovered. This is due to the fact that currently the stations of both existing networks, on the one hand, in some cases overlap, and on the other, are unevenly distributed throughout the territory. To obtain more accurate and reliable in-formation, it is better to have a single network of observations, the stations of which would be evenly located throughout the republic.