Problems of Engineering Seismology: article

Optimal configuration of the Karelia seismological network
V.Yu. Burmin
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
Journal: Problems of Engineering Seismology
Tome: 49
Number: 4
Year: 2022
Pages: 117-129
UDK: 550.312
DOI: 10.21455/VIS2022.4-8
Keywords: Karelia, seismic stations, efficiency of observation systems, optimal network configuration, earthquake magnitude
Аnnotation: The modern seismological network of Karelia consists of four seismic stations. The number of network stations is small, and they are unevenly distributed over the territory of Karelia. Therefore, the Karelian seismological network is not efficient enough, and seismic events (earthquakes and quarry blasts) of different minimum magnitudes and with different accuracy are recorded at different points on the territory. In order for events occurring in different points of Karelia to be recorded with the same accuracy and the same minimum magnitude, it is necessary to arrange the seismic stations of the system more evenly throughout the territory, i.e. the observing system must have an optimal configuration. The calculation of the minimum magnitudes of recorded seismic events for the optimal seismological network of Karelia from 65 new and 4 currently functioning seismic stations shows that with an amplification in registration channels of 50,000, the network will reliably record earthquakes with a magnitude of 1.0 or more throughout Karelia. At the same time, the position of the seismic stations of the optimal network on the territory of Karelia is determined up to a parallel shift and arbitrary rotation of the entire observation system. The values of errors in determining the coordinates of earthquake epicenters in latitude and longitude within the network will not exceed 0.5 km. The values of errors in determining the depths of earthquake sources recorded by the system throughout the territory of Karelia do not exceed 1.0 km in the center of the network and can reach 2.0 km only on its periphery.