[S13-2] Earthquake source mechanics II

[S13-2-05] Induced seismicity of Kuzbass (Russia). Bachatskoe earthquake of 2013, ML=6.1

^○Aleksey Emanov^{1, 2}, Aleksandr Emanov^{1, 3}, Ekaterina Leskova^1,2, Aleksandr Fateev^1,2 (1.Altai-Sayan Branch of Geophysical Survey of Russian Academy of Sciences, Novosibirsk, Russian Federation, 2.Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation, 3.Novosibirsk State University, Novosibirsk, Russian Federation)

The Kuznetsk coal basin (Kuzbass) is one of the largest coal deposits in the world, located in the South of Western Siberia in Russia. The territory of Kuzbass has always proved itself as a district with rare large earthquakes and a moderate seismicity, much of which is concentrated in mountainous framing of the Kuznetsk basin. But a special study of induced seismicity was not carried out until the beginning of the century because of the sparse network of seismic stations here. Only in recent years in connection with the development of a network of seismic monitoring stations in the Kuzbass and conducting several observations using temporary networks of seismic stations has been shown the existence of induced seismicity. At the moment, the basis of the system of monitoring induced seismicity with 11 additional stations on the territory of Kuzbass is created. The system works in real time and allows tracking the appearance and the development of dangerous human induced seismic processes formed around mines and quarries. According to registrations of the system shown the induced seismicity in the Kuzbass significantly dominates over the natural seismicity.
In addition, a strong earthquake with ML=6.1 occurred on the 18th of June, 2013 near one of the largest open pits of the Kuznetsk basin (Bachatskiy). As a result of studies using temporary seismic stations in the epicentral area of the Bachatskoe earthquake was found that the seismic process area is closely connected to an open mine workings, and earthquakes are extended in the depth from the cut bed up to 4-5 km. Seismic regime of induced activation is continuous and not stationary. The orientation of the nodal planes of Bachatskoe earthquake focal mechanism corresponds to the direction of technogenic impact. The findings suggest that Bachatskoe earthquake and associated activation are induced earthquakes with a fairly large energy.