Seismic monitoring in the region in 2015 was carried out by a seismic network consisting of 59 stations. Digital equipment was installed at all stations in the second half of the year. The network capability was assessed by the level of seismic noise at the stations: in most of the region, the network provided registration of an earthquake from КR7.0, in the central (including the Greater Sochi region) and eastern parts of the region – КR6.0, and in some local zones with КR5.5. 2,276 earthquakes were registered, 17 earthquakes were felt in the settlements of the Caucasus. The maximum intensity VII at MSK-64 (SSI-17) scale was noted from the earthquake in the territory of Azerbaijan. The earthquake on November 3, which occurred on the platform territory within the Stavropol arch, felt IV at MSK-64. The strongest earthquakes were recorded in the Terek-Caspian and Kura troughs and in the eastern part of the Greater Caucasus. The seismicity of the North Caucasus in 2015 in accordance with the seismicity scale "SOUS-09" was set as the "background average" for the observation period from 1962 to 2015.
North-Ossetian Division of the Geophysical Survey of the Russian Academy of Sciences (NOD GS RAS) carries out the continuous seismological observations of the central part of the North Caucasus region. The branch's seismological network includes 12 observation points located on the territory of the Republic of North Ossetia-Alania. The paper provides basic information about the places of installation of seismic stations and their equipment, and notes the registration possibilities of the network. The total number of registered seismic events and separately within the administrative territories in 2020 is given. The total released seismic energy is calculated. A comparison of the energy indicator with the previous year is given. The schedule of repeatability is calculated and constructed, which indicates the level of reliability of event registration. The analysis of the earthquakes foci distribution with ref-erence to geotectonic structures is presented on the map of the epicenters of recorded seismic events with an indication of the distribution against the background of the focal zones. Iden-tified and described the swarm sequences of seismic events, which occurred in the territories of the Republics of North Ossetia-Alania and Kabardino-Balkaria, as well as in the Stavropol Territory. The mechanisms of the foci for the three most powerful earthquakes are deter-mined and their stereograms are given. The obtained results will allow us to study the chang-es in the seismic regime of the North Caucasus region more effectively.
In 2014 a seismic network consisting of 60 stations, 57 of which were equipped with digital equipment, operated in the region. 1695 earthquakes and 63 explosions in industrial quarries were recorded within the region boundaries. In the settlements of the Caucasus, 21 earthquakes were felt. The maximum intensity did not exceed Imax=4 on the MSK-64 (SIS-17) scale. Such intensity was observed from earthquakes in the territories of Ingushetia–Chechnya and Azerbaijan. The aftershock process of the strong East Black Sea earthquake on December 23, 2012 (Мw=5.8) off the coast of Abkhazia continued. In 2014 about a hundred earthquakes with KP=5.3–9.5 were recorded. In the central part of Azov sea, two earthquakes with KP=9.9 and 7.4 were recorded in January and December. The earthquakes with intermediate depths in the Tersko-Caspian trough (Tersko-Sunzhenskaya zone) with КР> 9.5 were not recorded. Two strong earthquakes with KP=12 and intermediate depths occurred in the Kurin Depression of Azerbaijan and in the Caspian Sea. A swarm of weak earthquakes with КР=5.7–8.8 was recorded on December 13–15 in the Black Sea near Tuapse. In 2014 the most part of the earthquakes were recorded in the Tersko-Caspian and Kurin troughs, in the eastern part of the Greater Caucasus. According to the level of energy released, the seismicity of the territory of the North Caucasus in 2014 was characterized in accordance with the “SOUS-09” seismicity scale as “background average” for the observation period from 1962 to 2014.
Seismic monitoring in the region was produced by a seismic network of 58 stations in 2016 and 60 stations in 2017. All stations were digitally equipped. The seismic network provided representative registration of earthquakes with KR≥7.0 in most of the region, in the central (including the Greater Sochi region) and eastern parts of the region – with KR≥6.0, and in some local zones with KR≥5.5. In general, 5594 earthquakes have been recorded in the region and its environs. 66 earthquakes were felt in the Caucasus settlements, 24 of them occurred in the North Caucasus region. The maximum shaking intensity, Imax=6 by the MSK-64 scale, was noted at the March 6, 2017 earthquake with KR=10.9 occurred in the territory of the Chechen Republic. August 7, 2016 earthquake in the Azov Sea, not far from Mariupol, was felt up to I=5. The strongest and most perceptible earthquakes were registered in Dagestan (in the tectonic regions of the Greater Caucasus and the Dagestan wedge). In accordance with the seismicity level scale "SOUS-09", seismicity of the North Caucasus in 2016–2017 is set as a "background average" for the observation period from 1962 to 2017.
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