SEISMICITY of NORTHERN EURASIA in 2016–2017

An overview of seismicity in 16 regions of Russia and neighboring countries in 2018–2019 is presented. Seismic monitoring of this territory was carried out by networks of seismic stations of Russia, Azerbaijan, Armenia, Belarus, Kazakhstan, Kyrgyzstan, Moldova, Turkmenistan, Tajikistan, Uzbekistan, Ukraine. In most regions, the seismic process occurred in the background. In Northern Eurasia as a whole, the total seismic energy in 2018 (Еan=17∙1016 J) remained unchanged compared to that for the previous year, and in 2019 fell to Еan=0.65∙1016 J, with annual values of released energy for 2018 and 2019 were significantly lower than its average annual level for the period 2006–2017. (Еan=5.3∙1016 J). The “Angular Uplift earthquake” on December 20, 2018 at 17h01m with MS=7.4 (MwGCMT=7.2), localized in the surface layer of the seismofocal zone of the Commander segment of the Aleutian arc with the epicenter in the Pacific Ocean was the strongest for the period 2018– 2019. Maximum shaking intensity on the tyerritory of Northern Eurasia (I=6–7) was caused by earthquake on July 6, 2018 at 01h40m with MwGCMT=6.2, h=75 km in the seismofocal zone of the Kuril Islands–Southern Kamchatka and Katav-Ivanovsk earthquake on September 4, 2018 at 22h58m in the Chelyabinsk oblast (Ural and Western Siberia region). The Katav-Ivanovsk earthquake is also unique in that it was accompanied by a significant number of aftershocks, which is the first known case for tectonic events within the Urals. In addition, it demonstrated that the natural seismic potential of the Urals exceeds the man-made component by orders of energy

SEISMICITY of NORTHERN EURASIA in 2018–2019

Malovichko,

Petrova,

Gabsatarova

et al. 2023

SEISMICITY of NORTHERN EURASIA in 2020

Malovichko,

Petrova,

Levina

et al. 2024

In 2020, monitoring of seismicity in Northern Eurasia, consisting of 16 regions of Russia and neighboring countries, was carried out by networks of seismic stations in Russia, Azerbaijan, Armenia, Belarus, Kazakhstan, Kyrgyzstan, Moldova, Tajikistan, Turkmenistan, Uzbekistan and Ukraine. In total, the networks included 675 digital, two analogue stations and eight seismic groups. Based on regional catalogs, a consolidated catalog of earthquakes in Northern Eurasia, containing 28,348 tectonic earthquakes, was created. About 21 thousand of them are located in the earth’s crust (h<70 km), more than 7 thousand are at intermediate depths (h=70–300 km), and only 90 are at depths greater than 300 km. In most regions, the seismic process occurred in the background. The total seismic energy released in the specified territory in 2020 (Ean=3.42∙1016 J) was lower than the average annual level for the previous period 2006–2019 (Ean=4.83∙1016 J), but significantly exceeded the energy for 2019 (Ean=0.62∙1016 J).

SEISMICITY of the RUSSIAN PART of EAST EUROPEAN PLATFORM and ADJACENT TERRITORIES in 2020

Noskova,

Gabsatarova,

Baranov

et al. 2024

On the Russian territory of the East European Platform, seismic observations were carried out by 47 stationary seismic stations. In 2020, 36 seismic events of tectonic and technogenic-tectonic nature were registered. As before, weak natural and man-made seismicity was recorded on the territory of the Voronezh crystalline massif and the Baltic Shield: in Karelia, border areas with Finland, near the Kandalaksha Bay, within the Khibiny, Kovdor massifs and in the Vite-Guba area of Imandra lake on the Kola Peninsula. A feature of seismicity in 2020 is the occurrence of earthquakes in the paleorift structures of the northeast of the East European Platform: in the Kirov Kazhim and Central Russian aulacogens. The total volume of seismic energy released in 2020 is Е=7.16·109 J, which is 2 times lower than in 2019, but 2 times more than the energy released in 2018.