Abstract

On September 16, 2020, an earthquake was registered in the Slobodskoi district of Kirov Oblast. The instrumental data were processed on the basis of seismograms from 11 stations with epicentral distances from 69 to 660 km that cover the azimuthal range of 1.4°–322.8°, GAP = 124°. The earthquake is classified as a tectonic one and has the following parameters: coordinates 58.755° N, 50.588° E; time in the source t₀ = 01:04:44 (UTC); depth h = 6 km; energy class, after T.G. Rautian, K_P = 9.4; M_L = 3.2, and M_S = 2.4; the error ellipsis parameters are Az_Major = 20°; R_Minor = 4.5 km, R_Major = 7.3 km. The event was not felt by residents of the nearby localities, probably due to the fact that the seismic event was of low magnitude and occurred at night. In terms of tectonics, the earthquake of September 16, 2020 was confined to the Kirov–Kazhim aulacogen, which is, in turn, is located within the Volga-Ural anteclise of the Russian plate of the East European platform (EEP). Historical earthquakes are known near the epicentral area of the event, as well as instrumental ones with M_L = 2.6–3.4. The Verkhoshizhemskoe earthquake of 2000 with I = V and two earthquakes with I = VII (1939 Sysola and 1897 Vyatka events) with documented macroseismic manifestations are the remarkable major events in the study area. Earthquakes occur mainly at the sides of the aulacogen and are probably confined to the northeast-trending faults that control the most submerged central graben of the aulacogen. The occurrence of seismic events within the EEP indicates that it is a fairly mobile structure, especially in its marginal parts.

中文翻译：

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2020年9月16日在基洛夫–卡兹姆·奥拉金根发生的地震

摘要

2020年9月16日，基洛夫州的Slobodskoi地区发生了地震。仪器数据是根据11个台站的地震图进行处理的，震中距离为69至660 km，覆盖的方位角范围为1.4°–322.8°，GAP = 124°。地震被列为构造性地震，具有以下参数：坐标58.755°N，50.588°E；源中的时间t ₀ = 01:04:44（UTC）; 深度h = 6 km; TG Rautian之后的能量等级，K _P = 9.4；M _L = 3.2，M _S = 2.4；误差省略号参数为Az _Major = 20°；_小R = 4.5公里，R _Major = 7.3公里。附近地区的居民没有感觉到该事件，这可能是由于地震事件的强度很低并且发生在晚上。在构造方面，2020年9月16日的地震仅限于基洛夫-卡兹姆aulacogen，而后者位于东欧平台（EEP）俄国板块的伏尔加河-乌拉尔斜坡。地震的震中附近是已知的历史地震，而M _L = 2.6–3.4的仪器地震是已知的。2000年与Verkhoshizhemskoe地震我= V和两个地震带我= VII（1939年Sysola和1897年Vyatka事件）具有记录的大地震表现是该研究区域中显着的重大事件。地震主要发生在震源的两侧，可能仅限于控制震源最深的中央central陷的东北向断裂。EEP内地震事件的发生表明它是一个相当可移动的结构，尤其是在其边缘部分。