Kudara Earthquake of September 12, 2020 (MW = 5.5) on Lake Baikal: Results of Instrumental and Macroseismic Observations

IF 0.3 Q4 GEOCHEMISTRY & GEOPHYSICS

Seismic Instruments Pub Date : 2022-02-01 DOI:10.3103/S0747923922010108

Ts. A. Tubanov, D. P.-D. Sanzhieva, E. A. Kobeleva, P. A. Predein, L. R. Tcydypova

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引用次数: 4

Abstract

The article discusses the results of processing instrumental and macroseismic observations of the strongest earthquake in Central Baikal in the last 60 years, which occurred on December 9, 2020 (M_W = 5.5), as well as its aftershocks. The event was named the Kudara earthquake, after the locality where the maximum intensity of shocks was recorded. The epicenter of the main shock is confined to Proval Bay (Lake Baikal), which formed as a result of the catastrophic Tsagan earthquake of 1862. The sufficiently high density of seismic stations in the region allowed us to obtain reliable estimates of the position of epicenters and source depths for the main shock and aftershocks. In total, more than 70 earthquakes were recorded, located within an area extending in the sublatitudinal direction. The strongest aftershock (K_R = 12.6) occurred to the west of the main source on the first day after the main shock. To estimate the seismic moment and focal spectrum of the earthquake, the coda envelope inversion method was tested. The moment magnitudes for the main shock and three aftershocks have been obtained.

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2020年9月12日贝加尔湖库达拉地震(MW = 5.5):仪器和宏观地震观测结果

本文讨论了2020年12月9日贝加尔湖中部发生的60年来最强烈的地震(MW = 5.5)及其余震的处理仪器和宏观地震观测结果。这次地震被命名为库达拉地震，这是记录到最大地震强度的地方。主震的震中局限于普罗瓦尔湾(贝加尔湖)，它是由1862年灾难性的察甘地震形成的。该地区地震台站的密度足够高，使我们能够获得可靠的震中位置和主震和余震震源深度估计。总共记录了70多次地震，这些地震位于沿次纬度方向延伸的区域内。在主震发生后的第1天，震源以西发生了最强余震(KR = 12.6)。为了估计地震的地震矩和震源谱，试验了尾线包络反演方法。获得了主震和三次余震的矩震级。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Seismic Instruments GEOCHEMISTRY & GEOPHYSICS-

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44.40%

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期刊介绍： Seismic Instruments is a journal devoted to the description of geophysical instruments used in seismic research. In addition to covering the actual instruments for registering seismic waves, substantial room is devoted to solving instrumental-methodological problems of geophysical monitoring, applying various methods that are used to search for earthquake precursors, to studying earthquake nucleation processes and to monitoring natural and technogenous processes. The description of the construction, working elements, and technical characteristics of the instruments, as well as some results of implementation of the instruments and interpretation of the results are given. Attention is paid to seismic monitoring data and earthquake catalog quality Analysis.