The September 21, 2020 (Mw = 5.6) Bystraya Earthquake at the South-Western Flank of the Baikal Rift Zone: a Milestone in Macroseismology of Eastern Siberia

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Izvestiya, Physics of the Solid Earth Pub Date : 2024-11-22 DOI:10.1134/S1069351324700861

Ya. B. Radziminovich, A. V. Novopashina, O. F. Lukhneva, N. A. Gileva, E. A. Kuz’mina

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Abstract

The article presents analysis of macroseismic data on the September 21, 2020 (M_w = 5.6) Bystraya earthquake, which occurred in the eastern part of the Tunka basins system on the southwestern flank of the Baikal rift zone. Macroseismic data were collected mainly through an Internet questionnaire posted on the website of the Baikal Branch of the Geophysical Survey, Russian Academy Sciences. A total of 3013 eyewitness responses were collected, which is currently an unprecedented number in the entire history of macroseismic observations in the Baikal region. In total, we collected data for 263 Intensity Data Points. The maximal shaking intensity (VI–VII MSK-64) was observed in the Bystraya village and the Kultuk settlement. The shaking intensity V MSK-64 was noted at a distance of up to ~180 km; intensity IV MSK-64 was recorded at a distance of up to ~550 km. Analysis of data on the Bystraya earthquake revealed significantly lower attenuation compared to that expected from the regional macroseismic equation. Due to the large volume of macroseismic data collected, as well as the high efficiency of the data collection method used, the Bystraya earthquake can be considered an important milestone in macroseismic research in East Siberia.

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贝加尔裂谷带西南侧 2020 年 9 月 21 日（Mw = 5.6）Bystraya 地震：东西伯利亚宏观地震学的里程碑

文章介绍了对 2020 年 9 月 21 日（Mw = 5.6）Bystraya 地震宏观地震数据的分析，该地震发生在贝加尔断裂带西南侧通卡盆地系统的东部。宏观地震数据主要是通过俄罗斯科学院地球物理勘测贝加尔分院网站上发布的网络问卷收集的。共收集到 3013 份目击者答复，这在贝加尔湖地区宏观地震观测的整个历史上都是前所未有的。我们总共收集了 263 个强度数据点的数据。在 Bystraya 村和 Kultuk 聚居区观测到了最大摇晃强度（VI-VII MSK-64）。距离约 180 千米的地方出现了 V 级 MSK-64 地震烈度；距离约 550 千米的地方出现了 IV 级 MSK-64 地震烈度。对 Bystraya 地震数据的分析表明，与区域宏观地震方程预期的衰减相比，衰减明显较低。由于收集到了大量的宏观地震数据，以及所使用的数据收集方法的高效性，Bystraya 地震可被视为东西伯利亚宏观地震研究的一个重要里程碑。

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

Izvestiya, Physics of the Solid Earth 地学-地球化学与地球物理

CiteScore

1.60

自引率

30.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.