Seismic Intensity Estimates for the Baikal–Olekma Section of the Baikal–Amur Railway

IF 0.9 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Russian Journal of Pacific Geology Pub Date : 2024-08-09 DOI:10.1134/s181971402470012x

V. I. Melnikova, N. A. Gileva, Ya. B. Radziminovich, A. I. Filippova

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Abstract

In this study, we calculated the seismic intensity for the Baikal–Olekma section of the Baikal–Amur Railway based on data on seismicity on the northeastern flank of the Baikal Rift Zone in 1985–2021. During the analysis of earthquakes with an epicentral intensity higher than 4 (1484 events), we selected 270 earthquakes with Ms = 2.1–6.6, whose calculated intensity exceeded 4 points directly on the railway track from the total number of the recorded seismic events (more than 150 000 earthquakes with M ≥ 1.0). The highest intensity values (8–9) were obtained for large earthquakes close to the Baikal–Olekma section of the Baikal–Amur Railway (Δ < 10 km, Ms = 6.1–6.2). A recurrence interval of such seismic events along the considered section of the railway is 20–60 years. The data are agree well with the macroseismic data available, which confirms the correctness of the results. At the same time, macroseismic effects from strong (Ms ≥ 6.6) but remote earthquakes (Δ = 360–1000 km) were found to have no significant impact on the Baikal–Olekma section of the Baikal–Amur Railway. The calculated values of intensity and recurrence intervals of earthquakes should be taken into account when designing, constructing, and operating industrial and civil infrastructure within the study area.

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贝加尔-阿穆尔铁路贝加尔-奥列克马段地震烈度估算

摘要在本研究中，我们根据 1985-2021 年贝加尔裂谷带东北侧的地震数据，计算了贝加尔-阿穆尔铁路贝加尔-奥廖克马段的地震烈度。在对震中烈度大于 4 的地震（1484 次）进行分析时，我们从记录的地震事件总数（超过 15 万次 M≥1.0 的地震）中选取了 270 次 Ms = 2.1-6.6 的地震，其计算烈度超过 4 点，直接位于铁路轨道上。贝加尔-阿穆尔铁路贝加尔-奥列克马段附近的大地震（Δ < 10 km, Ms = 6.1-6.2）强度值最高（8-9）。该铁路路段的地震重现间隔为 20-60 年。这些数据与现有的宏观地震数据非常吻合，证实了结果的正确性。同时，强震（Ms ≥ 6.6）但偏远地震（Δ = 360-1000 千米）的宏观地震效应对贝加尔-阿穆尔铁路的贝加尔-奥廖克马路段没有明显影响。在设计、建设和运营研究区域内的工业和民用基础设施时，应考虑地震烈度和重现间隔的计算值。

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来源期刊

Russian Journal of Pacific Geology 地学-地球科学综合

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Russian Journal of Pacific Geology publishes the results of research on the Earth crust and mantle composition and provides articles on the geological structure and patterns of distribution of mineral deposits in the Pacific Ocean, marginal seas and continental margins. It discusses the topics of stratigraphy, sedimentology, magmatic activity, and seismicity. The journal deals with the problems of lithosphere plates tectonics, and offers the results of neotectonic, geomorphological, geodesic, environmental and mining studies in the Pacific region. The journal accepts theoretical, methodical and philosophical articles covering general issues of geology, geophysics, geochemistry, geoecology and mining. The journal also publishes critical notes and comments, and reviews.