Strong Earthquakes in the Northern Baikal Region in 2016–2017 (МW = 5.0 and МW = 4.8)

IF 0.3 Q4 GEOCHEMISTRY & GEOPHYSICS Seismic Instruments Pub Date : 2023-01-10 DOI:10.3103/S074792392206010X

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

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Abstract

This paper presents the results of a detailed study of two relatively strong seismic events, occurred on November, 22, 2016 (М_W = 5.0) and April 3, 2017 (М_W = 4.8) at the northeastern flank of the Baikal rift zone in the areas of the South Muya and Kalar ranges. Both the events were followed by weak aftershocks (N = 178–539, К_р ≤ 11.0), whose epicenters were densely distributed over an area. The seismic moment tensors and hypocentral depths of the mainshocks were calculated from surface wave amplitude spectra. It has been shown that their sources were formed under the influence of the subhorizontal SE–NW extension and the subhorizontal or inclined NE–SW compression. Both the earthquakes were followed by noticeable macroseismic effects at epicentral distances up to 500 km. In the area of the Baikal−Amur Railway, their shaking intensity was IV–V MSK-64. The results obtained can be used in continuous seismic monitoring at the northeastern flank of the Baikal rift zone and can contribute to an objective seismic hazard assessment of the study area.

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2016-2017年北贝加尔湖地区强震(МW = 5.0， МW = 4.8)

本文详细研究了2016年11月22日(МW = 5.0)和2017年4月3日(МW = 4.8)发生在南木亚山脉和卡拉尔山脉贝加尔湖裂谷带东北侧的两次较强地震事件。两次地震后均发生弱余震(N = 178-539， Кр≤11.0)，震源密集分布。利用表面波振幅谱计算了主震的地震矩张量和震源深度。研究表明，它们的来源是受次水平东—北西向伸展和次水平或倾斜的ne—sw挤压作用的影响。两次地震之后，震中距离达500公里的地方都有明显的宏观地震效应。在贝加尔湖-阿穆尔河铁路区域，它们的震动强度为IV-V MSK-64。所得结果可用于贝加尔湖裂谷带东北侧翼的连续地震监测，并有助于对研究区进行客观的地震危险性评价。

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Seismic Instruments GEOCHEMISTRY & GEOPHYSICS-

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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.