Spectral Characteristics of Ambient Noise and Shear Waves of Earthquakes in the Baikal Rift Zone

IF 0.3 Q4 GEOCHEMISTRY & GEOPHYSICS

Seismic Instruments Pub Date : 2025-03-24 DOI:10.3103/S074792392570001X

Ts. A. Tubanov, A. N. Besedina, P. A. Predein

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Abstract

Comparison of the spectral characteristics of ground vibrations from earthquakes with the level of seismic ambient noise in a wide range of periods makes it possible to assess the possibilities of seismic networks, taking into account the local conditions for the location of seismic stations. Based on the probabilistic approach, which allows one to estimate the statistical parameters of seismic variations in the frequency domain, a model of seismic ambient noise for the southeastern shore of Lake Baikal was developed. The study of the spectral characteristics of seismic waves was carried out on the basis of records of earthquakes in the Baikal rift zone with 3.5 ≤ M ≤ 6.9 that occurred during 2017–2022. The spectral characteristics of shear waves from earthquakes were calculated using bandpass filtering in nonoverlapping octave bands. Comparison of the calculated spectral characteristics of seismic vibrations from earthquakes with seismic ambient noise model made it possible to evaluate the possibilities of three broadband seismic stations. The approach can be used to select optimal equipment in terms of its characteristics, taking into account the local conditions for the location of stations.

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贝加尔裂谷区环境噪声和地震剪切波的频谱特征

将地震地面振动的频谱特征与大范围周期内的地震环境噪声水平进行比较，可以在考虑地震台站位置的当地条件的情况下，评估地震台网的可能性。基于概率方法，可以在频域估计地震变化的统计参数，建立了贝加尔湖东南岸地震环境噪声模型。以2017-2022年贝加尔湖裂谷带3.5≤M≤6.9级地震记录为基础，开展了地震波频谱特征研究。在非重叠的倍频带中，采用带通滤波方法计算了地震横波的频谱特征。将计算得到的地震振动频谱特征与地震环境噪声模型进行比较，可以评估三个宽带地震台站的可能性。该方法可用于根据设备的特性选择最佳设备，同时考虑到站点位置的当地条件。

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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.