Abstract

We present an analysis of spectral content for three large earthquakes which occurred in the Baikal–Mongolia region, for hard soils in Irkutsk and Ulaanbaatar cities. The earthquakes were recorded from the same seismic source zones (SSZ) in 2020 and in 2021. We used accelerograms, frequency characteristics of upper soil layers, and ground motion spectra to describe and analyze the behavior of the earth at recording sites. We estimated variations in the spectral content of the large earthquakes, and their records were used to set up a common basic signal with due account of the SSZ for soils of the first category in Irkutsk and Ulaanbaatar. The results of this analysis provide the basis for future prediction of seismic effects due to large earthquakes in the Baikal–Mongolia region.

中文翻译：

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2020-2021 年伊尔库茨克和乌兰巴托记录的贝加尔-蒙古地区大地震的光谱分析

摘要

我们对发生在贝加尔-蒙古地区的三场大地震的频谱内容进行了分析，这些地震针对伊尔库茨克和乌兰巴托城市的硬土。地震是在 2020 年和 2021 年从同一震源区 (SSZ) 记录的。我们使用加速度图、上土层的频率特征和地震动谱来描述和分析记录地点的地球行为。我们估计了大地震的光谱内容的变化，并且它们的记录被用来建立一个共同的基本信号，并适当考虑了伊尔库茨克和乌兰巴托第一类土壤的 SSZ。该分析结果为未来预测贝加尔-蒙古地区大地震造成的地震影响提供了依据。