Microseisms of Lake Baikal Based on Regional Seismic Network Data

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Izvestiya, Physics of the Solid Earth Pub Date : 2024-07-18 DOI:10.1134/S106935132470040X

A. N. Besedina, Ts. A. Tubanov, P. A. Predein, D. P.-D. Sanzhieva, G. N. Ivanchenko

{"title":"Microseisms of Lake Baikal Based on Regional Seismic Network Data","authors":"A. N. Besedina, Ts. A. Tubanov, P. A. Predein, D. P.-D. Sanzhieva, G. N. Ivanchenko","doi":"10.1134/S106935132470040X","DOIUrl":null,"url":null,"abstract":"<p><b>Abstract</b>—Peculiarities of microseismic ambient noise are studied based on the data from the stations of regional seismic network located in the central part of the Baikal rift. The probabilistic approach is used to thoroughly investigate the pattern of diurnal variations in microseisms and to analyze the amplitude level and frequency content of the spatial anomalies and the temporal changes (seasonal and annual). Based on the 2020–2021 data, a regional probabilistic model of the microseismic noise is built in a wide range of periods. The study of microseisms in the frequency band of about 1 Hz revealed a seasonal anomaly against the level of the global minimum in the microseismic noise power spectrum. The anomaly is observed from May to December at seismic stations surrounding Lake Baikal except for its northern part. The back azimuth direction in the frequency range of about 1 Hz indicates the arrivals from the location of the lake, suggesting that these signals can be identified as lake-generated microseisms. The high values of the coherence function testify to a linear relation between the wind velocity and the occurrence of lake microseisms. The detailed analysis of the spectral and polarization parameters of the seismic ambient noise revealed two types of lake-generated microseisms with frequencies of 0.4–0.7 and 0.7–1.5 Hz. The first frequency interval is likely to correspond to the single-frequency lake-generated microseisms, while the second interval covers the frequency ranges of the dual-frequency microseisms.</p>","PeriodicalId":602,"journal":{"name":"Izvestiya, Physics of the Solid Earth","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Izvestiya, Physics of the Solid Earth","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1134/S106935132470040X","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract—Peculiarities of microseismic ambient noise are studied based on the data from the stations of regional seismic network located in the central part of the Baikal rift. The probabilistic approach is used to thoroughly investigate the pattern of diurnal variations in microseisms and to analyze the amplitude level and frequency content of the spatial anomalies and the temporal changes (seasonal and annual). Based on the 2020–2021 data, a regional probabilistic model of the microseismic noise is built in a wide range of periods. The study of microseisms in the frequency band of about 1 Hz revealed a seasonal anomaly against the level of the global minimum in the microseismic noise power spectrum. The anomaly is observed from May to December at seismic stations surrounding Lake Baikal except for its northern part. The back azimuth direction in the frequency range of about 1 Hz indicates the arrivals from the location of the lake, suggesting that these signals can be identified as lake-generated microseisms. The high values of the coherence function testify to a linear relation between the wind velocity and the occurrence of lake microseisms. The detailed analysis of the spectral and polarization parameters of the seismic ambient noise revealed two types of lake-generated microseisms with frequencies of 0.4–0.7 and 0.7–1.5 Hz. The first frequency interval is likely to correspond to the single-frequency lake-generated microseisms, while the second interval covers the frequency ranges of the dual-frequency microseisms.

Abstract Image

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

基于区域地震网络数据的贝加尔湖微地震

摘要--根据贝加尔裂谷中部地区地震网络台站的数据，研究了微地震环境噪声的特殊性。采用概率方法深入研究了微地震的昼夜变化模式，分析了空间异常的振幅水平和频率内容以及时间变化（季节和年度）。根据 2020-2021 年的数据，建立了大范围时段的区域微震噪声概率模型。对约 1 赫兹频带的微地震研究发现，微地震噪声功率谱与全球最低水平相比存在季节性异常。除贝加尔湖北部外，贝加尔湖周围的地震台站从 5 月到 12 月都会出现这种异常现象。频率范围约为 1 Hz 的后方位角方向显示信号来自贝加尔湖，这表明这些信号可确定为由贝加尔湖产生的微地震。相干函数的高值证明了风速与湖泊微地震发生之间的线性关系。通过对地震环境噪声的频谱和极化参数进行详细分析，发现了两种类型的湖面微地震，频率分别为 0.4-0.7 和 0.7-1.5 Hz。第一个频率区间可能对应于单频湖面微地震，而第二个频率区间涵盖了双频微地震的频率范围。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

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.