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://doi.org/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}
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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.
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.
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