Abstract
Purpose. The purpose of the paper is evaluation and analysis of the amplitude-frequency patterns of background microseisms (local ambient noises) and their possible seasonal variations in the territory of the Baikal seismic zone. Methods. The method of spectral relations of the vertical and horizontal components of the microseism (H/V-ratio) or Nakamura method is used. The continuous seismic recording data obtained by 23 short-period seismic stations of the Baikal Branch of the Federal Research Centre “Single Unified Geophysical Survey of the Russian Academy of Science” located in the Baikal seismic zone are used as an input material for the analysis. Only long segments of seismic records with the duration of at least 1 hour have been selected for the analysis in order to exclude possible random errors related to human-made noises, earthquakes, industrial explosions, etc. Results. The obtained curves of H/V-ratios and their seasonal variations characterize the amplitude-frequency patterns of local ambient noises in the frequency range from 0.5 to 10.0 or 20.0 Hz depending on the type of the recording equipment used. Conclusions. The obtained H/V-ratio curves can be conditionally divided into two groups: stable and featuring significant seasonal variations. The first group includes the stations with stable amplitude-frequency characteristics of the microseismic signal, which do not depend on the season. The second group includes the stations for which the H/V-ratio curves demonstrating significant seasonal variations have been obtained. Having compared the position of the seismic stations and the obtained H/V-ratio curves, the authors identified the dependence of the amplitude-frequency characteristics of the microseismic signal on their local conditions in the station setup area (at the outcrops of bedrock, in the zone of large active faults or in the rift depressions with a thick sedimentary cover).
Highlights
К настоящему времени разработан целый ряд методов для оценки амплитудно-частотных характеристик верхней части разреза [1, 3–6 и др.]
On the characteristics of local geology and their influence on ground motions generated by the Loma Prieta earthquake in the San Francisco Bay region, California // Bulletin of the Seismological Society of America. 1992
Bonilla L.F., Steidl J.H., Lindley G.T., Tumarkin A.G., Archuleta R.J. Site amplification in the San Ferdinando Valley, California: variability of site effect estimation using S-wave, coda, and H/V methods // Bulletin of the Seismological Society of America
Summary
К настоящему времени разработан целый ряд методов для оценки амплитудно-частотных характеристик верхней части разреза [1, 3–6 и др.]. Целью настоящей работы является оценка и анализ амплитудночастотного состава микросейсмических колебаний и их возможных сезонных вариаций на территории Байкальской сейсмической зоны методом спектральных отношений [8]. Методы и материалы Для оценки амплитудно-частотного состава микросейсмических колебаний и их возможных сезонных вариаций по данным сейсмических станций на территории Байкальской сейсмической зоны нами использовался метод спектральных отношений вертикальных и горизонтальных компонент микросейсм (H/Vотношения) или метод Накамуры [8].
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