Assessment of the 2S1 mode triplet based on IGETS data after 2010 Chile earthquake

Авторы: Milyukov V.K., Vinogradov M.P.
Журнал: Pure and Applied Geophysics
Том: 180
Год издания: 2023
Издательство: Springer Nature
Местоположение издательства: Switzerland
Первая страница: 735
Последняя страница: 746
DOI: 10.1007/s00024-022-03158-x
Аннотация: Based on the maximum likelihood method, an optimal algorithm has been developed for detecting the 2S1 mode triplet in seismic noise. The algorithm allows to estimate the degenerate frequency and the splitting parameter "b", which determines the range of the mode singlets from each other, and also to estimete the detection reliability (the false alarm probability). The algorithm was tested on synthetic data. A synthetic signal with amplitude of about 2 nGal and a signal-to-noise ratio of5·10^(-3) was detected over noise background and the calculated estimates was fully agree with the specified signal model. The test was shown that the algorithm is very effiective.The algorithm was applied to study the 2S1 mode after the significant earthquake in Chile on February 27, 2010. The records of the 22 superconducting gravimeter from IGETS network was used. The degenerate frequency of the 2S1 mode and the Coriolis splitting parameter were estimated, and triplet frequencies were calculated.
Добавил в систему: Виноградов Михаил Петрович

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