Detection of spheriodal free oscillation excited by Peru 8.2 Ms earthquake with five international superconducting gravi

In this paper, authors obtain the spectral peaks of the earth free oscillation and check all normal modes from 0S0 to 0S48 accurately, with the Fourier analysis and the maximum entropy spectrum method dealing jointly with six groups of the observational residual data from five international superconducting gravimeter stations. By comparing the observational results in this paper with three former groups of observations or models, authors notice an extra discrepancy between two observational 0S2 modes excited separately by Peru earthquake and Alaska earthquake, which probably mirrors the anisotropy of the Earth's inner core. The analysis on the splitting 1S2 mode shows that the asymmetric factor of rotationwise spectral splitting is possible to be different from that of anti-rotationwise spectral splitting.

作 者： LEI Xiang'e Xu Houze Sun Heping   作者單位： Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics. Chinese Academy of Sciences, Wuhan 430077, China  刊 名： 中國科學(xué)D輯（英文版）  SCI 英文刊名： SCIENCE IN CHINA (EARTH SCIENCES)  年，卷(期)： 2005 48(1)  分類號： P3  關(guān)鍵詞： 8.2 Ms Peru earthquake   detection of Earth free oscillation   observation of superconducting gravimeter   anisotropy of earth's inner core  

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