基于Wigner-Ville分布的地磁前兆异常提取方法及其在川滇地区的应用

Abstract

Abstract: To extract weak seismo-magnetic information from strong background field, we carry out time- frequency analysis of geomagnetic Z-component in Sichuan—Yunnan region using Smoothed and Pseudo Wigner- Ville Distribution( SPWVD). By studying different periodic components of the filtered Z-component , which main periods are 2~6 h,we find that the 2.4 h periodic component is easy to be affected by external field, and the 4.4 h periodic component shows obvious high value of anomalies before many significant earth- quakes in the region.

Key words: Geomagnetic Z-component, Wigner-Ville distribution, Precursory anomaly, Sichuan-Yunnan region, Lushan earthquake

CLC Number:

P315.7

HE Kang, YAN Rui, WANG Chun, ZHENG Hai-gang, LI Jun-hui, FANG Zhen. Extracting Geomagnetic Precursory Anomaly based on Wigner-Ville Distribution and Application in the Sichuan- Yunnan Region[J]. EARTHQUAKE, 2014, 34(4): 88-99.

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Extracting Geomagnetic Precursory Anomaly based on Wigner-Ville Distribution and Application in the Sichuan- Yunnan Region

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