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chu xiong tai qing xie chao yin zi de bian hua ji qi di zhen yi chang te zheng
Author(s): 
Pages: 248-253
Year: Issue:  3
Journal: Journal of Seismological Research

Keyword:  Harmonic analysisGround tilt tideγ value method.;
Abstract: Using the Venedicov harmonic analysis method, the harmonic anlysis of the earth-tide observation data from seismological observatory of Chuxiong (1985-1990)is made and the relation between variation of γ value of M2 wave with time and earthquake is studied, and some characteristics are found as follows:1. No variation of γ value with time was found under normal conditions.but preparaction and occurrence of earthquake caused short-term earthquake precursor variation in γ value ranging from 1.0 percent to 9.3 percent;2. There was trend variation in γ value during the preparation of large magnitude 7 earthquake; 3. Uneven rariation in γ value relating to tectonic activity;4. Variation in γ value was affected striking by small earthquake-swarm activity.
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