年变量
However, the anomalies of moderately strong earthquake ′ s field precursors are short-term, negative ones with obvious amplitude, and show pulse bound, high value rising within short time, step-like change, and the regularity of yearly variation is broken.
而中强震场兆异常,一般表现为幅度明显的短期内的负异常、脉冲突跳、短期内的高值上升、阶变及年变化规律被打破等;
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