A new method for precursory information extraction, i. e. slope difference information method is proposed in the paper for the daily mean value precursory data sequence.
针对日均值前兆数据序列，提出一种新的前兆信息提取方法，即斜率差信息法。
The experiment results showed that the daily maximum and daily mean value of soil temperature were decreased, the daily minimum of soil temperature was increased in comparison with control.
实验结果表明，有机物覆盖使土壤的日最高温度和日平均温度降低，但却使土壤的日最低温度得以提高。
The figure of daily mean value in resent year showed: the medium term anomaly with impulse jumps appeared 11 months before the event, and the maximum of anomaly was 84 times of the normal rising rate;
年日均值图显示，中期异常出现在震前11个月左右，表现为脉冲式向上突跳及阶跃式上升， 最大异常量为日均正常上升速率的84倍；
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