【摘要】 分析了新疆几个形变台潮汐因子的时间分布及震兆异常特征,认为震兆异常的统计关系为:异常范围随着震级的增大而增大,5级地震前可能在100km范围出现异常,5 5级左右的地震可能达250km,而8级地震的异常范围则达到1000km以上;异常持续时间与震级呈正比关系,5级地震异常持续1～5个月,6级地震3～7个月;异常幅度与值受格值影响较大,在异常判定前观测仪器的精度及环境干扰关系密切;部分台的γm2必须做相关分析。更多还原

【Abstract】 By analyzing the time distribution of tidal factor and the anomalous characteristics of seismic precursors at several deformation stations in Xinjiang, we think the statistics relation of the precursor anomalies as followed. The range of anomalies is much bigger when the magnitude is increasing. It may be within 100 km before the earthquake with M_S5.0. It may be 250 km before one with M_S5.5.However it may be more than 1000 km before one with M_S8.0. And the duration of anomalies is direct ratio with the magnitudes. The anomalies of the earthquake with M_S5.0 last 1～5 months. However one of the earthquake with M_S6.0 lasts 3～7 months. The amplitude of anomalies is closely relative to the precision of observing instrument and the disturbance of environment. Theγ_m2 values of part of stations are effected very much by grid values. We have to do some correlation analyses before the anomalies are determined.更多还原