【摘要】 从分析地震活动性参数变化特征的角度出发，结合实际的地震活动观测资料，对张北６．２ 级地震前河北省及邻区地震活动性参数的变化，地震序列的衰减特征进行了分析，结果表明张北６．２ 级地震前在震源区附近１００ｋｍ 和大范围地震活动性参数有长、中、短期的异常变化。张北６．２ 级地震强余震前地震活动性参数有短、临变化。更多还原

【Abstract】 Acording to changes of seismic activity parameters and using actual observation data,the author has analyzed the changes of the seismic activity parameters in Hebei Province and its adjacent regions before the Zhangbei M S 6.2 earthquake and the attenuation characteristic of its sequence.The result shows that the seismic activity parameters in the area of 100 km around the focal zone and large range showed long-term,mid-term and short-term andomalous changes before the Zhangbei M S 6.2 earthquake.Before the strong after shocks of the Zhangbei M S 6.2 earthquake,the seismic activity parameters showed short-term and imminent changes.更多还原