摘要
综合考虑了地震活动时空强3 个方面的震兆特征,定义了地震活动因子 A值.使用1972 ~1996 年华北地区地震资料进行空间扫描,研究中强以上地震前 A 值的中短期异常变化特征.结果表明,在中短期阶段大多数地震前出现的 A 值中期异常区面积明显缩小或消失,也有一些地震前1 ~3 个月 A 值异常区面积再次增大.还就用 A
The seismicity factor A value is defined by synthesizing the seismicity precursors in time, space and magnitude.The seismicity data of moderate or small earthquakes during 1972~1996 in northern China are used in spacial scanning of seismicity factor A value,studying mid short term change of the A value before the earthquakes.The result shows that in mid short term, the mid term anomaly zones of A value that appeared about 2~3 years before a lot of strong earthquakes may contract or disappear obviously, and the zones may obviously extend again about 1~3 months before some earthquakes. Some problems about mid short term earthquake prediction by using the A value are also disscused.
出处
《西北地震学报》
CSCD
1999年第3期234-241,共8页
Northwestern Seismological Journal
基金
中国地震局9504 项目
关键词
地震活动因子
A值
地震预报
中短期预报
North China
Regional seismicity
Seismicity factor A value
Mid short term anomaly