华北地区断层形变与地震的关系

RELATIONSHIP BETWEEN FAULT DEFORMATION AND EARTHQUAKES IN NORTH CHINA

用线性拟合方法计算了华北地区1985—2006年断层背景活动速率,并对跨断层形变测量资料逐项扫描识别异常,分区带统计计算异常数量和异常频率。结果显示,在6级及以上地震发生前一年左右,异常频率开始增大,地震发生在异常高频延续过程中或者结束后。异常频率对5级地震也有一定的反映。

The background deformation crustal velocity of North China in the period from 1985 to 2006 was calculated with the linear fitting method. Anomaly-distinguishing scanning was made one iterm after another and the data including cross-fault deformation observation anomaly amount and anomaly frequency were calculated according to the zones or areas. The results indicate that about one year before earthquakes of M≥6.0, anomaly frequency became larger and earthquake often occurred during or after the progress of high-frequency anomaly. There is also certain reflections of the anomaly frequency on earthquakes of M≥5. 0.