论文部分内容阅读
依据沿近于EW向的燕山断陷带附近的定点形变观测结果，讨论了异常区域分布的动力学特征。结果表明：①在燕山北部块体上的EW向倾斜在震前1年时间尺度内保持相对静止，而NS向则向南加速倾斜，震前0．5年在附近台站出现回跳；②同一测点处二个方向倾斜的发散度在震前2年内出现相似的运动特征，呈减弱趋势；③同一块体不同测点处的异常强度AF值在震前3年间至少出现2次较显著的异常标志。
According to the observed deformation near the Yanshan fault zone near the EW, the dynamic characteristics of the anomaly distribution are discussed. The results show that: (1) the EW trending in the block of northern Yanshan remained relatively still within 1 year before the earthquake, while the NS direction was accelerated to the south, and rebound occurred in nearby stations 0.5 year before the earthquake; The divergence of tilt in the two directions at the same measuring point showed a similar trend of motion within 2 years before the earthquake, showing a decreasing tendency. ③ The AF value of the anomalous intensity at different measuring points of the same block appeared at least twice in the three years before the earthquake Abnormal sign.