盖州青石岭震群重复地震尾波Qc值变化特征

选取营口台和岫岩台记录的2012~2017年辽宁盖州青石岭M_L≥2.5地震波形资料，利用波形互相关方法拾取青石岭震群重复地震序列，并采用Sato单次散射模型计算单台记录的重复地震序列尾波Q_c值对频率的依赖关系及随时间的变化。结合盖州青石岭震群地区的地震活动特征可知，Q_c值变化所反映的区域应力变化与中强地震具有一定相关性；盖州地区在M_L≥4.0地震后Q_c值波动明显，存在局部调整并恢复的特点，局部应力积累不足以孕育更大的地震，而是以多次中等地震的形式释放局部积累的能量。

Study on Variation of Coda Qc Value of Gaizhou Qingshiling Repeating Earthquake Sequence

Using the waveform cross-correlation method, we identify M_L≥2.5 repeating earthquakes in Qingshiling, Gaizhou, Liaoning province, which are recorded by Yingkou and Xiuyan stations from 2012 to 2017. We apply the Sato single-scattering model to calculate the frequency dependence of coda Q_c value of repeating earthquake sequence and variation characteristics with time. Combined with the seismic activity characteristics of Qingshiling earthquake swarm area in Gaizhou, the results show that the stress reflected byQ_c change has a certain correlation with moderate-strong earthquakes. TheQ_c value fluctuated obviously afterM_L≥4.0 earthquakes in Gaizhou area, and has the characteristics of local adjustment and recovery. We infer that local stress accumulation is not enough to lead to larger earthquakes, and local accumulated energy is released by medium earthquakes for many times.