盖州青石岭震群重复地震尾波Q_(c)值变化特征  

Study on Variation of Coda Q_(c) Value of Gaizhou Qingshiling Repeating Earthquake Sequence

作　　者：邵媛媛[1] 王亮[1] 贾丽华[1] 杨士超 王岩[1] SHAO Yuanyuan;WANG Liang;JIA Lihua;YANG Shichao;WANG Yan(Liaoning Earthquake Agency,44 North-Huanghe Street,Shenyang 110031,China)

机构地区：[1]辽宁省地震局,沈阳市110031

出　　处：《大地测量与地球动力学》2022年第4期421-425,430,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震预测研究所基本科研业务费专项(2018IEF0102);中央级公益性科研院所基本科研业务费专项(DQJB21B34);中国地震局地震科技星火计划(XH18014Y)。

摘　　要：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。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 by Q_(c)change has a certain correlation with moderate-strong earthquakes.The Q_(c)value fluctuated obviously after M_(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.

关 键 词：盖州地区 重复地震 尾波 特征 

分 类 号：P313[天文地球—固体地球物理学] P315[天文地球—地球物理学]