1999年岫岩地震序列尾波Q_c的变化过程  

Temporal process of S-Coda Q_c of Xiuyan earthquake sequence in 1999

作　　者：王伟君[1] 刘杰[1] 

机构地区：[1]中国地震局分析预报中心,北京100036

出　　处：《地震》2004年第4期37-44,共8页Earthquake

基　　金："十五"国家科技攻关项目(2004BA601B01 04 03);地震科学联合基金项目(101126)

摘　　要：采用Sato单次散射模型,利用近场台站岫岩台和营口台波形资料,计算了1999年岫岩地震序列S尾波品质因子Qc,得到了3个分量10个频率点上Qc随时间进程的变化。将序列分为3个时段:前震时段、强余震活动时段、序列结束时段,分别计算出每个时段内Qc与频率的关系Qc(f),最后计算了整个序列的Qc(f)。结果表明,Qc在大震前后有较明显的变化,基本趋势是震前Qc增高,震后降低。另外,在不同的台站和不同的分量上Qc变化有不同的反映灵敏度。比较该方法与Aki单次散射模型方法在计算结果上的差别,认为Sato方法在本文的数据处理上更为合理。Using the Sato′s single isotropic scattering model, the authors calculated the S-coda attenuation factor Q_c values of 1999 Xiuyan M_L5.9 earthquake sequence at Xiuyan station and Yingkou station. And the temporal changes of Q_c in three components and 10 center frequencies are obtained for the two stations. Dividing the sequence into three time periods by the occurrence of two main quakes, the Q_c and frequency relation for the three time periods and total time sequence were calculated. The results show that Q_c increases in trend before the strong earthquake and decreases after the strong earthquake. The changes of Q_c vary at different stations and in different components. Compared it with Aki′s single backscattering model, the authors believe that Sato′s model is more reasonable for our data processing.

关 键 词：地震序列 尾波品质因子Qc Sato单次散射模型 Aki单次散射模型 

分 类 号：P315.3[天文地球—地震学]