辽宁地区最小一维速度模型研究  

Research on the Minimum 1-D Velocity Model in Liaoning Area

作　　者：戴盈磊[1] 刘晓丹[2] 张文静 王承伟[1] 李子昊 DAI Yingei;LIU Xiaodan;ZHANG Wenjing;WANG Chengwei;LI Zihao(Liaoning Earthquake Agency,Shenyang 110034,China;Hebei Earthquake Agency,Shijiazhuang 050021,China)

机构地区：[1]辽宁省地震局,沈阳110034 [2]河北省地震局,石家庄050021

出　　处：《华南地震》2023年第2期35-45,共11页South China Journal of Seismology

基　　金：辽宁省地震局预研孵化基金项目(LZ2022001);中国地震局地震应急与信息青年重点任务(CEAEDEM202305);辽宁省地震局青年科研基金项目(LN2022012)联合资助。

摘　　要：根据辽宁测震台网最近10年的观测资料,从中筛选出2851个地震事件的Pg、Sg走时数据,使用Velest程序,反演了辽宁地区P波和S波最小一维速度模型及台站校正值,并对震源位置进行了重新定位。结果显示走时数据方差和走时残差均方根分别下降70%和45%以上。台站校正的分布情况体现出辽宁地区地下介质的横向不均匀性。重定位后的震源位置更加集中,与震群和发震构造的对应关系更明显,平均震源深度为10.16 km。经过正负扰动测试和震源位置恢复性测试检验,证明此研究所得最小一维速度模型较为稳定并具备一定的可靠性。According to the observation data of Liaoning seismic network in recent 10 years,the Pg and Sg travel time data of 2851 seismic events were selected.The minimum 1-D velocity model of P wave and S wave in Liaoning,and the station correction value were inverted by using Velest program,and the source location was repositioned.The results show that the travel time data variance and the travel time residual RMS decrease by more than 70%and 45%respectively.The distribution of station corrections reflects the lateral inhomogeneity of the underground medium in Liaoning.The focal location after relocation with the average focal depth of 10.16 km is more concentrated,the corresponding relationship with the earthquake swarm and the seismogenic structure is more obvious.The positive and negative perturbation test and source location recovery test prove that the minimum 1-D velocity model is relatively stable and has certain reliability.

关 键 词：最小一维速度模型 走时残差均方根 台站校正 地震定位 辽宁地区 

分 类 号：P315.3[天文地球—地震学]