大兴安岭隆起北段最小一维速度模型反演和地震重新定位

使用2009-01-01～2017-03-30内蒙古地震台网和邻省台网记录的大兴安岭北段地区593个天然地震的3 848条P波到时数据，应用VELEST方法反演大兴安岭北段地壳一维P波速度模型、台站走时校正值和重新定位结果。联合反演获得的台站走时校正值反映了地壳速度的横向不均匀性及台站下方波速异常，大兴安岭北段东南侧速度高于西北侧；重新定位结果中，震中位置在空间上更加收敛；震源深度剖面图显示，大兴安岭北段西北侧震源深度较浅，东南侧较深，大兴安岭山脊区域震源深度分布下限较深。

Minimum 1-D Velocity Model Inversion and Seismic Relocation of Northern Segment of Greater Khingan Range Uplift

Using 3848 P-wave arrival times of 593 earthquakes in the northern Greater Khingan range area from observation data of Inner Mongolia seismic network from January 1, 2009 to March 30, 2017, 1-D crustal P-wave velocity model, relocation and station correction value are inversed. The results of different initial models converge reasonably well, and through the speed disturbance test, the inversion result is relatively stable. The results obtained by joint inversion show the lateral heterogeneity of the crustal velocity and the wave velocity abnormality below the stations. The velocity of the southeast side of the northern segment of Greater Khingan range is higher than that of the northwest side. In the relocation results obtained by joint inversion, the location of the epicenter is more convergent in space. The focal depth profile shows that focal depth of the northwest side is shallow, yet deep in the southeast. In the Greater Khingan range ridge area, the focal depth distribution has a deeper lower limit.