当涂地震站地方震Sc震相分析及康拉德面特征

2016年2月13日4时17分，芜湖市弋江区发生M_L 2.1地震，震中距43.75 km，震源深度8 km。当涂地震站记录的两水平向波形均出现3个明显震相，前面2个震相分别为Pg、Sg，在横波Sg震相之后又出现一个振幅较大的不明震相。通过分析，发现该不明震相为康拉德面上的反射波Sc。分析马鞍山测震台网记录的初动较清晰的6个Sc震例，对Sc走时和震中距进行拟合，得到康拉德面上方横波速度为3.59 km/s，康拉德面深度在20.35—23.85 km之间，与已知相关数值接近。

Analysis of local earthquake Sc seismic phase of Dangtu Seismic Station and Conrad interface features

At 4:17 on February 13, 2016, an M_L 2.1 earthquake occurred in Yijiang District, Wuhu City, with a focal depth of 8 km. The epicentral distance of the Dangtu seismic station is 43.75 km. There are three obvious seismic phases in two horizontal component records of the Dangtu Seismic Station. The first two seismic phases are Pg and Sg, respectively. After the Sg phase, there is an unknown phase with a large amplitude.
Through the analysis, it is found that the unknown seismic phase is the reflection phase Sc from the Conrad interface. Analysis of the Sc phase of 6 earthquakes with clear initial motion recorded by the Ma’anshan seismic network shows that the shear wave velocity above the Conrad interface is 3.59 km/s. The depth of the Conrad interface is between 20.35—23.85 km, which is close to the known relevant values.