论文部分内容阅读
本文通过对沧州地区12个台站记录,从2008年7月至2010年7月记录的258远震事件进行接收函数计算,应用共转换点叠加成像方法对沧州地区地壳结构进行了研究。利用切向接收函数成像获得了沧州地区的结晶基底埋深。结果显示沧东断裂两侧基底埋深存在剧烈变化,断裂西侧基底埋深较浅,大约为2 km,断裂东侧基底埋深最深约8 km。径向接收函数成像结果显示沧东断裂西侧的沧县隆起上地壳厚度约为20~23 km,地壳厚度约34 km,断裂东侧的黄骅坳陷上地壳厚度约为25~26 km,地壳厚度约32 km,断裂两侧地壳厚度相差2 km。本文获取的结果与前人通过人工地震剖面以及层析成像获取的沧州地区地壳结构具有很好的一致性,还具有更高的分辨率。
In this paper, the receiver function of 258 teleseismic events recorded from 12 stations in Cangzhou and recorded from July 2008 to July 2010 is calculated. The crustal structure of Cangzhou area is studied by using co-conversion point superimposed imaging method. The buried depth of crystalline basement in Cangzhou was obtained by using the tangential receiver function imaging. The results show that there are drastic changes in the buried depth of the two sides of Cangdong fault. The buried depth of the west of the fault is shallow, about 2 km, and the depth of the deepest base of the east fault is about 8 km. Radial receiver function imaging results show that the upper crust of Cangxian uplifted to the west of Cangdong fault has a thickness of about 20 ~ 23 km and a crust thickness of about 34 km. The upper crust of the Huanghua depression east of the fault has a thickness of about 25-26 km. The thickness is about 32 km, and the crustal thickness on both sides of the fault varies by 2 km. The results obtained in this paper are in good agreement with the crustal structures of Cangzhou area obtained by previous seismic profiles and tomographic imaging and have higher resolution.