Fine Structures of the Crust in Cangzhou Region in North China
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摘要: 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。Abstract: We calculated the receiver functions of 258 teleseismic events recorded by 12 portable seismic stations during July 2008 to July 2010 in Cangzhou region and imaged the crustal structure by using the common conversion point stacking method. The transverse RF image revealed that the basement depth. There is an abrupt change of the basement depth across the Cangdong Fault, the basement depth is ~2 km in the west of the Fault and changed to 8 km in the east of the fault. The radial RF image revealed that the thickness of the upper crust and Moho depth. The upper crustal thickness and Moho depth are 20~23 km and 34 km in the west of the Cangdong fault. The upper crustal thickness and Moho depth are 25~25 km and 32 km in the east of the Cangdong fault. The crustal structure with the better resolution in this study is quite consistent with the results obtained by the deep seismic sounding profiles and tomography.
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Keywords:
- receiver function /
- Cangdong fault /
- crustal structure
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