| 利用共转换点叠加方法研究华北地区地壳结构 |
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| 引用本文： | 武岩,丁志峰,朱露培.利用共转换点叠加方法研究华北地区地壳结构[J].地球物理学报,2011,54(10):2528-2537. |
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| 作者姓名： | 武岩 丁志峰 朱露培 |
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| 作者单位： | 1. 中国地震局地球物理研究所,北京 100081;
2. Department of Earth and Atmospheric Sciences, Saint Louis Univ., Missouri 63103, USA |
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| 基金项目： | 科技部基础性工作专项项目 |
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| 摘 要： | 利用华北地震台阵L测线的35个台站记录的895个远震数据进行了接收函数的计算,并利用H-κ叠加方法得到华北克拉通西部陆块东侧和中部陆块内基岩台站下方的地壳结构.利用得到的基岩台站下方的地壳结构和通过波形模拟方法得到的渤海湾盆地的沉积层结构作为背景模型对测线进行共转换点(CCP)叠加成像.在渤海湾盆地,通过增大CCP叠加...
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| 关 键 词： | 接收函数 山西断陷带 渤海湾盆地 重力梯度带 莫霍面 |
| 收稿时间： | 2011-04-11 |
Crustal structure of the North China Craton from teleseismic receiver function by the Common Conversion Point stacking method |
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| WU Yan,DING Zhi-Feng,ZHU Lu-Pei.Crustal structure of the North China Craton from teleseismic receiver function by the Common Conversion Point stacking method[J].Chinese Journal of Geophysics,2011,54(10):2528-2537. |
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| Authors: | WU Yan DING Zhi-Feng ZHU Lu-Pei |
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| Institution: | 1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;
2. Department of Earth and Atmospheric Sciences, Saint Louis Univ., Missouri 63103, USA |
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| Abstract: | 895 teleseismic data recorded by the 35 stations located on North China Craton (NCC) as a line are used to calculate the receiver functions which are used to obtain the crustal structure under the stations installed on bedrock by H-κ stacking method. The image of the crust along the 550 km-long profile is obtained by the common conversion point (CCP) stacking method using the crustal model calculated from the H-κ stacking and the sedimentary structure calculated before. Because some stations are located on sediments, the size of the bin used in the CCP stacking is enlarged to strengthen the amplitude of the P to S conversion phases. Then the crustal structure of the Bohai Bay Basin (BBB) can be imaged by CCP stacking. The result shows that the crust thickness of the west NCC is much thicker than that of the east NCC. The thickness of the Western Block is about 45 km. The crustal thickness reduces to 43 km under the Lüliangshan which may be the boundary between the Western Block and the Trans-North China Orogen (TNCO) in the depth of Moho. In the west of the North-South Gravity Lineament, the average crustal thickness is about 42 km while the Moho rises slightly under the Shanxi fault depression zone. There is a discontinuity under east of Datong Basin, which may be the channel of the mantle-derived material. In the North-South Gravity Lineament belt, the crustal thickness reduced obviously to 33 km. The average crustal thickness of the Bohai Bay Basin (BBB) is about 32 km, which is much thinner than the one of the Central Block. The Moho depth under the Jizhong depression is the shallowest, which can reach to 29 km in the thinnest area along the profile. The thick sedimentary layer corresponds to the thin crust, which can be explained by the extension of the basin. |
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| Keywords: | Receiver functions Shanxi fault depression zone Bohai Bay Basin North-South Gravity Lineaments Moho discontinuity |
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