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| 太行山构造带及其以东地区上地幔地震层析成像 | |
| 引用本文： | 张学民,杨文采,赵大鹏,张从珍,李永红,刁桂苓.太行山构造带及其以东地区上地幔地震层析成像[J].地质学报,2012,86(3):371-382. |
| 作者姓名： | 张学民 杨文采 赵大鹏 张从珍 李永红 刁桂苓 |
| 作者单位： | 1. 中国地震局地震预测研究所,北京,100036;中国地震局地质研究所,北京,100029 2. 中国地质科学院地质研究所,北京,100037 3. Geodynamic Research Center, Ehime University, Matsuyama,790-8577, Japan 4. 河北省地震局,石家庄,050021 5. 山东省地震局,济南,250014 |
| 基金项目： | 国家重点基础科研973项目（2003CB716505）、中国博士后自然科学基金（20060390507）和地质过程与矿产国家重点实验室项目（GPMR0550）共同资助. |
| 摘 要： | 基于首都圈地区及河北邯郸台网共115个台站记录的地方震、近震和远震P波和S波走时,利用地震层析成像技术得到了太行山构造带及其以东地区下方300km深度范围内的P、S波速度结构。结果发现沿太行山构造带速度结构在上地幔中存在明显的横向不均匀性,其南、中、北段显示了各自不同的构造特征。太行山以东盆地区岩石圈厚度较薄,在约80km深度进入地幔软流层,但在160km深度下,P波和S波速度结构呈现较大差异,其中P波在华北东部地区逐渐以高速为主,而S波速度剖面上虽然低速体被切割,但仍然保持了大部分地区的相对低速。深部结构揭示,太行山中段受华北地区岩石圈减薄过程作用最为强烈,其速度结构与盆地区更为相似。而南段构造作用与浅部断裂关系明显,深部可能更多地保留了构造造山带岩石圈厚度大,高速介质多的特征。太行山北段处于多构造交界地区,速度结构比较复杂,部分S波低速区可能与深部地幔物质上涌作用有关。 |
| 关 键 词： | 地震层析成像 太行山构造带 上地幔 低速体 分段性特征 |
| 收稿时间： | 2009/3/31 0:00:00 |
| 修稿时间： | 2009/6/23 0:00:00 |
Upper mantle seismic tomography under Taihangshan tectonic belt and areas at its east |
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| zhangxuemin and YANG Wencai,ZHAO Dapeng,ZHANG Congzhen,LI Yonghong,DIAO GuiLing.Upper mantle seismic tomography under Taihangshan tectonic belt and areas at its east[J].Acta Geologica Sinica,2012,86(3):371-382. | |
| Authors: | zhangxuemin and YANG Wencai ZHAO Dapeng ZHANG Congzhen LI Yonghong DIAO GuiLing |
| Institution: | Institute of Earthquake Science, CEA |
| Abstract: | Based on P and S wave travel times of local, regional and far earthquakes recorded on 115 station distributed in capital area and Handan network in Hebei Province, P and S wave velocity structures beneath Taihangshan tectonic belt and areas at its east were obtained in the depth of 300km by seismic tomography technology. The results show that, there exists obviously transversal unhomogeneous in upper mantle velocity profiles along Taihangshan tectonic belt, where its southern, middle and northern segments exhibits their different structure features. Beneath the area at the east of Taihangshan, the lithosphere is thin, and the asthenosphere here is at the depth of about 80km. But under the depth of 180km, the P wave velocity structures show large differences in S wave velocity structures, in which at the east area of North China there presents mainly high P wave velocity, while S wave velocity maintains relatively low in most areas of North China basins although the low velocity media is cut by high velocity bodies. The deep structures demonstrate that, the middle segment of Taihangshan had been affected strongly by the lithospheric thinning in North China, and its velocity structure is much consistent with that beneath the basins. While the tectonic activity in southern segment was controlled apparently by shallow faults, but the upper mantle may maintain the character of old orogen with thick lithosphere and more high velocity media in upper mantle. The northern segment of Taihang belt, located at the boundary of multi-tectonic area, is complicated in velocity structure, and part low velocity region may be connected with mantle upwelling. |
| Keywords: | Seismic tomography Taihangshan tectonic belt Upper mantle Low velocity body Segmental characteristics |
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