| 华北地区地壳厚度与泊松比研究 |
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| 引用本文： | 葛粲,郑勇,熊熊.华北地区地壳厚度与泊松比研究[J].地球物理学报,2011,54(10):2538-2548. |
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| 作者姓名： | 葛粲 郑勇 熊熊 |
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| 作者单位： | 1. 大地测量与地球动力学国家重点实验室,中国科学院测量与地球物理研究所,武汉 430077;
2. 中国科学院研究生院,北京 100049 |
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| 基金项目： | 中国科学院创新方向性项目，自然科学基金 |
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| 摘 要： | 华北地区地壳结构和物理性质是研究华北克拉通破坏机制的重要依据.本文通过收集分布在华北克拉通区域的323个宽频带地震台记录到的2007年8月到2009年3月间发生在全球范围内6.5级到8.5级的共93个远震事件的波形资料,较完整地得到了华北及其周边区域台站下方的接收函数、地壳厚度和泊松比分布情况.研究发现:(1)华北克拉...
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| 关 键 词： | 华北克拉通 接收函数 地壳厚度 泊松比 |
| 收稿时间： | 2011-02-15 |
Study of crustal thickness and Poisson ratio of the North China Craton |
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| GE Can,ZHENG Yong,XIONG Xiong.Study of crustal thickness and Poisson ratio of the North China Craton[J].Chinese Journal of Geophysics,2011,54(10):2538-2548. |
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| Authors: | GE Can ZHENG Yong XIONG Xiong |
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| Institution: | 1. State Key Laboratory of Geodesy and Geodynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;
2. Graduate University, Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The crustal thickness and physical properties of the North China Craton (NCC) are important for understanding the destruction of NCC. We collected waveforms of teleseismic events which occurred from August 2007 to March 2009 from 323 broadband seismic stations deployed in the NCC region. In order to obtain reliable receiver functions, the broadband seismograms of 93 teleseismic earthquakes occurred in the epicentral distance range from 30 degree to 95 degree with magnitudes M6.5 to M8.5 were collected. Based on these data, we calculated the receiver functions for each of the seismic stations, and inverted for the distributions of crustal thickness and Poisson ratio for the NCC with fine spatial coverage. There are three characteristics of the crustal thickness and the Poisson ratio: (1) Crustal thinning process not only occurs in the east part of NCC, but also extends to the North South Gravity Lineament. (2) Crustal thinning also occurs in the rifts and basins surrounding the Ordos block, and the Poisson ratio in the surrounding rifts is higher than that inside of the Ordos block. In some rifts the Poisson ratio is as high as 0.3. (3) The crustal thickness of NCC is negatively correlated to the topography, which is in consistence with Airy isostasy, which may imply that the NCC crust is experiencing a slow process of destruction and isostasy. While the isostasy degree is much lower in the central west and north east part of NCC. |
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| Keywords: | North China Craton Receiver functions Crustal thickness Poisson ratio |
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