| 利用体波层析成像技术研究欧亚及邻区地幔三维速度结构 |
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| 引用本文： | 程先琼, 朱介寿, 蔡学林. 利用体波层析成像技术研究欧亚及邻区地幔三维速度结构[J]. 沉积与特提斯地质, 2003, 23(2): 90-94. |
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| 作者姓名： | 程先琼 朱介寿 蔡学林 |
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| 作者单位： | 成都理工大学,四川 成都 610059 |
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| 摘 要： | 根据体波层析成像技术,利用大量走时数据,做出0°~180°E,30°S~90°S范围内0~2889km深的三维速度分布图像,得到欧亚地区局部区域岩石圈及地幔的高分辨率速度结构,并从地球动力学角度出发对这些成像结果做进一步解释。
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| 关 键 词： | 体波层析成像 三维速度结构 地球动力学 |
| 文章编号： | 1009-3850(2003)02-0090-05 |
| 收稿时间： | 2003-01-17 |
| 修稿时间： | 2003-01-17 |
The 3-D velocity structures of the Eurasian mantle based on the body wave tomography |
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| CHENG Xian-qiong, ZHU Jie-shou, CAI Xue-lin. The 3-D velocity structures of the Eurasian mantle based on the body wave tomography[J]. Sedimentary Geology and Tethyan Geology, 2003, 23(2): 90-94. |
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| Authors: | CHENG Xian-qiong ZHU Jie-shou CAI Xue-lin |
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| Affiliation: | Faculty of In formation Engineering,Chengdu University of Technology,Chengdu 610059,Sichuan,China |
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| Abstract: | About 7 000 000 travel time data for 1964-1997 from ISC were used to construct the images of the 3-D velocity distribution within the context of 0°-180°E and 30°S-90°S at the depths from 0 km to 2 889 km, and the images of the high-resolution velocity structures of the lithosphere and mantle in the Eurasian area. The results of research show that:(1) the high-velocity anomalies appear in the upper part of the Upper Mantle (depth<530 m) throughout the Eurasian plate, suggesting an Eurasian continental root and a higher velocity of the continental lithosphere than that of the oceanic lithosphere in this part of the mantle; (2) the NW-SE-trending Tethyan tectonic zone is observed in the Middle Mantle (at the depths of 900 -1 800 km); (3) the high-velocity anomalies occur in eastern China and its neighbouring sea areas, while the low-velocity anomalies appear in the East Afria rift and western Indian Ocean, and (4) the decreasing seismic wave velocities at the core-mantle boundary indicate a stronger effect of high temperatures of the core. |
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| Keywords: | body wave tomography 3-D velocity structure geodynamics |
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