| 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。 |
| 关键词: 体波层析成像 三维速度结构 地球动力学 |
| DOI： |
| 附件 |
| 投稿时间：2003-01-17 |
| 基金项目: |
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| The 3-D velocity structures of the Eurasian mantle based on the body wave tomography |
| CHENG Xian-qiong, ZHU Jie-shou, CAI Xue-lin |
| (Faculty of In formation Engineering, Chengdu University of Technology, Chengdu 610059, Sichuan, China) |
| 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. |
| Key words: body wave tomography 3-D velocity structure geodynamics |
