| 青藏高原地震波三维速度结构的研究 |
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| 引用本文： | 丁志峰,何正勤,吴建平,孙为国.青藏高原地震波三维速度结构的研究[J].中国地震,2001,17(2):202-209,T001. |
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| 作者姓名： | 丁志峰 何正勤 吴建平 孙为国 |
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| 作者单位： | 中国地震局地球物理研究所,中国北京,100081 |
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| 基金项目： | 本文得到国家科委攀登预选项目"东亚大陆动力学研究"和地震科学联合基金"中国大陆岩石圈结构"(No.9507413)的资助.中国地震局地球物理所论著号01AC1008. |
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| 摘 要： | 根据青藏高原及其邻区的模拟地震台站和宽频带数字地震记录资料,采用区域体波层析成你和瑞利面波层析成像,反演得到了青藏高原地区的三维地震波速度结构。两种层析成像方法得到的地壳上地幔P波和S波速度结构的结果非常相似,它们显示,青藏高原南部的拉萨块体的上地壳存在明显的低速区,青藏高原北部的羌塘地区的下地壳和上地幔顶部相对速度较低。这些结果与青藏高原南、北部处于碰撞过程中的不同阶段有关。
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| 关 键 词： | 青藏高原 地震层析成像 三维速度结构 瑞利面波 地壳 深部结构 |
Research on the 3-D Seismic Velocity Structures in Qinghai-Xizang Pla-teau |
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| Ding Zhifeng,He Zhengqin,Wu Jianping,Sun Weiguo.Research on the 3-D Seismic Velocity Structures in Qinghai-Xizang Pla-teau[J].Earthquake Research in China,2001,17(2):202-209,T001. |
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| Authors: | Ding Zhifeng He Zhengqin Wu Jianping Sun Weiguo |
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| Abstract: | Based on the recording data from the synthetic and broadband digital seismic stations in and around Qinghai-Xizang Plateau,the 3-D seismic velocity structures in Qinghai-Xizang Plateau were obtained by using the regional body wave tomography and surface wave tomography. The results from these two tomography methods have similar characteristics for P- and S- wave velocity structure in crust and uppermost mantle. They show that there are remarkable low velocity zones in the upper crust of Lhasa block in the southern Xizang and the lower crust and uppermost mantle of Qiangtang block in the northern Xizang. These phenomena may be related to the different steps of collision process for southern and northern Xizang. |
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| Keywords: | Qinghai-Xizang Plateau Seismic tomography 3-D velocity structures |
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