| 青藏高原及其邻区地壳上地幔S波速度结构 |
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| 引用本文：苏伟,彭艳菊,郑月军,黄忠贤.2002.青藏高原及其邻区地壳上地幔S波速度结构[J].地球学报,23(3):193-200. |
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| 基金项目:国家自然科学基金(49834020)(40034010) |
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| 中文摘要:利用CDSN、IRIS、GEOSCOPE等台网 33个数字台站及部分数字流动台的长周期面波资料 ,采用改进的Occam网格反演方法 ,在获得中国大陆及其邻近区域 (5°～ 5 5°N ,6 8°～ 15 0°E) 1°× 1°的 7～ 184s周期Rayleigh波群速度频散的基础上 ,进一步反演青藏高原及邻区 (2 0°～ 40°N ,75°～ 10 5°E)内每个经纬度节点介质的S波速度结构 ,获得了 0～ 42 0km深度地壳上地幔的三维速度分布。研究结果显示 :青藏高原不但具有厚壳 (6 0～ 70km)和厚岩石圈 (超过 2 0 0km) ,而且高原深部结构和速度分布存在明显的横向变化和分区特征。 |
| 中文关键词:S波速度 地壳上地幔 青藏高原 |
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| Crust and Upper Mantle Shear Velocity Structure beneath the Tibetan Plateau and Adjacent Areas |
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| Abstract:The long period surface data recorded by 33 digital seismic stations of CDSN, IRIS, GEOSCOPE and other temporary seismic stations were used to study the crust and upper mantle shear velocity structure beneath the Tibetan plateau and adjacent areas (20°～40°N,75°～105°E). In China and adjacent areas(5°～55°N,68°～150°E), Rayleigh group velocity dispersions between 7s and 184 s period of 1°×1° grid were calculated by means of occam's inversion. From these dispersion curves, the three dimensional shear velocity structures in 0～420 km depths were inverted at each node in the study area (20°～40°N, 75°～105°E). The results indicate that the Tibetan plateau not only has a thick crust (60～70 km) and very thick lithosphere (exceeding 200 km), but also shows ob vious lat eral variation of crust and upper mantle velocity structure in different terranes. |
| keywords:shear wave velocity crust and upper mantle Tibetan plateau |
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