| 青藏高原羌塘盆地中央隆起近地表速度结构的初至波层析成像试验 |
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| 引用本文： | 侯贺晟,高锐,卢占武,贺日政,李秋生,管烨,李朋武,熊小松.青藏高原羌塘盆地中央隆起近地表速度结构的初至波层析成像试验[J].地质通报,2009,28(6):738-745. |
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| 作者姓名： | 侯贺晟 高锐 卢占武 贺日政 李秋生 管烨 李朋武 熊小松 |
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| 作者单位： | 中国地质科学院地质研究所岩石圈中心,北京,100037 |
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| 基金项目： | 国家自然科学基金重点项目，科技部国际合作重点项目，国土资源部油气选区项目，国家专项深部探测技术实验与集成项目 |
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| 摘 要： | 利用2条衔接并横过青藏高原羌塘盆地中央隆起的反射地震剖面探测数据，进行了初至波层析成像试验，以揭示羌塘中央隆起的表层结构特征。研究结果表明，大量的反射地震单炮记录初至清晰，长排列接收丰富了浅表构造趋势特征的信息，层析走时射线密度随地下构造的复杂程度而变化。层析反演得到的速度结构显示了高速层起伏剧烈的变化特征，其厚度与地表出露地层的年代负相关。深反射地震初至波走时层析成像可以提供丰富的地壳近地表结构信息。
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| 关 键 词： | 青藏高原 羌塘盆地 中央隆起 深反射地震 初至波走时 近地表速度结构 层析成像 |
First arrival seismic tomographic imaging test of the near-surface velocity structure of central uplift in the Qiangtang basin, Qinghai-Tibet Plateau |
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| HOU He-sheng,GAO Rui,LU Zhan-wu,HE Ri-zheng,LI Qiu-sheng,GUAN Ye,LI Peng-wu,XIONG Xiao-song.First arrival seismic tomographic imaging test of the near-surface velocity structure of central uplift in the Qiangtang basin, Qinghai-Tibet Plateau[J].Geologcal Bulletin OF China,2009,28(6):738-745. |
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| Authors: | HOU He-sheng GAO Rui LU Zhan-wu HE Ri-zheng LI Qiu-sheng GUAN Ye LI Peng-wu XIONG Xiao-song |
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| Institution: | Lithosphere Research Centre, Institute of Geology , Chinese Academy of Geological Sciences |
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| Abstract: | In 2007 and 2008 two reflection seismic profiles that linking up and crossing the central uplift of the Qiangtang basin were acquired in Tibetan Plateau. The aim of writing this paper is to take advantage of these probe data and test the first arrival tomographic method to imaging the near-surface velocity structure of the central uplift in the Qiangtang. The results indicate that the first arrivals are clear in the recordings of high dynamite shots, and the detailed shallow structure trend emerges at long array receivers. The tomographic travel-rays assemble where the structure is complex underground. The tomographic image reveals the undulate character of the high velocity structure both vertical and horizontal. And its thickness has negative correlation with the age of the outcrop. All the research testifies that the first arrival seismic tomographic imaging method can provide more detailed near-surface velocity structure information. |
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| Keywords: | Qinghai-Tibet Plateau Qiangtang basin central uplift deep seismic reflection first break travel-time near-surface velocity structure tomographic imaging |
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