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首页> 外文期刊>Journal of Asian earth sciences >Extension of Godavari Gondwana sediments underneath Trap covered region of Satpura basin as evidenced from seismic studies in Deccan Syneclise, India
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Extension of Godavari Gondwana sediments underneath Trap covered region of Satpura basin as evidenced from seismic studies in Deccan Syneclise, India

机译：印度Deccan Syneclise地震研究表明，Satpura盆地圈闭覆盖区域下的Godavari Gondwana沉积物扩展

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摘要

We present a shallow P-wave velocity structure of the eastern part of Deccan Syneclise, central India,from the refraction and wide-angle reflection data recorded along two ~ 100 km long seismic refraction profiles in east-west (E-W) and north-south (N-S) directions using travel time inversion method. In addition to the P-wave velocity model, we have derived S-wave velocity model and estimated Vp/Vs and Poisson's ratios along the east-west profile. Travel time analysis and inversion of the data revealed three layers above the basement. The first layer with a P-wave velocity of 1.4-1.5 km s ' represents alluvium and the thickness of this layer is varying between 100-400 m in the E-W and 30-100 m in the N-S profile. The Deccan Trap thickness is observed to be varying between 850 and 1250 m constitutes the second layer. P-wave velocity of the Deccan Traps is 4.8-5.2 km s '. Amplitude decay and travel time skips in the first arrival refraction data in some of the record sections indicate the presence of a velocity inversion i.e. low velocity zone (LVZ) beneath the Traps. Wide-angle reflection phases from top and bottom of the LVZ (top of basement) together with basement refraction phase are identified and modeled to derive LVZ thickness. The LVZ has been interpreted to be the Gondwana sediments sandwiched between Deccan Traps and basement. These sediments are about 200-450 m thick with a P-wave velocity of 3.6 km s~(-1). The basement lies at about 1.60 km depth near Khandala in the west and Rajola in the north shows an upward trend towards south-east. The P-wave velocity of the basement is about 6.0-6.2 km s~(-1). The inferred subtrappean sediments could be the possible extension of Gondwana sediments of the Godavari graben towards the Satpura basin.
机译：根据沿东西向（EW）和南北向两个〜100 km长的地震折射剖面记录的折射和广角反射数据，我们给出了印度中部Deccan Syneclise东部的浅波速度结构（NS）方向使用行进时间反演方法。除了P波速度模型外，我们还推导了S波速度模型并估计了东西剖面上的Vp / Vs和泊松比。行程时间分析和数据反演显示了地下室以上三层。 P波速度为1.4-1.5 km s'的第一层代表冲积层，该层的厚度在E-W中为100-400 m，而在N-S中为30-100 m。观察到Deccan Trap厚度在第二层的850至1250 m之间变化。 Deccan陷阱的P波速度为4.8-5.2 km s'。在某些记录部分中的首次到达折射数据中，幅度衰减和传播时间的跳跃表明存在速度反转，即圈闭之下的低速带（LVZ）。识别并建模来自LVZ顶部和底部（地下室顶部）的广角反射相以及地下室折射相，以得出LVZ厚度。 LVZ被解释为夹在Deccan陷阱和地下室之间的冈瓦纳沉积物。这些沉积物厚约200-450 m，P波速度为3.6 km s〜（-1）。地下室位于西部Khandala附近约1.60 km的深度，而北部的Rajola向东南方向呈上升趋势。地下室的P波速度约为6.0-6.2 km s〜（-1）。推断的圈下亚太平洋沉积可能是戈达瓦里被掠夺的冈瓦纳沉积物向萨特普拉盆地的延伸。

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  • 来源
    《Journal of Asian earth sciences》 |2011年第6期|p.1232-1242|共11页
  • 作者

    A.S.N. Murty; M.M. Dixit; B. Mandal; S. Raju; Sanjay Kumar; P. Karupannan; K. Anitha; D. Sarkar;

  • 作者单位

    National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road. Hyderabad 500 606, India;

    National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road. Hyderabad 500 606, India;

    National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road. Hyderabad 500 606, India;

    National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road. Hyderabad 500 606, India;

    National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road. Hyderabad 500 606, India;

    National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road. Hyderabad 500 606, India;

    National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road. Hyderabad 500 606, India;

    National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road. Hyderabad 500 606, India;

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  • 正文语种 eng
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  • 关键词

    Seismic retraction; Low velocity Gondwana sediments; P- and S-waves; Velocity structure; Travel time inversion; Deccan Traps;

    机译：地震回缩;低速冈瓦纳沉积;P波和S波;速度结构;传播时间反演;Deccan圈闭;

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