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首页> 外文期刊>Journal of the Geological Society of India >Comparative Evaluation of Active Tectonics in Parts of the Frontal Region of NW Himalaya, India by Geomorphic Analysis and Geophysical Investigation
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Comparative Evaluation of Active Tectonics in Parts of the Frontal Region of NW Himalaya, India by Geomorphic Analysis and Geophysical Investigation

机译：地貌分析和地球物理调查，印度NW喜马拉雅大额外地区积极构造的比较评价

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摘要

The Himalayan Frontal Thrust (HFT) is the southern-most boundary of Himalayan mountain belt. It represents a zone of active deformation between the sub-Himalaya and Indo-Gangetic alluvial plain. Morphometric analysis of five sixth order drainage basins along the HFT has been carried out for evaluating relative tectonic activity of the region. Based on the combination of various geomorphic indices such as drainage basin spatial asymmetry, drainage gradient, drainage cross profile and mountain front sinuosity indices, the relative tectonic activity in and around the test site drainage basins was evaluated. Where all the indices are not in agreement, the relative importance of the geomorphic indices was considered to evaluate relative tectonic activity which was then compared with the abundance of drainage anomalies and previously reported active tectonic features (including active faults and fractures). Finally, the results were corroborated with the spatial frequency distribution pattern of previous seismicity (>2.5 Mw). Geophysical investigation by multi-frequency, bi-static ground penetrating radar (GPR), conducted at selective locations in the piedmont-alluvial region of Solani and Markanda drainage basins, supports active deformation of sub-surface sediment layers. Well-defined offset and warping of near-surface sediment layers indicating the presence of active fault and deformation of sediment layers were observed in 40 MHz and 100 MHz radargrams near Biharigarh and Mujahidpur villages in Solani drainage basin (Uttarakhand and U.P.) and near Toka village in Markanda drainage basin (H.P.).
机译：喜马拉雅前推（HFT）是喜马拉雅山带的南部最界限。它代表了亚马拉雅群和印度难以发生平原之间的积极变形区域。已经进行了沿HFT的五个第六阶排水盆的形态学分析，用于评估该区域的相对构造活性。基于各种地貌指数的组合，如排水盆地空间不对称，排水梯度，排水十字轮廓和山前索度指数，评估试验场排水盆地中的相对构造活动。在所有索引不一致的情况下，考虑了地貌指数的相对重要性来评估相对构造活动，然后与排水异常的丰度和先前报告的有源构造特征（包括有源故障和骨折）进行比较。最后，结果用先前地震性（> 2.5mW）的空间频率分布模式证实了结果。通过多频，双静电地面穿透雷达（GPR）的地球物理调查在Solani和Markanda排水盆地的皮埃蒙特 - 加密区域中的选择性位置进行，支持子表面沉积物层的主动变形。近表面沉积物层的明确偏移和翘曲表明在40 MHz和100 MHz Radargram上观察到索尔加里·州（俄罗斯省）（Uttarakhand及Up）附近的40 MHz和100 MHz Radargrams，以及靠近Toka Village附近在Markanda排水盆（HP）中。

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    Nath Somalin; Chatterjee R. S.; Mohanty S. P.; Gaurav Shashi;

  • 作者单位

    ISRO Indian Inst Remote Sensing Geosci Dept Dehra Dun 248001 Uttar Pradesh India;

    ISRO Indian Inst Remote Sensing Geosci Dept Dehra Dun 248001 Uttar Pradesh India;

    Indian Inst Technol Indian Sch Mines Dept Appl Geol Dhanbad 826004 Bihar India;

    ISRO Indian Inst Remote Sensing Geosci Dept Dehra Dun 248001 Uttar Pradesh India;

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  • 正文语种 eng
  • 中图分类 地质学;
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