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首页> 外文期刊>Pure and Applied Geophysics >Transverse Tectonics Structures in the Garhwal Himalaya Corridor Inferred from 3D Inversion of Magnetotelluric Profile Data
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Transverse Tectonics Structures in the Garhwal Himalaya Corridor Inferred from 3D Inversion of Magnetotelluric Profile Data

机译：Garhwal Himalaya走廊中的横向构造结构从MagnetOcellic简介数据的3D反演推断出来

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摘要

In the Garhwal Himalayan Corridor (GHC), we recorded the magnetotelluric (MT) data at 40 sites, in three phases. Out of these 40 sites, useful tipper or vertical magnetic field transfer function (VTF) data was available only at 19 sites. The resistivity model, obtained from 3D inversion of the MT data, is used to investigate the existence of transverse tectonic structures in the Garhwal Himalaya. Through a synthetic inversion experiment on scattered data over a profile, like our GHC profile, we have demonstrated that the MT data can be used to qualitatively infer about the off-profile resistivity structures within about 20 km from the profile. We carried out several 3D inversion experiments using different subsets of full impedance tensor and VTF responses individually and jointly to arrive at the final resistivity model. The 2D profile section of our 3D resistivity model explains the thrust tectonic and flat ramp flat geometry of the Main Himalayan Thrust (MHT). Furthermore, the inverted model delineated Delhi-Haridwar Ridge (DHR) as a highly resistive (> 1000 omega m) feature beneath the low resistive (< 50 omega m) sediments of the Indo-Gangetic Plain (IGP). The DHR continues up to the Inner Lesser Himalayan region, and it is bounded by two conductive (< 10 omega m) fluid-saturated fractured zones situated off-profile, and these run nearly parallel to the DHR. From the electrical image of the DHR and of the associated conducting feature, which have the geoelectric strike of N13 degrees E, we inferred that these features are transverse to the main Himalayan arc.
机译：在加尔瓦尔-喜马拉雅走廊（GHC），我们在40个地点分三个阶段记录了大地电磁（MT）数据。在这40个地点中，只有19个地点有有用的倾卸器或垂直磁场传递函数（VTF）数据。通过MT数据的3D反演获得的电阻率模型用于研究加尔瓦尔喜马拉雅地区横向构造的存在。通过对一个剖面（如我们的GHC剖面）上的分散数据进行合成反演实验，我们已经证明，MT数据可以用于定性推断距该剖面约20 km范围内的剖面外电阻率结构。我们分别和联合使用全阻抗张量和VTF响应的不同子集进行了几次3D反演实验，以获得最终的电阻率模型。我们的3D电阻率模型的2D剖面解释了主喜马拉雅逆冲断层（MHT）的逆冲构造和平坦斜坡-平坦几何结构。此外，倒置模型将德里-哈里瓦海脊（DHR）描绘为印度恒河平原（IGP）低电阻（<50Ωm）沉积物下方的高电阻（>1000Ωm）特征。DHR一直延伸到小喜马拉雅山脉内部区域，由两个位于剖面外的导电（<10Ωm）流体饱和裂缝带所包围，这些裂缝带几乎与DHR平行。根据DHR和相关导电特征的电子图像，其地电走向为N13°E，我们推断这些特征横穿喜马拉雅主弧。

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