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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Effect of Himalayan topography on two-dimensional interpretation of magnetotelluric data
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Effect of Himalayan topography on two-dimensional interpretation of magnetotelluric data

机译：喜马拉雅地形对大地电磁数据二维解释的影响

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摘要

Magnetotelluric method is a powerful tool for deep crustal studies of tectonically active mountainous regions such as the Himalaya, where logistic constraints severely limit the use of other artificial source electrical and electromagnetic methods. Topographic variations in mountainous regions distort apparent resistivity curves and thus lead to artefacts in interpreted models. In the present work, we have analysed a simplified two-dimensional (2D) model of the subsurface electrical resistivity structure along a profile in the Garhwal Himalaya for the effect of topography. The topography varies significantly along the profile between the foothills and the higher Himalaya. We first computed TE and TM-mode apparent resistivity and phase curves at various stations along the profile for a model with topography and then inverted these datasets for two cases. In the first case the surface of the earth was assumed to be flat, whereas in the second case the actual topography was included in the model. The results suggest that the interpreted model assuming flat earth is similar to the one obtained by including topography in the model. Inclusion of 10% Gaussian noise to the synthetic data does not change these results. Thus, we infer that the effect of 2D topography is not prominent in the 2D interpretation of the selected Garhwal Himalaya profile.
机译：大地电磁方法是对诸如喜马拉雅山等构造活动山区进行深地壳研究的有力工具，在这些地区，后勤方面的限制严重限制了其他人工来源的电磁方法的使用。山区的地形变化会使视电阻率曲线失真，从而导致解释模型中出现伪影。在目前的工作中，我们已经分析了沿Garhwal喜马拉雅山剖面的地下电阻率结构的简化二维（2D）模型，以了解地形的影响。地形沿山麓和喜马拉雅山较高处之间的轮廓变化很大。我们首先针对具有地形学的模型计算了沿剖面各个站点的TE和TM模式视电阻率和相位曲线，然后将这两种情况的数据集进行了反转。在第一种情况下，假定地球表面是平坦的，而在第二种情况下，模型中包括了实际地形。结果表明，假定模型为平地的解释模型与通过在模型中包括地形而获得的模型相似。将10％高斯噪声包含到合成数据中不会改变这些结果。因此，我们推断2D地形的影响在所选Garhwal Himalaya轮廓的2D解释中并不突出。

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