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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >2-D versus 3-D magnetotelluric data interpretation
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2-D versus 3-D magnetotelluric data interpretation

机译：2-D与3-D大地电磁数据解释

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摘要

In recent years, the number of publications dealing with the mathematical and physical 3-D aspects of the magnetotelluric method has increased drastically. However, field experiments on a grid are often impractical and surveys are frequently restricted to single or widely separated profiles. So, in many cases we find ourselves with the following question: is the applicability of the 2-D hypothesis valid to extract geoelectric and geological information from real 3-D environments? The aim of this paper is to explore a few instructive but general situations to understand the basics of a 2-D interpretation of 3-D magnetotelluric data and to determine which data subset (TE-mode or TM-mode) is best for obtaining the electrical conductivity distribution of the subsurface using 2-D techniques. A review of the mathematical and physical fundamentals of the electromagnetic fields generated by a simple 3-D structure allows us to prioritise the choice of modes in a 2-D interpretation of responses influenced by 3-D structures. This analysis is corroborated by numerical results from synthetic models and by real data acquired by other authors. One important result of this analysis is that the mode most unaffected by 3-D effects depends on the position of the 3-D structure with respect to the regional 2-D strike direction. When the 3-D body is normal to the regional strike, the TE-mode is affected mainly by galvanic effects, while the TM-mode is affected by galvanic and inductive effects. In this case, a 2-D interpretation of the TM-mode is prone to error. When the 3-D body is parallel to the regional 2-D strike the TE-mode is affected by galvanic and inductive effects and the TM-mode is affected mainly by galvanic effects, making it more suitable for 2-D interpretation. In general, a wise 2-D interpretation of 3-D magnetotelluric data can be a guide to a reasonable geological interpretation.
机译：近年来，涉及大地电磁方法的数学和物理3-D方面的出版物数量急剧增加。但是，在网格上进行现场实验通常是不切实际的，并且调查通常仅限于单个或广泛分离的剖面。因此，在许多情况下，我们发现自己面临以下问题：2D假设的适用性是否能从实际3D环境中提取地电和地质信息？本文的目的是探索一些具有指导意义的一般情况，以了解3-D大地电磁数据的2-D解释的基础，并确定哪个数据子集（TE模式或TM模式）最适合获得使用2-D技术的地下电导率分布。对简单的3-D结构生成的电磁场的数学和物理基础进行的回顾，使我们能够在2-D解释受3-D结构影响的响应的过程中优先选择模式。合成模型的数值结果和其他作者获得的实际数据证实了这一分析。该分析的一个重要结果是，不受3-D效应影响最大的模式取决于3-D结构相对于区域2-D撞击方向的位置。当3-D体垂直于区域打击时，TE模式主要受电流作用影响，而TM模式则受电流和感应作用影响。在这种情况下，TM模式的2D解释容易出错。当3D主体与区域2D碰撞平行时，TE模式会受到电流和感应效应的影响，而TM模式主要受到电流效应的影响，因此更适合于2D解释。通常，对3D大地电磁数据进行明智的2D解释可以指导合理的地质解释。

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