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首页> 外文期刊>Earth, planets and space: EPS >Magnetic distortion of GDS transfer functions: An example from the Penninic Alps of Eastern Switzerland revealing a crustal conductor
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Magnetic distortion of GDS transfer functions: An example from the Penninic Alps of Eastern Switzerland revealing a crustal conductor

机译：GDS传递函数的磁畸变：以瑞士东部的Penninic阿尔卑斯山为例，揭示了地壳导体

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We carried out sixty-four MT and GDS soundings in the eastern Swiss Alps to obtain information on the electrical conductivity distribution. One of the main findings is an anomalous directional behaviour of the real induction arrows over the entire period range (T=1-300s) on the Bundnerschiefer. The Bundnerschiefer occurs between the crystalline Aar and Gotthard massives to the North and the crystalline Penninic nappes (Adula, Tambo, Suretta) to the South within the investigation area. The sediments form an elongated eastwards plunging ramp with a possible conductive link to the Northern Swiss Permo-carboniferous trough (Molasse basin). We consider electric currents induced in various local and regional conductive structures and leaking into the Bundnerschiefer as possible causes for the observed effect upon the electromagnetic field. Applying Hypothetical Event Analysis (HEA) we find a spatial decoupling of the induction processes with depth and a conductivity anomaly presumably due to the northward indentation by the Adriatic plate.
机译：我们在瑞士阿尔卑斯山东部进行了64次MT和GDS探测，以获取有关电导率分布的信息。主要发现之一是在Bundnerschiefer上的整个周期范围（T = 1-300s）内，实际感应箭头的定向行为异常。在调查区域内，Bundnerschiefer发生在北部的Aar和Gotthard晶体块与南部的Penninic尿布（Adula，Tambo，Suretta）之间。沉积物形成一个向东延伸的细长斜坡，并可能与北部的瑞士二叠纪-石炭纪海槽（Molasse盆地）形成导电联系。我们认为在各种局部和区域导电结构中感应并泄漏到Bundnerschiefer中的电流是观察到的对电磁场影响的可能原因。应用假设事件分析（HEA），我们发现感应过程与深度和电导率异常的空间解耦可能是由于亚得里亚海板块向北凹陷所致。

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