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首页> 外文会议>International Symposium on Three-Dimensional Electromagnetics >ON THE DETERMINATION OF THE ELECTRICAL 3-D CONDUCTIVITY DISTRIBUTION BENEATH ICELAND WITH LONG-PERIOD MAGNETOTELLURICS
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ON THE DETERMINATION OF THE ELECTRICAL 3-D CONDUCTIVITY DISTRIBUTION BENEATH ICELAND WITH LONG-PERIOD MAGNETOTELLURICS

机译：用长期磁通学测定冰岛下面的电气3-D电导率分布

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The cause for Iceland's existence is assumed to be the upwelling of a hot mantle plume. An important result of more than 200 magnetotelluric (MT) measurements over the last decades is a layer of increased conductivity at an average depth of 10 km within the Icelandic crust. Three-dimensional (3-D) model studies show the effects of various conductivity structures on the magnetotelluric transfer functions for periods between 10 and 100.000 s. In particular the resolution of the plume structure and the influence of the highly conductive seawater is discussed. The assumed plume can be detected for a plume-host conductivity contrast > approx 3. Using these values, it is possible to differentiate between the highly conducting crust layer and the plume head as they show a characteristic pattern at clearly separated period ranges in the magnetotelluric transfer functions. Thus the influence of the crustal conductor does not mask the effect of an assumed plume structure. Also the influence of the seawater does not shield the effects of the mentioned conductive zones in crust and mantle; however, the coast effect can be detected up to 50 km inside the island. An assumed plume stem cannot be detected in the model results.
机译：冰岛存在的原因被认为是热披风羽流的上升。在过去十年中，超过200磁场（MT）测量的一个重要结果是在冰岛地壳中平均10公里的平均深度增加了一层。三维（3-D）模型研究表明各种电导结构对10至100.000秒之间的周期的各种电导率结构的影响。特别是讨论了羽流结构的分辨率和高导电海水的影响。可以检测假设的羽流量对于羽毛主机电导率对比度>约3.使用这些值，可以区分高导电的地壳层和羽毛头，因为它们在磁音刷中明确分离的时段范围显示特征图案传递函数。因此，地壳导体的影响不会掩盖假设的羽状结构的效果。海水的影响也不会屏蔽上述导电区在地壳和地幔中的效果;然而，海岸效果可以在岛内检测到50公里。在模型结果中不能检测到假设的羽流阀。

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