Transfer function measured by electromagnetic sounding with an accurately controlled signal
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- Yokoyama Yukiko
- Tono Geoscience Center, Japan Nuclear Cycle Development Institute, Japan
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- Kumazawa Mineo
- Tono Geoscience Center, Japan Nuclear Cycle Development Institute, Japan
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- Nakajima Takahiro
- Tono Geoscience Center, Japan Nuclear Cycle Development Institute, Japan
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We present the fundamentals of an electromagnetic sounding with an accurately controlled source signal. In this method, the tensor transfer function between transmitted and received vector electromagnetic fields is measured. We formulated the transfer function by introducing a ray model that describes the propagation of the general electromagnetic field in the whole frequency region. The transfer function includes information of the underground structure: electromagnetic parameters, propagation distance, and boundary planes. The information of the electromagnetic parameters and the propagation distance is commonly described in all the tensor elements. It is in a form of complex functions of frequency. The information concerning the boundary planes is described as real coefficients of the complex functions. The coefficients are different for each of the tensor elements. When we use an accurately controlled signal, we can estimate the information as a linear inversion problem. A profile of the transfer function varies with the frequency region: it decays rapidly in the low-frequency region and oscillates in the high-frequency region. Such a profile can be explained by the approximate form of the transfer function: a sum of complex exponential functions in a narrow frequency band. The approximate form also provides a good model for data decomposition.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 54 (5), 459-472, 2002
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390001206514128896
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- NII論文ID
- 10008600202
- 130003780897
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 6166043
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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