'Earth-ionosphere' mode controlled source electromagnetic method
文献类型：期刊论文
| 作者 | Li, Diquan1; Di, Qingyun2; Wang, Miaoyue2; Nobes, David1 |
| 刊名 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 出版日期 | 2015-09-01 |
| 卷号 | 202期号:3页码:1848-1858 |
| 关键词 | Electromagnetic theory Magnetotellurics Magnetic anomalies: modelling and interpretation |
| DOI | 10.1093/gji/ggv256 |
| 文献子类 | Article |
| 英文摘要 | In traditional artificial-source electromagnetic exploration, the effects of the ionosphere and displacement current (DC) in the air were neglected, and only the geoelectrical structure of the earth's crust and upper mantle was considered, such as for controlled source audio-frequency magnetotelluric (CSAMT). By employing a transmitter (less than 30 kW) to generate source fields, the CSAMT method overcomes the problems associated with weak natural electromagnetic (EM) fields used in magnetotellurics. However, the transmitter is moved and the source-receiver offset is approximately less than 20 km, because of the limitation of emission energy. We put forward a new idea, that is, a fixed artificial source (greater than 200 kW) is used and the source location selected at a high resistivity region (to ensure a high emission efficiency), so there may be a possibility that as long as the source strength magnitude is strong enough, the artificial EM signal can be easily observed within a distance of several thousand kilometres. Previous studies have provided the evidence to support this idea; they used the 'earth-ionosphere' mode in modeling the EM fields with the offset up to a thousand kilometres. Such EM fields still have a signal/noise ratio over 10-20 dB; this means that a new EM method with fixed source is feasible. However, in their calculations, the DC which plays a very important role for large offsets was neglected. This paper pays much attention to derive the formulae of the 'earth-ionosphere' mode with a horizontal electric dipole source, and the DC is not neglected. We present some three layers modeling results to illustrate the basic EM field characteristics under the 'earth-ionosphere' mode. As the offset increases, the contribution of the conduction current decreases, DC and ionosphere were taken into account, and the EM field attenuation decreases. We also quantitatively compare the predicted and observed data. The comparison of these results with the data reveal the excellent agreement between the experimental and theoretical results. The DC and ionosphere affects the EM fields, however impedances (ratio of |
| WOS关键词 | ELF PROPAGATION ; WAVE-GUIDE ; WAVEGUIDE ; FIELDS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000360625500030 |
| 资助机构 | National Science Foundation of China(41204054) ; National Science Foundation of China(41204054) ; China Postdoctoral Science Foundation(20110490149) ; China Postdoctoral Science Foundation(20110490149) ; National Science Foundation of China(41204054) ; National Science Foundation of China(41204054) ; China Postdoctoral Science Foundation(20110490149) ; China Postdoctoral Science Foundation(20110490149) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62273]  |
| 专题 | 地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室 |
| 作者单位 | 1.Cent S Univ, Sch Geosci & Infophys, Changsha 410083, Hunan, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Diquan,Di, Qingyun,Wang, Miaoyue,et al. 'Earth-ionosphere' mode controlled source electromagnetic method[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2015,202(3):1848-1858. |
| APA | Li, Diquan,Di, Qingyun,Wang, Miaoyue,&Nobes, David.(2015).'Earth-ionosphere' mode controlled source electromagnetic method.GEOPHYSICAL JOURNAL INTERNATIONAL,202(3),1848-1858. |
| MLA | Li, Diquan,et al."'Earth-ionosphere' mode controlled source electromagnetic method".GEOPHYSICAL JOURNAL INTERNATIONAL 202.3(2015):1848-1858. |
入库方式： OAI收割
来源：地质与地球物理研究所
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