Details of the Abstract
| Title of paper | Sensitivity of Magnetotelluric Inter-station Transfer Functions |
| List of authors | Gang, W., Bo, Y., Xiaolei, W., Yixian, X. |
| Affiliation(s) | School of Earth Sciences, Zhejiang University, Hangzhou, China. |
| Summary | In two-dimensional (2D) and three-dimensional (3D) environments, magnetotelluric (MT) data is sensitive not only to the geoelectric structure below the site but also to any lateral anomalies around the measuring site. The lateral resolution of data inversion is related to the spacing of the site, while the depth resolution is related to the frequency. However, the existing theory does not provide a specific quantitative relationship between resolution and these variables. The sensitivity matrix provides a quantitative description of the impact of varying each model parameter on the data, thereby offering a valuable tool for analysing the resolution of data to the model. We developed a synthetic model to analyse the sensitivity of MT transfer function (impedance Z and vertical magnetic transfer function T) and horizontal magnetic interstation transfer function (M) in different geoelectric structures. The results demonstrate that: (1) M is sensitive to the conductor and almost unaffected by low resistance shielding effects; (2) M has an approximate sensitivity amplitude to T (much smaller than that of Z, but the inclusion of the reference station makes the range of influence of M on lateral geoelectric structures much larger than that of T. In general, we believe that the resolution of anomalies beneath conductor and shallow geoelectric structures could probably be greatly improved if M were added to the inversion. |
| Session Keyword | 2.0 EM theory, modelling and Inversion |
| File upload |
2.0_sensitivity_of_magnetotel_wen.pdf
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