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| | Abstract | | The remote reference technique is widely used in the magnetotelluric method to decrease local noise by acquiring data simultaneously at a remote site. This technique can reduce the local noise component by stacking the cross power spectrum between the remote data and field data. Remote reference is especially efficient when applying ideal remote data with no noise component. Hence, the ideal remote sites for surveys are as noise-free as possible. Yet it is usually difficult, in practical surveys, to find remote sites that fit this ideal. The best way to compensate in such a difficulty is to apply multiple remote reference method using robust weighted stacking. With multiple remote sites we can expect the same effect obtainable from an ideal remote site without noise. However, because acquiring multi-remote data takes time and labors, it is difficult to acquire multi-remote data in every surveys. Therefore we carried out synthetic studies to examine the influence of the remote noise on the magnetotelluric survey. As a result, the influence of remote noise was greater when the survey field has huge noise. It indicates that multiple remote reference method using robust weighted stacking is more required when the survey field has huge noise. |
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