Geoscientific research for long-term stability of the geological environment, Advanced technology for exploration of magma and hydrothermal fluid; Development of data processing technique for MT data

Negi, Tateyuki; Umeda, Koji

MT survey has been applied to various fields in recent years. It is recognized as an effective method for identifying deep resistivity structures in the crust. However, it is difficult to acquire high quality data in highly noisy environments because natural electromagnetic fields are used in the MT survey. To apply MT survey in such environments, it is important to develop a robust stacking method to improve the quality of the MT spectrum data. At the last SEGJ conference held in Spring 2007, we have reported a new effective and robust stacking method based on MT reliability index (Negi et al., 2005). In this study, we report the development of the robust smoothing method for MT data to be with the robust stacking method for EDI files. Applied to poor quality data, it improved the data to interpretable data in a short time. Therefore, it is expected to be effective and practical method for improving poor quality data.