Effective stacking method for MT spectrum data

Negi, Tateyuki; Umeda, Koji; Asamori, Koichi

MT survey has been applied to various fields in recent years. It is recognized as effective method to know deep resistivity structure. However, it is difficult to acquire interpretable 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 robust stacking method to improve the quality of MT spectrum data. We developed robust stacking method based on MT reliability index shown in Negi et al (2005). As a result of application to MT spectrum data contaminated by much noise, it was improved to interpretable quality data. Therefore, it is expected to be effective stacking method for the MT survey in highly noisy environments.