2:45 PM - 3:00 PM
[SEM16-05] A novel static shift correction method based on evaluation of statistical properties of MT responses
Keywords:Magnetotelluric, Geostatistics, Variogram, static shift
In this study, we discuss on the characteristics of the spatial distribution of MT responses on a simple three-dimensional (3D) resistivity structure, and also those affected by static shift. We investigated the spatial correlation of MT responses using a variogram, developed in the geostatistics. The degree of influence of static shift on MT response was also evaluated by the same method. As a result, we found a spatial range in which the apparent resistivity has a correlation. The range was greatly reduced when a static shift was given. In addition, we found that the range of the apparent resistivity is similar or wider than one of the phase. Based on this relationship, we developed a new method to correct the effect of static shift by appropriate spatial smoothing of the apparent resistivity. Our method was tested using 2D/3D numerical simulations. It is concluded that the accuracy of underground resistivity structure analysis was improved.