Multifractal analysis of magnetotelluric data

摘要

We investigated the multifractal structure of the daily time series of apparent resistivity and phase of the magnetotelluric field measured in a site in southern Italy from the 9 of July 2007 to September 2011. The magnetotelluric parameters were computed in two orthogonal directions corresponding to 25 different sounding periods from about 0.75 s to 238 s. Our results indicate that the apparent resistivity and the phases are multifractal series. The multifractal degree of the phases approximately decreases with the increase of the sounding period; while that of the reistivity shows a more complex relationship with the sounding depth.