A structure of the decorating shell for a ceiling fan includes an outer shell and a decorating cover. The pivot rod connection interface cover is composed of a base member and a cover member rotatively connected thereto. An ink absorbing member is provided on the bottom of the inner space. Each channel is configured and dimensioned for receiving a portion of the longitudinal member along its circumference. The method includes selecting a geologic layer represented in the seismic image determining by stratigraphic modeling a mean topographic depositional surface for said layer deforming the seismic image by displaying the traces by taking account of the modeled mean depositional surface; and carrying out a geologic interpretation of the image thus deformed.