Numerical Data Processing for Graphic Presentations of Geological Structure on the Basis of Dip-Strike Data from the Honjyo Area, Akita Prefecture, Japan

Abstract

In this paper, we tried to analyze numerically the geological structures in the northern Honjyo Area, Akita Prefecture, using methods presented by Ohmae et al. (1985a, b) as follows: (1) we collected 377 dip-strike data from the northern part of the geological map of the Honjyo Area (1: 50, 000) published by the Geological Survey of Japan, (2) converted them to the normal vectors of beds, (3) estimated the dip-strikes at grid points by the weighted averages of the normal vectores to show the areal folding structure as the strike-line maps, and (4) estimated apparent dips at 153 points of 100 m interval to draw three kinds of geological sections using Shiono et al. (1984a, b, c) 's programs. The results were compared with the folding structure and the geological section shown in the original geological map to evaluate the methods used for numerical geological data processing.