抄録
Contour maps are available to cease overall features of physical quantity, such as elevation, temperature and so on, distributing in a specified area and based on measurement at finite points. If data for contour mapping are obtained from an area interrupted geologically by deformation, e.g. faulting and/or fracturing, it is desirable that such geological heterogeneity is taken into account when the contour map is made. Therefore, in order to make contour maps under the consideration of such geological heterogeneity, we developed a method for contour mapping by using algebraical expressions for lines of formation boundaries and complex functions for contour lines.
When estimating potential of geothermal resources, it is necessary to know distribution of initial temperature, namely rock mass temperature in a natural state just before development of geothermal resources. For this reason, we applied the method to contour mapping of the distribution of the initial temperature in the Matsukawa geothermal field and consequently obtained a reasonable result reflecting the geologic information of this field.
