互いに直交に近い面上の歪楕円を用いる直交平均歪解析法の実用性

概要

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I have proposed three techniques for three dimensional strain analysis, that is, the orthogonal average method, the oblique average method and the least square method (Hayashi; 1994, 1995). The orthogonal average method is the simplest technique in terms of its easiest computer coding and simplicity to prepare input data. In spite of the convenience of the orthogonal average method, there is a difficulty to cut three exactly mutually perpendicular sections from oriented rock samples. The orthogonal average method cannot be used properly unless strain ellipses are obtained from three orthogonal sections. We can calculate the mutually perpendicular planes from any subperpendicular planes of rock samples. Using the newly constructed orthogonal coordinate system and composing the strain ellipses described on the system, the strain ellipsoid can be estimated. I call the technique as "practical average method". The practical average method is useful and the difference between the estimated strain ellipsoids which are calculated by the practical average method and by the least square method is conveniently small, if the difference between the original oblique axes and the newly constructed orthogonal axes are less than 10° and c value is less than 0.1 in the case of strain analysis on the Kayo sandstone (Hayashi; 1988, 1989).
構造地質研究会の論文