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一、引言野外测定的褶皱往往被假定为圆筒状,因为这样容易用肉眼把投在赤平投影图上的极点环带拟合成一个大圆。人们往往避免用肉眼把表示圆锥状褶皱的极点环带拟合为一个小圆,因为这需要构筑相当于具有不同半顶角和轴倾角的圆锥的许多小圆,这就使作图很乏味,而且结果还不一定正确。因而,找出一种用数字表示的计算最佳拟合大圆和小圆的方法,配以区分它们的可靠统计学检验显然是有意义的。
I. INTRODUCTION Folds measured in the field are often assumed to be cylindrical because it is easier to fit the pole annulus cast on the stereographic projection to a large circle with the naked eye. It is often avoided to fit the polar annulus representing the conical folds to a small circle with the naked eye because it requires the construction of many small circles equivalent to cones having different half-top angles and axial angles, which makes the drawing very tedious, And the result is not necessarily correct. Thus, it is obviously interesting to find a numerical method of calculating the best-fit large and small circles, together with a reliable statistical test that distinguishes them.