利用岩层产状确定褶皱的几何函数

Fitting Fold Funtion from Layer Strike-dip Data

经典的构造地质理论常以傅里叶级数对褶皱形态进行拟合，并根据褶皱层面不同位置的坐标值来确定傅里叶系数，进而用系数ｂ＿３／ｂ＿１比值来判别褶皱形状。现通过对褶皱层面产状的系统测定来求解傅里叶级数，并提出了判别褶皱形状的切线比图解。

ourier series was used to fit a fold shape in traditinonal ideas of structural geology.Its coefficients are gotten according toseveral coordinate values of a fold laver. The ratio b_3/b_1 is used to distinguish the shape type of a fold.After discussing the rela-tionship between the fourier series and the strike-dip of a folded layer, the authors give a new thinking for getting fourier coeffi-cients and suggest a tangent ratio graph used to distionuish the shape type of a fold.