区域重力异常高精度实现异常转换的一个普遍方法

A General Method for High Precision Transformation of Regional Gravity Anomalies

应用Ⅲпемнпъх级数展开不同类型异常转换的频率特征,可以得到空间域级数求和法进行异常转换的诸系数.对延拓距分别为取数点距0.3, 0.5, 0.7, 1.0, 1.3, 1.5, 2.0倍的向下延拓、向上延拓、一阶垂向导数、二阶垂向导数的异常转换,求出了级数求和法的诸系数.从而实现了在原重力异常上一次等距取点求得各种不同的转换异常.通过模型理论计算值和利用上述方法算出的不同高度的延拓值进行对比,发现本法精度较高,可应用于区域重力异常的异常转换中,从而拓宽了重力转换异常的应用.

By using the frequency characteristics from the Schlomilch series expansion of different type anomaly transformation, a summation method of series in spatial domain has been developed to determine the coefficients for anomaly transformation. By different anomaly transformation methods, such as downward continuation upward cont nuation with different station spacings of the continuation distance, the first order vertical derivative and second order vertical derivative, coefficients for series summation method are determined and then the origional gravity anomaly at the equal station spacing once taken?will be transformed into one of different type. In comparison with the results of modeling and theoretical calculation for same height continuation, the method we introduced has a higher precison and could be used for regional gravity anomaly transformation.