A modified interpolation-iteration method for gravity anomaly continuation from undulating surface to plane
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摘要: 重力异常曲化平即将起伏观测面上的重力异常延拓到平面上,从而为频率域处理和反演提供平坦观测面的重力异常数据。本文在常规插值—迭代法基础上,给出重力异常曲化平的改进插值—迭代法,即在异常迭代修正过程中引入起伏观测面修正因子,加快曲化平迭代收敛,促进曲化平效果提升。理论模型试验表明本文方法适用于观测面起伏较大、延拓跨度大的复杂条件下的稳定、有效曲化平,效果优于常规插值—迭代法。川滇地区实际重力异常数据试验表明本文曲化平方法有效增强了异常信号和细节特征,为后续处理和解释提供可靠数据。Abstract: Gravity anomaly continuation from undulating surface to plane can provide gravity data on a flat horizontal plane for frequency-domain data processing and inversion. Based on the theory of conventional interpolation-iteration methods, this study proposed a modified interpolation-iteration method by introducing a correction factor of the undulating observation surface in the iteration and correction process. The improved method accelerated the iterative convergence speed and promoted the continuation effects. The theoretical model-based tests show that this method can be used to achieve stable and effective large-span gravity anomaly continuation from greatly undulating surface to plane. The continuation results presented by this method are better than those obtained using conventional interpolation-iteration methods. The application of Bouguer gravity anomaly data of the Sichuan-Yunnan region demonstrates that the modified interpolation-iteration method effectively enhanced anomalous signals and details and can provide reliable data for subsequent processing and interpretation.
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