基于等效源的重力异常空间导数计算方法及其在川滇地区的应用

在综合分析前人研究成果的基础上, 采用基于贝叶斯准则的等效源模型滤波增强方法来识别地质体边界。 通过理论模型实验讨论了在相同的噪声水平情况下, 不同算法对于计算结果的影响, 模型实验结果表明, 与直接计算和传统高斯滤波增强技术相比, 新算法可以有效消除传统算法中普遍存在的对于噪声的过度敏感问题, 所得到的地质体边界形态失真更小。 随后, 利用此方法对川滇地区的重力数据进行了处理, 并对该地区的重力水平总梯度(THD)、 重力垂直梯度模(AVG)、 重力解析信号模量(AAS)、 重力水平梯度垂向导数(VGHD)应用效果进行了对比分析。 研究结果提供了川滇地区的构造分区信息, 对该地区构造演化、 边界定位及动力学过程分析具有重要的指导意义。

Calculative Method of Spatial Derivatives of Gravity Anomaly based on Equivalent Source and Its Application in Sichuan-Yunnan Region

Based on the comprehensive analysis of previous research results,an equivalent source model filtering and enhancement method based on Bayesian criteria is used to identify the boundary of geological bodies.Through the theoretical model experiment,we discussed the noise level in the same circumstances,the influence of different algorithms for the calculation results.The model experimental results show that compared with the direct calculation and the traditional Gaussian filtering enhancement technique,the new algorithm can effectively eliminate the traditional algorithm in common to the problem of noise of overly sensitive geological boundary shape distortion smaller.Subsequently,this method was used to process the gravity data in Sichuan-Yunnan region,and the application effects of amplitude of vertical gradient(AVG),total horizontal gravity gradient(THD),amplitude of analytic signal(AAS),and vertical gradient of total horizontal derivative(VGHD)of this region were compared and analyzed.The results of this study provide the information of tectonic zoning in the Sichuan-Yunnan region,and have important guiding significance for tectonic evolution,seismic distribution and related dynamic analysis for this region.