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利用重力异常构建壳幔密度结构,是获取地球内部物性参数、岩石结构的方法之一,可以为研究地球动力学演化过程提供约束.直接观测到的重力异常是获取壳幔密度结构的重要资料.重力异常是不同深度物质产生的重力场的叠加,针对不同的研究区域,需要对重力异常进行必要的分离;在此基础上,可以通过正演拟合和反演方法等途径获得壳幔密度结构.正演拟合可以获得精细壳幔密度结构,但需要较强的先验约束信息,受主观人为的因素影响较大.反演方法计算快,人为因素影响较小,但获得壳幔密度结构具有平滑的特征,难以得到精细密度结构.反演结果对初始模型有一定的依赖性,非唯一性较强.
Using the gravity anomaly to construct the crustal density structure is one of the methods to obtain the physical property parameters and the rock structure of the earth, which can provide the constraint for the study of the evolution of the geodynamics. The directly observed gravity anomaly is an important material for obtaining the crustal density structure. The gravity anomaly is the superposition of the gravitational fields generated by different depths of material. For different research areas, gravity anomalies need to be separated. Based on this, the structure of crust-mantle density can be obtained by forward fitting and inversion methods The forward fitting can obtain the fine crust-mantle density structure, but requires a strong priori constraint information, which is greatly affected by the subjective human factors.The inversion method is fast and has little influence from human factors but obtains the crust-mantle density structure It has the characteristics of smoothness and it is difficult to get the fine density structure.The inversion results have certain dependence on the initial model and strong non-uniqueness.