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为了正确地解释重力资料并取得符合实际情况的结果,需要有新的重力模型,以便改进以往利用的二层模型。根据新近调查的地球物理地质资料,本文提出利用变密度多层结构的地壳重力模型。该模型以较简单的形式反映地壳内各层不同的特征:剖面内横向不均匀性由断块来决定;各层之间不存在明显的密度界面,而是梯度界面。由此,我们推导了截面为不等腰梯形的水平棱柱体的理论公式,编制了相应的程序,并在江西赣州—阳山进行了实际计算。结果与深地震测深的部分资料吻合较好。经验表明,选择初始模型对其效果十分重要。
In order to correctly interpret the gravity data and obtain realistic results, a new gravity model is needed in order to improve the two-layer model that has been used in the past. According to the geophysical and geologic data recently surveyed, this paper proposes a crust gravity model using a variable density multi-layer structure. The model reflects the different characteristics of each layer in the crust in a simpler form: the lateral inhomogeneity in the section is determined by the fault block; there is no obvious density interface between the layers but a gradient interface. Therefore, we deduced the theoretical formula of horizontal prism with non-isosceles trapezoid and programmed the corresponding program. The actual calculation was made in Ganzhou-Yangshan of Jiangxi Province. The result is in good agreement with some data of deep seismic sounding. Experience shows that choosing the initial model is very important for its effectiveness.