龙门山地区介质密度的卫星重力数据反演

Inversion the medium density of Longmen mountain area using satellite gravity data

利用重力异常反演地球内部的介质密度分布,是研究地球内部精细结构的有效方法之一,这里利用EIGEN-6C2超高阶卫星重力场模型,计算龙门山地区的自由空间重力异常、布格重力异常以及剩余重力异常,在此基础上,基于Parker-Oldenburg模型以及粒子群算法反演该地区的三维介质密度分布,发现反演结果与Crust1.0密度模型所提供的结果基本一致,结果说明,使用Parker-Oldenburg模型结合粒子群算法反演地壳的三维密度分布,具有可行性和实用性。

Using gravity anomalies to invert the distribution of medium density inside the earth is one of the effective method for studying the fine structure of the internal Earth. In this paper, the ultra higher order satellite gravity model EIGEN-6C2 is used to calculate the free-air gravity anomaly, bouguer gravity anomaly and residual gravity anomaly of Longmen mountain area, and the PSO algorithm and the model of Parker-Oldenburg have been applied to invert the three-dimensional distribution of crustal density on this basis. The inverted results are agree with those of the Crust1.0 model, indicating that the method uses PSO algorithm bonding with the model of Parker-Oldenburg to inverse the three-dimensional crustal density distribution is feasible and practical.