利用InSAR技术分析昆明城区地面沉降对重力异常的影响

首先利用重力归算原理推导高程变化对重力观测值的影响，计算因高程变化导致重力布格异常改正、空间改正和层间改正。然后利用昆明市多年的InSAR影像资料，计算城区地面沉降变化量，在重力数据处理过程中结合InSAR技术得到地表沉降变化量，以及因地质密度变化引起的精确的重力值，进而计算得到该部分变化对昆明地区重力异常的影响情况。本文结合重力异常在地震方面的应用，说明提高重力测量精度在地质灾害中的意义。

Analysis of influence of ground settlement on gravity anomaly in urban Kunming based on InSAR technique

The principle of gravity reduction is used to deduce the effect of elevation change on the gravity observations, and the correction of gravity Bouguer anomalies, spatial corrections, and interlayer corrections due to elevation changes are calculated. Combining the years of InSAR image data of Kunming city, this paper calculates the amount of land subsidence change in the urban area. In the process of gravity data, combines InSAR technology to obtains the surface subsidence variation, obtains the accurate gravity value due to the change of geological density, and then calculates the change of the part. The impact of gravity anomalies on the Kunming area, combined with the application of gravity anomalies in earthquakes, illustrates the importance of improving the accuracy of gravity measurements in geological hazards.