Comparison Study on Land Subsidence at 3 Megacities in Indonesia by Means of Recent Integrated Geodetic Observation Methods

我们建立了迄今为止很少用于沉降研究的现场绝对重力仪（Micro-g LaCoste A10）的测量程序，并在印度尼西亚雅加达和万隆进行了重复测量，成功地检测了由于地面沉降引起的重力变化。此外，通过与GPS和InSAR（干涉合成孔径雷达）等最新空间大地测量技术的重力数据进行比较，我们发现雅加达的地面沉降可能是由于地下水的过度抽取。

We have established the measurement procedure of a field absolute gravimeter(Micro-g LaCoste A10) which has been rarely utilized for the subsidence studies so far, and have successfully detected the gravity changes due to the ongoing land subsidence by conducting the repeated measurements in Jakarta and Bandung, Indonesia. In addition, comparing the gravity data with those of the recent space geodetic techniques such as GPS and InSAR(Interferometric Synthetic Aperture Radar), we revealed that the land subsidence in Jakarta was probably due to the excess pumping of the groundwater.