Thomson Complete Spherical Cap Bouguer geodetic 1vd

Gravity data measure small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.This Thomson Complete Spherical Cap Bouguer geodetic 1vd is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Thomson Orogen Gravity Survey (P201041). This gravity survey was acquired under the project No. 201041 for the geological survey of QLD. The grid has a cell size of 0.007 degrees (approximately 734m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 7620 gravity stations at 4000m spacing were acquired to produce this grid.

重力数据用于测量因地球表面下方岩石密度变化引发的微小重力变化。所采集的数据将通过标准流程进行处理，以确保记录的响应仅源于地下岩石的影响。经处理后得到的数据集可用于解译，以揭示地下地质构造。经处理的数据由GA地球物理学家开展质量核查，以确保GA发布的最终数据符合使用要求。本次的汤姆逊完整球冠布格大地测量1vd数据集，是针对汤姆逊造山带重力调查（P201041）的完整球冠布格异常网格的一阶垂直导数结果。该重力调查由编号为201041的项目承接开展，用于昆士兰州（QLD）的地质调查工作。该网格的单元尺寸为0.007度（约734米）。研究人员对原始网格应用快速傅里叶变换（Fast Fourier Transform, FFT）算法，以计算得到一阶垂直导数网格。本次调查共布设了7620个间距为4000米的重力测点，以此生成该网格数据。