Wiluna Gravity Survey P201660 Spherical Cap Bouguer Anomaly 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. This Wiluna Gravity Survey P201660 Spherical Cap Bouguer Anomaly 1VD is the first vertical derivative of the spheical cap Bouguer anomaly grid for the Wiluna Gravity Survey (P201660). This gravity survey was acquired under the project No. 201660 for the geological survey of WA. The grid has a cell size of 0.0076 degrees (approximately 800m). A total of 4453 gravity stations at variable spacing between 1000m and 2500m were acquired to produce this grid. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.

重力数据用于测量地球表层下方岩石密度变化所引发的微小重力变化。所采集的重力数据将通过标准化流程进行处理，以确保记录得到的响应仅由地下岩石产生。经处理后得到的数据集可通过地质解译，用以揭示地下地质构造。本数据集为威卢纳重力测量（Wiluna Gravity Survey，项目编号P201660）的球冠布格重力异常（Spherical Cap Bouguer Anomaly）网格的一阶垂直导数，正式命名为威卢纳重力测量P201660球冠布格重力异常1VD。该重力测量工作以项目编号201660实施，服务于西澳大利亚州地质调查项目。该网格的单元尺寸为0.0076度（约合800米）。为生成该网格，共采集了4453个重力测点，测点间距介于1000米至2500米之间。本次一阶垂直导数网格的计算采用快速傅里叶变换（Fast Fourier Transform, FFT），对原始球冠布格重力异常网格进行运算得到。经处理的数据将由GA地球物理学家开展质量校验工作，以确保GA发布的最终数据符合使用需求。