Tennant Creek-Mt Isa (TISA) Gravity Surveys, South West McArthur (CSCBA 1VD grid)

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 Tennant Creek-Mt Isa (TISA) Gravity Surveys, South West McArthur (CSCBA 1VD grid) is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Tennant Creek-Mt Isa (TISA) Gravity Surveys, South West McArthur Barkley, Northern Territory, 2019. This gravity survey was acquired under the project No. 201901 for the geological survey of NT, QLD. The grid has a cell size of 0.00461 degrees (approximately 500m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 5855 gravity stations at a spacing between 2000m and 4000m were acquired to produce this grid.

重力数据用于测量地球表层下方岩石密度变化引发的微小重力变动。所采集的数据将通过标准流程处理，以确保记录得到的响应仅由地下岩石引起。经处理得到的数据集可通过解译揭示地下地质构造。经处理的数据将由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。本数据集为麦克阿瑟-巴克利西南区域的坦南特克里克-芒特艾萨（Tennant Creek-Mt Isa，简称TISA）重力调查项目的CSCBA 1VD网格数据，它是2019年北领地坦南特克里克-芒特艾萨重力调查项目（麦克阿瑟-巴克利西南区域）完整球冠布格异常网格的一阶垂直导数结果。本次重力调查是为北领地（NT）与昆士兰州（QLD）的地质调查工作，依托项目编号201901实施开展的。该网格的单元尺寸为0.00461度（约合500米）。研究人员采用快速傅里叶变换（Fast Fourier Transform，简称FFT）算法对原始网格数据进行处理，以计算得到一阶垂直导数网格。为生成该网格，本次调查共采集了5855个重力测点，测点间距介于2000米至4000米之间。