GSWA Southwest Yilgarn Gravity P201561 Complete Spherical Cap Bouguer Anomaly 267GU 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 GSWA Southwest Yilgarn Gravity P201561 Complete Spherical Cap Bouguer Anomaly 267GU 1VD is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the Southwest Yilgarn Gravity Survey (P201561). This gravity survey was acquired under the project No. 201561 for the geological survey of WA. The grid has a cell size of 0.00484 degrees (approximately 498m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid. A total of 23762 gravity stations at 2000m spacing 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场变化。所采集的数据将通过标准流程进行处理，以确保记录得到的响应仅源于地下岩石的影响。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GSWA西南伊尔加尔重力P201561完整球冠布格异常（spherical cap Bouguer Anomaly）267GU 1VD，它是西南伊尔加尔重力调查（P201561）对应完整球冠布格异常网格的一阶垂直导数。本次重力调查为西澳大利亚州（Western Australia, WA）地质调查项目编号201561项下所采集。该网格的单元尺寸为0.00484度（约合498米）。研究人员采用快速傅里叶变换（Fast Fourier Transform, FFT）算法对原始网格进行处理，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23762个间距为2000米的重力测点。