Pilbara, Hamersley, Bangemall Basins (Rudall, Gunanya, Trainor, Tabletop), 1984 (P498), magnetic line data, AWAGS levelled

Total magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The data 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. These line dataset from the Pilbara, Hamersley, Bangemall Basins (Rudall, Gunanya, Trainor, Tabletop), 1984 survey were acquired in 1984 by the WA Government, and consisted of 58500 line-kilometres of data at a line spacing between 1500m and 1500m, and 150m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.

总磁强度（Total Magnetic Intensity, TMI）数据可测量由地壳中成岩矿物成分差异引发的地球磁场强度变化。磁异常可分为正异常（磁场强度高于正常值）与负异常（磁场强度低于正常值），具体取决于岩石的磁化率。该数据集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。处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据会由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1984年测量的测线数据集源自皮尔巴拉、哈默斯利、班格马尔盆地（鲁多尔、古纳亚、特雷诺、桌山区域），由西澳大利亚州政府于1984年采集，总测线长度达58500测线公里，测线间距为1500米，飞行离地高度为150米。为压制数据中的长波长分量，研究人员采用了独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——来校正本次测量数据的基准面。本次测量数据已基本校准至AWAGS基准。