Perth, Kellerberrin, Pinjarra, Corrigin, WA, 1972/73 (P401), 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 Perth, Kellerberrin, Pinjarra, Corrigin, WA, 1972/73 survey were acquired in 1972 by the WA Government, and consisted of 34801 line-kilometres of data at 1500m line spacing 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）数据用于量化地壳中成岩矿物成分差异所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），其类型取决于岩石的磁化率。该数据通过标准流程进行处理，以确保记录的磁场响应仅源自地下岩石。处理后得到的数据集可通过地质解译揭示地下地质构造。GA地球物理学家对处理后的数据开展质量检查，以确保GA发布的最终数据符合使用要求。这套测线数据集源自1972/73年在西澳大利亚州（WA）珀斯、凯勒贝林、平加拉、科里金地区实施的航空勘测，由西澳大利亚州政府于1972年采集，总测线长度达34801公里，测线间距为1500米，地形离地高度为150米。为约束数据中的长波长分量，研究人员采用独立数据集——全澳航空地球物理勘测（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次勘测数据的基准面进行校正。本次勘测数据实质上已校准至AWAGS基准。