Edjudina, WA, 1984, 1988/89 (P580), 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 Edjudina, WA, 1984, 1988/89 survey were acquired in 1984 by the WA Government, and consisted of 52720 line-kilometres of data at 400m line spacing and 100m 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）数据用于测量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（磁场强度高于正常水平）与负异常（磁场强度低于正常水平），具体取决于岩石的磁化率。该数据集通过标准化流程处理，以确保记录的响应仅源自地下岩石。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、1988/1989年开展的埃迪贾纳（Edjudina，WA）勘测项目的测线数据集，由西澳政府于1984年采集，涵盖总长度52720千米的测线数据，测线间距为400米，地形离地高度为100米。为压制数据中的长波长信号，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水平进行校正。本次勘测数据已基本匹配AWAGS的基准水准。