Officer Basin (Wyola, Maurice), SA, 1982 (82SA18) (74kk) (P474), 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 Officer Basin (Wyola, Maurice), SA, 1982 (82SA18) (74kk) survey were acquired in 1982 by the SA Government, and consisted of 9113 line-kilometres of data at 3000m 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.

总磁场强度（Total Magnetic Intensity, TMI）数据用于表征地壳内造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（磁场强度高于正常背景场）与负异常（磁场强度低于正常背景场），具体取决于岩石的磁化率。该数据集采用标准流程进行处理，以确保所记录的磁场响应仅由地下岩石引起。经处理后得到的数据集可通过解译揭示地下地质构造。GA地球物理学家会对处理后的数据开展质量核查，以确保GA发布的最终数据符合使用要求。本次介绍的测线数据集源自1982年由南澳州政府采集的南澳大利亚州奥弗尔盆地（怀奥拉、莫里斯）航空物探调查（编号82SA18，数据量74kk），该测线总长9113千米，测线间距为3000米，飞行离地高度为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——全澳航空物探调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次调查数据的基准面进行校正。本次调查数据已基本匹配AWAGS基准面。