Everard, Giles, SA, 1982 (P593), 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 Everard, Giles, SA, 1982 survey were acquired in 1982 by the SA Government, and consisted of 31407 line-kilometres of data at a line spacing between 750m and 750m, 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）数据用于测量由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。研究团队通过标准流程对数据进行处理，确保所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验，确保GA发布的最终数据符合使用要求。本次1982年南澳大利亚州（South Australia, SA）埃弗拉德（Everard）、贾尔斯（Giles）区域的测线数据集，由南澳州政府于1982年采集完成，总测线长度达31407线千米，测线间距为750米至750米，地形离地高度为150米。为抑制数据中的长波长分量，研究人员采用澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据作为独立数据集，对本次调查数据的基准水平进行校正，本测区数据已基本匹配AWAGS的基准体系。