Curnamona, SA, Broken Hill Exploration Initiative, 1995 (P628), 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 Curnamona, SA, Broken Hill Exploration Initiative, 1995 survey were acquired in 1995 by the SA Government, and consisted of 62542 line-kilometres of data at a line spacing between 100m and 100m, and 60m 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）数据可用于衡量地壳中成岩矿物组分差异所引发的地球磁场强度波动。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）两类，其分类取决于岩石的磁化率。该数据集通过标准处理流程开展预处理，以确保所记录的磁场响应仅源自地下岩石。经处理后得到的数据集可通过解译揭示地下地质结构。预处理后的数据会由GA地球物理学家进行质量核查，以确保GA发布的最终数据符合使用需求。本次测线数据集来自1995年实施的南澳大利亚州（South Australia, SA）卡纳莫纳地区布罗肯希尔勘探计划（Broken Hill Exploration Initiative）勘探项目，由SA政府于1995年采集完成，总测线长度达62542测线公里，测线间距为100米至100米，飞行离地高度为60米。为约束数据中的长波分量，研究人员采用独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次勘探数据的基准值进行校正。本次勘探数据实质上已参照AWAGS数据完成基准面平差。