Arafura Sea, NT, 1988 (P560), 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 Arafura Sea, NT, 1988 survey were acquired in 1988 by the NT Government, and consisted of 31761 line-kilometres of data at a line spacing between 2000m and 2000m, and 300m 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）数据用于衡量地壳中成岩矿物含量差异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），具体取决于岩石的磁化率。该数据通过标准处理流程进行加工，以确保记录的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。经处理的数据由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1988年北领地（Northern Territory, NT）阿拉弗拉海勘探项目的测线数据集，由北领地政府于1988年采集，总测线长度达31761测线公里，测线间距为2000米至2000米，飞行离地高度为300米。为约束数据中的长波长成分，本次勘探采用独立数据集——全澳大利亚航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对测线数据的基准水平进行校正。本次勘探数据已基本校准至AWAGS基准。