Eucla Coast, WA, 2009 (Eucla Basin 6 offshore) (P1213), 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 Eucla Coast, WA, 2009 (Eucla Basin 6) survey were acquired in 2009 by the WA Government, and consisted of 122145 line-kilometres of data at a line spacing between 200m and 200m, and 50m 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）数据用于测量地球磁场强度的变化，此类变化由地壳中成岩矿物的含量差异所引发。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），具体类型取决于岩石的磁化率。该数据集通过标准流程进行处理，以确保记录的响应仅源于地下岩石。经处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据已由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。本次欧克拉海岸（西澳大利亚州，Western Australia, WA，2009年，欧克拉盆地6号）调查的测线数据集，由西澳大利亚州政府于2009年采集，总数据覆盖长度达122145测线千米，测线间距为200米至200米，飞行地形离地高度为50米。为约束数据中的长波长分量，本次调查采用独立数据集——澳大利亚全域航空地球物理调查（Airborne Geophysical Survey, AWAGS）航空磁测数据——对调查数据的基准水平进行校正。本次调查数据已基本匹配AWAGS基准。