GSWA Boorabbin Multiclient 1996 1997 (P1071), 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 Boorabbin, Lk Johnstn Fugro multi-client surveys,WA, 1983-85,96,97 survey were acquired in 1987 by the WA Government, and consisted of 50598 line-kilometres of data at a line spacing between 200m and 200m, 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）数据用于测量由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（磁场强度高于正常背景场）与负异常（磁场强度低于正常背景场），其类型取决于岩石的磁化率。该数据集已通过标准化流程处理，以确保记录的磁场响应仅源自地下岩石。处理后得到的数据集可通过地质解译揭示地下地质结构。经GA的地球物理学家对处理后的数据开展质量核查，以确保GA发布的最终数据满足使用需求。本次测线数据集源自西澳大利亚州（Western Australia, WA）1983-1985年、1996年及1997年的Boorabbin、Lk Johnstn Fugro多客户勘探项目，该数据集由西澳大利亚州政府于1987年采集，总测线长度达50598测线公里，测线间距为200米至200米，地形离地高度为60米。为约束数据中的长波长分量，研究人员采用了独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据，以管控本次勘探数据的基准水平。本次勘探数据已基本校准至AWAGS基准。