Dargo, Vic, 1996 VIMP Survey (GSV3061) (P690), 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 Dargo, Vic, 1996 VIMP Survey (GSV3061) survey were acquired in 1995 by the VIC Government, and consisted of 25965 line-kilometres of data at 200m line spacing and 80m 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）数据用于表征地壳内造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（磁场强度高于常规水平）与负异常（磁场强度低于常规水平），其类型取决于岩石的磁化率。该数据集通过标准处理流程进行处理，以确保所记录的响应仅由地下岩石引起。处理后生成的数据集可通过解译揭示地下地质构造。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。本次测线数据集源自维多利亚州达戈地区1996年VIMP测量（GSV3061）项目，由维多利亚州政府于1995年采集，总测线长度达25965测线公里，测线间距为200米，地形离地高度为80米。为约束数据中的长波长分量，研究人员采用澳大利亚全域航空地球物理测量（Airborne Geophysical Survey, AWAGS）航空磁测数据作为独立数据集，对本次测量数据的基准水平进行校正。本次测量数据已基本校准至AWAGS基准体系。