Murray Basin (Hay, Narrandera, Deniliquin, Jerilderie), NSW, 1987 (GSV0377) (P546), 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 Murray Basin (Hay, Narrandera, Deniliquin, Jerilderie), NSW, 1987 (GSV0377) survey were acquired in 1987 by the NSW Government, and consisted of 55220 line-kilometres of data at 1500m line spacing and 150m 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（磁场强度高于正常值）与负异常（磁场强度低于正常值），其类型取决于岩石的磁化率。该数据通过标准处理流程进行预处理，以确保记录的磁场响应仅源于地下岩石。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发布的最终数据满足使用需求。本次测线数据集源自1987年新南威尔士州（New South Wales, NSW）政府实施的墨累盆地（Hay、Narrandera、Deniliquin、Jerilderie区域）航空磁测（GSV0377），共包含55220测线公里的有效数据，测线间距为1500米，飞行离地高度为150米。为约束数据中的长波长分量，本次测线数据以独立数据集——全澳航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——为基准开展基准电平校正。本次测线数据基本已基于AWAGS数据完成平差处理。