Murray Basin (Hay Narrandera Deniliquin Jerilderie) magnetics (non-AWAGS)

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.

总磁强度（Total Magnetic Intensity, TMI）数据用于测量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）两类，具体取决于岩石的磁化率。该数据通过标准流程进行处理，以确保所记录的响应仅源于地下岩石。处理所得数据集可通过地质解译揭示地下地质结构。经处理的数据将由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。本次提供的测线数据集来自新南威尔士州政府1987年采集的墨累盆地（Hay、Narrandera、Deniliquin、Jerilderie区域）1987年航次（编号GSV0377），共包含55220线公里的数据，测线间距为1500米，地形离地高度为150米。