Western Tasmania, Tas, 2001 (WTRMP Area C) (P825), 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 Western Tasmania, Tas, 2001 (WTRMP Area C) survey were acquired in 2001 by the TAS Government, and consisted of 44149 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）数据用于测量地壳内成岩矿物含量差异所引发的地球磁场强度变化。根据岩石磁化率的不同，磁异常可分为正异常（磁场强度高于正常水平）与负异常（磁场强度低于正常水平）。该数据经标准流程处理，以确保记录的响应仅由地下岩石产生。处理后得到的数据集可用于解译地下地质构造。经澳大利亚地质调查局（Geoscience Australia, GA）的地球物理学家开展质量核查，确保GA发布的最终数据符合使用要求。本测线数据集源自2001年塔斯马尼亚州西部（WTRMP C区）航磁测量项目，由塔斯马尼亚州（TAS）政府于2001年采集，包含总长44149测线公里的数据，测线间距为200米，飞行离地高度为80米。为约束数据中的长波长分量，项目采用独立数据集——澳大利亚全国航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次航磁数据进行基线校正。本次航磁调查数据已基本校准至AWAGS基准水平。