East Pilbara, WA, 1996 (P656), 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 East Pilbara, WA, 1996 survey were acquired in 1996 by the WA Government, and consisted of 34340 line-kilometres of data at 400m 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.

总磁强度（Total Magnetic Intensity, TMI）数据用于量化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），其极性取决于岩石的磁化率。研究人员通过标准处理流程对数据进行处理，以确保所记录的磁场响应仅源于地下岩石。经处理得到的数据集可通过解译揭示地下地质结构。GA地球物理学家将对处理后的数据开展质量核查，以确保GA发布的最终数据符合使用要求。本次1996年西澳大利亚州（Western Australia, WA）东皮尔巴拉地区航空磁测所用的测线数据集由西澳大利亚州政府于1996年采集完成，数据总长度达34340测线千米，测线间距为400米，航空观测离地高度为80米。为约束数据中的长波长分量，研究人员采用独立数据集——全澳大利亚航空地球物理调查（Australia-wide Airborne Geophysical Survey, AWAGS）航空磁测数据——对本次勘测数据的基准水平进行校正。本次勘测数据实质上已依据AWAGS数据集完成平差处理。