RV Investigator Voyage IN2024_T01 Magnetic Data

Updated: 2026-11-05

This dataset contains processed and levelled marine magnetic data collected during the Marine National Facility (MNF) RV Investigator voyage IN2024_T01. The voyage occurred between 9 and 20 March 2024, travelling from Fremantle (WA) to Hobart (TAS) across the Great Australian Bight. Magnetic data were collected to investigate the geological structure of the southern Australian continental margin and continent-ocean transition. Marine magnetic data were acquired during seven magnetometer tows using a Marine Magnetics SeaSPY2 Overhauser magnetometer, deployed approximately 300 m behind the vessel. Measurements were recorded at a nominal sampling frequency of 1 Hz, providing an along-track spatial resolution of approximately 3-4 m. Post-voyage data processing was undertaken by Alan R. A. Aitken from the University of Western Australia using the semi-automated Python-based AIDMAP processing workflow. Processing included International Geomagnetic Reference Field (IGRF) correction, along-track despiking and filtering, correction for temporal magnetic field variations using INTERMAGNET observatory data, and median line levelling against existing marine magnetic observations from the Australian Marine Geodatabase. The final dataset is provided in CSV format and contains raw and processed total magnetic intensity (TMI) measurements in nanotesla (nT), geographic coordinates, acquisition date and time, along-track distance, and associated magnetic correction values. These data contribute to regional marine magnetic coverage of the Great Australian Bight and support investigations of crustal structure and the continent–ocean transition along Australia's southern continental margin.