b'Geophysics in the surveysNewsGeological Survey of South Australia: New state wide magnetic imagery and an update on the AusArray SA and Lake Eyre Basin passive seismic arraysNew state wide magnetic imageryThe geophysicists at the Geological Survey of South Australia have created new state wide magnetic imagery, incorporating the new Gawler Craton Airborne Survey (GCAS) data and other newly released public-domain survey data. This suite of images (Figure 1) represents the 2021 update to previous South Australian magnetic datasets and derivatives.Total Magnetic Intensity (TMI) is the magnitude of all magnetic influences measured at a point. The SA_TMI grid was produced by merging company and government survey grids within South Australia using Intrepid Software by Intrepid Geophysics. A series of geophysical products used in geological interpretation have been derived from SA_TMI also using Intrepid (see individual descriptions below).Data is provided in the ERMapper Raster (ERS) and georeferenced TIFF (GeoTIFF) image formats. ERS files are set in the SA Lambert projection with technical details in the accompanying ERS text file. Each grid has been gridded to a cell size of 80 m.The suite of grids include:SA_TMI, a total magnetic intensity grid of South Australia.SA_TMI_VRTP, a variable reduction to pole (RTP) grid of SA_TMI.SA_TMI_VRTP_1VD, the 1st Vertical Derivative of SA_TMI_VRTP.SA_TMI_VRTP_TILT, the TILT angle of the SA_TMI_VRTP.SA_TMI_VRTP_AS, the analytic signal of the SA_TMI_VRTP.SA_TMI_VRTP_AGC, the automatic gain control filter of the SA_TMI_VRTP.SA_TMI_VRTP_Tz, the vertical component of the SA_TMI_VRTP.SA_TMI_VRTP_Tzz, the vertical gradient of the SA_TMI_VRTP.SA_TMI_VRTP_Cauchy_3rd, a 3rd order derivative of the SA_TMI_VRTP.SA_TMI_VRTP_PseudoGravity, the pseudo gravity of the SA_TMI_VRTP.SA_TMI_VRTP_BigT, the amplitude of the total vector of the SA_TMI_VRTP. Figure 1.2021 State TMI and derivatives.SA_TMI_VRTP_BigE, a gradient of the magnetic strength in the SA_TMI_VRTP. TMI_AS: AS = (dt / dx ^ 2 + dt / dy ^All bodies with the same geometry will 2 + dt / dz ^ 2) have the same analytic signal (AS). The Some comments on individualpeaks of the analytic signal functions components are included below. Where t = the magnetic anomaly. are symmetrical and occur directly over 21 PREVIEW DECEMBER 2021'