b'Geophysics in the surveysNewsGeological Survey of South Australia: An update to the South Australian gravity moduleGravity survey data in South AustraliaNote that the gravity module uses GDA94Referencesare stored in an Oracle database. The(not AGD66) latitudes in this second minimum amount of data that can beequation. Note also that these equationsBlakely, R.J. 1995. Potential theory in uploaded are some location informationare not using the AAGD07 gravity datum,gravity and magnetic applications. (typically a latitude and longitude), theellipsoidal heights, or a spherical capCambridge University Press.observed gravity (in either the IsoGal67Bouguer calculation. Kearey, P., M. Brooks, and I. Hill. 1984. An or 84 datum), and a height (AHD only).introduction to geophysical exploration. The database takes this information It is time for an upgrade, and geophysicists along with a crustal density defined by aat the Geological Survey of South Australia3rd ed. Blackwell Publishing.userto calculate a Bouguer Anomaly.are exploring how to upgrade the gravityKuhn, M., W.E. Featherstone, and J.F. This Bouguer Anomaly is based on themodule. Kirby. 2009. Complete spherical Bouguer simple slab model, using AHD heightsThe database will need to be populatedgravity anomalies over Australia. and the Kearey, Brooks, and Hill (1984)with ellipsoidal heights, in addition weAustralian Journal of Earth Sciences 56: theoretical gravity equation. Thewill need to populate the database with213223.equation can be written: observed gravity in the AAGD07 datum,Reynolds, J.M. 1997. An introduction to g b(1984)= obs g(1984) 978031.8(1 +update the theoretical gravity equationapplied and environmental geophysics. 0.0053024sin2 0.0000059sin22) +to a more modern formulation (e.g.,John Wiley & Sons.(0.04191*h*) + (0.3086*h) from Blakely 1995), and incorporate the spherical cap equations as perSheriff, R.E. 1991. Encyclopedic dictionary Whereis the latitude (in GDA94),is theKuhn, Featherstone, and Kirby (2009).of applied geophysics. 4th ed. The Society crustal density, and h is the AHD height.We anticipate we will retain the slabof Exploration Geophysicists.The gravity module also calculates themodel Bouguer Anomaly values for Bouguer Anomaly for the 1967 gravitycompleteness.datum. This process is similar to theWe dont yet have an anticipated release previous method, but uses a differentdate for the new and improved gravity equation for the theoretical gravity (Sheriffmodule, but stay tuned to Preview for 1991; Blakely 1995; Reynolds 1997): future announcements.g b(1967)= obs g(1967) 978049(1 + 0.0052884sin2 0.0000059sin22) +Philip Heath (0.04191*h*) + (0.3086*h) Philip.heath@sa.gov.auPhilip Heath and Christie Gerrard at the GSSA booth at AEGC 2019. Photo taken by David Broadway21 PREVIEW OCTOBER 2019'