b'Geophysics in the surveysNewsGeological Survey of Victoria: Update on progress of airborne and ground gravity surveysAirborne gravity survey update and release of preliminary gridsThe Geological Survey of Victoria (part of the Department of Energy, Environment and Climate Action), the Surveyor-General Victoria (part of the Department of Transport and Planning) and Geoscience Australia (GA) have been working with Sander Geophysics Ltd to collect airborne gravity data across Greater Melbourne and eastern Victoria including coastal and alpine areas (Figure 1). The objective of the project is to collect consistent and evenly distributed gravity measurements to improve height determination from GPS positioning and advance the understanding of Victorias geological architecture and earth resource potential. Figure 1.Map showing the location of the Greater Melbourne and eastern Victoria airborne gravity survey with preliminary Bouguer gravity grids. and the location of the Shepparton-Numurkah regional The survey has now extended beyondground gravity survey.50% completion (see progress map on the project website - https://www.land.vic.gov.au/surveying/projects-and-initiatives/airborne-gravity-survey).The project partners are releasing preliminary grids of the first stage of the project (see Figure 1). The first stage of the project was flown with a single-engine aircraft at 1 km line spacing over the Hume, Otway and West Gippsland regions. The preliminary grids of free air gravity, Bouguer gravity and first vertical derivative of Bouguer gravity have been prepared using a 6-km full wavelengthFigure 2.Photos of Daishsats gravity crew observing gravity on the roadside. Credit: Daishsat Geodetic filter. Surveyors.The grids will be available for downloadGeodetic Surveys to acquire groundroads to rural and dual-lane highway from the Geological Survey of Victoriasgravity observations across theto suburban streets. Daishsat have online catalogue at www.gsv.vic.gov. Victorian Riverine Plain betweendeveloped detailed traffic management au/rid/171723. If you wish to be notifiedSeymour, Echuca and Wodongaplans and procedures to ensure the when the grids become available, please(Figure1). Comprising approximatelysafety of the surveyors and other road email gsv_info@ecodev.vic.gov.au to20 000 new stations, the survey willusers (see Figure 2)record your interest. infill the existing gravity coverage to around 500 m along public roads andSee here for more information A final data package of located data,tracks. The survey began in August 2023and a printable fact sheet https://grids and an operations report will beand is making good progress, despiteearthresources.vic.gov.au/projects/available at conclusion of the project. recent wet ground conditions andeastern-victoria-geoscience-initiative/ongoing repairs to regional roads andshepparton-numurkah-regional-ground-Ground gravity survey begins ininfrastructure, damaged after the majorgravity-survey.northern Victoria 2022 flooding event.Suzanne Haydon The Geological Survey of VictoriaThe survey covers a wide variety of roadGeological Survey of Victoria has partnered with GA and Daishsattypes from bush tracks and unusedSuzanne.Haydon@ecodev.vic.gov.au21 PREVIEW OCTOBER 2023'