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Airborne Gravity Survey

View of land from the sky.

The survey will commence in August 2018.

Geoscience takes to south-west skies

The Geological Survey of Victoria (GSV) is conducting an airborne gravity survey across approximately 16,000 km2 of south west Victoria to measure extremely small variations in the Earth’s natural gravity field.

The survey will help inform the Victorian Gas Program’s (VGP) scientific research into potential new onshore conventional gas and offshore gas resources in the region.

GSV routinely conducts geoscientific research to better understand Victoria’s geology and State-owned Earth resources.

The survey will commence in August 2018 and is expected to take approximately 12 weeks. It will be carried out by two small, fixed wing aircraft carrying state-of-the-art technology designed to record gravitational variations while operating in a moving aircraft.

For more detailed information, please see our Frequently Asked Questions.

An airborne gravity survey plane.

One of the planes that will conduct the survey.

The planes will fly at an altitude of 150 metres, increasing to 300 meters in built-up areas. The survey’s flight lines will be spaced 500m apart in a NW-SE orientation.

In most instances, the plane will only need to fly over a location once.

The survey area includes the local government areas of Colac Otway, Corangamite, Moyne, Warrnambool, Southern Grampians and Glenelg; stretching from the edge of the Otway Ranges to the South Australian border, and from the south of the Grampians to approximately 18 km offshore.

Map of Victoria showing the survey area. The area includes Portland, Warrnambool, Port Campbell and is bordered by Camperdown, Hamilton and Casterton.

Map showing the survey area.

The data collected from this survey will be used by GSV geologists to map sub surface geological structures and help refine geological models of the region (offshore, nearshore and onshore Otway Basin).

The models are a key tool to help inform future approaches to managing our natural gas resources.

Following processing of the raw airborne gravity data, the survey results will be freely available on the VGP website.

The survey will be conducted by CGG Aviation (Australia) Pty Ltd on behalf of the State of Victoria.

This webpage will be updated as the survey commences.

Further inquiries can directed to vgp@ecodev.vic.gov.au.