Geophysical Data Packages

Geophysical data available includes data acquired during airborne geophysical surveys and ground based gravity surveys.

Airborne Geophysical Data

Airborne geophysical surveys have been flown in Victoria by GeoScience Victoria, Geoscience Australia and by private companies. The data acquired include:

Total magnetic intensity data - measures the earth's magnetic field. Local variations in the magnetic field are caused by near surface and/or deeper variations in the magnetic properties of the rocks. Interpretation of the data can provide information about the near surface and deeper geology and regional structural features. The data are used to assist with geological mapping and in mineral and petroleum exploration programs. Coverage is statewide at varying resolution.

Radiometric data - measures natural gamma radiation emanating from the earth's surface to a depth of about 30 cm. This gamma radiation is split into four channels - total radioelement count and three naturally occurring elements - potassium (K), thorium (Th) and uranium (U). The varying concentrations and distribution of radiometric potassium, thorium and uranium provide an indication of soil and rock characteristics. The data are used to assist with geological and soils mapping, mineral and petroleum exploration and land managment. Coverage is statewide at varying resolution.

Electromagnetic data - measures conductivity variations at shallow depth. A variety of transmitter / receiver configurations and performances are available, resulting in different depth penetration. The latest systems enable the production of high-resolution 3D sub-surface conductivity information to assist with ground water quality and salinity hazard assessment. The method is also a valuable tool for mineral exploration. Coverage is currently only over small test areas.

Digital terrain model data - measures changes in elevation of the earth's surface as derived from the difference between aircraft height above sea level and ground clearance. The data are used to define land forms and in assessing land stability, it is the primary dataset in all forms of land and catchment management and is also important to the exploration industry. State coverage of geophysical airborne survey derived DTM data is approximately 80%. This data is not as accurate as traditional surveying techniques.

An Airborne Geophysical Surveys Index is available to assist in locating these surveys and assessing the quality of the data.

Gravity Data

GeoScience Victoria has acquired over 62 700 gravity stations across Victoria since it started collecting gravity data in 1994 under the Victoria Initiative for Minerals and Petroleum program.

Gravity data - measures variations in the gravitational field of the earth. Local variations in the density of rocks near the surface cause minute changes in the gravity field. Interpretation of this data can provide information about the near surface and deeper geology and regional structural features. The data are used to assist with geological mapping and in mineral and petroleum exploration programs. Coverage is statewide at varying resolution.

Most Victorian geophysical data can be downloaded, free of charge, from GADDS.

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