Geophysics

Scientists at Geoscience Australia use the following geophysical techniques:
 
Go to Electromagnetics pageElectromagnetics
Airborne Electromagnetic data are gathered by transmitting an electromagnetic signal from a system attached to a plane or helicopter. 
Go to Gravity pageGravity
The ability to measure small changes in gravity due to changes in the density of the rocks which make up the Earth provides a method which makes it possible to remotely map the distribution of different rock types and the structure of the rocks.
Go to Magnetics pageMagnetics
The magnetic method is a non-invasive geophysical method which ultimately measures the magnetic field associated with magnetic minerals in crustal rocks.
Go to Magneto-tellurics pageMagnetotellurics
Magnetotellurics (MT) is a passive geophysical method which uses natural time variations of the Earth’s magnetic and electric fields to measure the electrical resistivity of the sub-surface.
Go to Radiometrics pageRadiometrics
The radiometric, or gamma-ray spectrometric method is a geophysical process used to estimate concentrations of the radioelements potassium, uranium and thorium by measuring the gamma-rays which the radioactive isotopes of these elements emit during radioactive decay.
Link to Rock PropertiesRock Properties
Rock properties provide the vital link between observed geophysical data and interpreted geology. Geoscience Australia has periodically made measurements of rock properties to support various investigations into the composition and structure of the subsurface.
Go to Seismic pageSeismic
The seismic survey technique is the principal geophysical method used in Australia to acquire images of the Earth’s crust at depth which provides data on its structure and its resources. 

Topic contact: energy@ga.gov.au Last updated: May 31, 2012