Ground Penetrating Radar

Geophysics allows interpretation of the sub-surface of the Earth (and other planets) using indirect evidence. Geophysical analysis is conducted when you cannot get direct access to the rocks or do not wish to disturb what lies below. Geophysics uses the properties of rocks and soils to explore the Earth in ways the human senses cannot. One of the most commonly used geophysical methods is Ground Penetrating Radar (GPR), this is an electromagnetic method.
Bat echolocation. Bats use echolocation to help them “see” in the dark (Wikimedia Commons)
On a basic level, GPR surveys can be compared to echolocation used by bats and other animals. Bats create sound waves that then bounce off an object and are reflected back to them. The bat can tell how far away the object is by the amount of time it takes for the reflected sound to return. The intensity of the reflection can also give information about the type of surface it has hit (if it is firm or soft). This enables them to build up a picture …

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