6.9 Looking Inside the Earth (Chapter 6: Earth's Structure: Direct and Indirect Evidence)
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Course
AS Unit F791 - Global Tectonics
Institution
OCR
This document contains detailed notes on Looking Inside the Earth from Chapter 6: Earth's Structure: Direct and Indirect Evidence of the A Level Geology course. It includes all the information required to secure a top grade in this part of the course. These notes took me many hours to complete and ...
, Electromagnetic Surveys
• Electromagnetic surveys work like transformers, as follows:
Alternating current is passed through the primary, transmitting coil.
A magnetic field is induced which spreads into the ground.
The magnetic field induces a secondary current in any underground
material which acts as a conductor, eg: water/iron-bearing minerals.
The current sets up an alternating secondary magnetic field.
This field is detected by the secondary, receiving coil and the
information is sent to a data logger.
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