A Quick Overview of Transient Electromagnetic Method (TEM) Working Principle

  The transient electromagnetic (TEM) method has been developed and re- fined most intensively since the mid-1980s. This makes the method relatively “young” compared to the frequency domain method, the magnetotelluric method and the geoelectric method. The reason is twofold: firstly the TEM response covers a very large dynamic range, which makes it difficult to measure without sophisticated electronics. Secondly, the interpretation of TEM data is approximately 50 - 100 times more computer intensive compared to interpretation of frequency and geoelectric data. Though, with modern computers the interpretation of TEM data can be done interactively, which was not possible 15-20 years ago when large computers were only available to research institutions and a few large companies.

  TEM has strong advantages that the output could be presented in several different formats for interpretation :