Abstract:This imaging technique is used for approximate interpretation of TEM data including ungrounded loop source and grounded line source soundings.Loop source data can be collected as central-loop soundings or as out-of-loop soundings with a short or long offset configuration.The imaging method is based on the same princi- ple as that employed by Fullager(1989),with apparent resistivities computed directly from time-derivative data, db/d,and then associated with depths according to image theory.

Key words: TEM imaging; loop source date; apparent resistivity