Abstract
The transient electromagnetic method offers considerable advantages over conventional electromagnetic systems; these advantages make the method attractive under typical Australian conditions of conductive overburden. A common transient electromagnetic ground system used in Australia is a combined loop version in which the same loop is used for transmitting and receiving. This system employs a horizontal loop which is strongly coupled to horizontal conductors. By means of scale model studies and a field example it is shown that an alternative loop configuration is a system in which two adjacent loops are connected in parallel, the “dual loop” configuration. It provides improved detectability of a vertical or steeply dipping conductor. In addition, the dual loop configuration reduces electrical interferences. The main disadvantage of this configuration is the extra time required to lay out a dual loop.
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