Multi-source semi-airborne TEM is a supplement and development of electric source semi-airborne TEM. It has characteristics of great detective depth, strong adaptability in complex topography and high working efficiency. Based on the one-dimensional forward algorithm, the author analyzed the full-component response of parallel source and multi-source and single-source models. The results show that the curve of vertical component z is the simplest and it can be significantly strengthened with multi-source, which means this component is the most suitable one for data processing and interpretation. The most complex component is x. The curve always shows sign-changing in full field, but the magnitude can be strengthened in late stage. As the horizontal component y is most affected by current direction and receiver location, the curve shape and magnitude change are both complicated. Combined with the response characteristics of magnitude variation versus offset, it is suggested that the working area should be within the range of 5~6 times of source length. The research results in this paper can provide a reference for technical support to its application and obtain a preliminary understanding of the method.
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