大地电磁法由于天然场源信号的微弱性和随机性，在野外记录和数据采集方面需要花费巨大的努力。
Due to the weakness and randomness of natural source in magnetotelluric method, a great deal of effort is spent in the field records and data acquisition.
大地电磁测深法(MT)是以天然电磁场为场源研究地球内部电性结构的一种重要的地球物理手段。
Magnetotelluric (MT) sounding is an important geophysical means to study the Earth electrical structure using the natural EM field as its source.
利用天然电磁波场源进行地球物理勘探的SYT法，多年来一直应用在煤炭、石油、水利、工程领域。
SYT method using natural electromagnetic wave method in geophysical exploration has been used for many years in fields of coal, petroleum, water conservation and engineering.
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