Abstract：Research purposes: With the rapid railway construction，more and more railway lines pass through the hill and mountain areas in recent years． the limitations of the conventional geophysical methods are more and more obvious when they are used for the fault structure exploration for railway． The research is done on the data processing and interpretation of the natural source audio frequency magnetollurics for the fault structure exploration for the purpose of improving the accuracy of fault structure survey and basically having no limitation in the faut structure survey．
Research conclusions: In the fault structure exploration for railway，compared with the conventional geophysical methods，the natural source audio frequency magnetotellurics has the features of the rapid survey with less topographical limitation，big survey depth and low cost． With the self － developed data processing methods，the same platform can be used for processing the data of the natural source audio frequency magnetollurics and CSAMT to solve the defect that the inversion is too smooth and abnormal homogenization，getting good survey effect on the fault structure exploration and finding out the distribution pattern of fault structure． It provides a strong basis for the railway alignment and guiding significance to the similar works．
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2011, Vol. 28 
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